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modeling_qwen3_vl.py

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+#                🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨
+#           This file was automatically generated from src/transformers/models/qwen3_vl/modular_qwen3_vl.py.
+#               Do NOT edit this file manually as any edits will be overwritten by the generation of
+#             the file from the modular. If any change should be done, please apply the change to the
+#                          modular_qwen3_vl.py file directly. One of our CI enforces this.
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+# coding=utf-8
+# Copyright 2025 The Qwen Team and The HuggingFace Inc. team. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from dataclasses import dataclass
+from typing import Any, Callable, Optional, Union, Dict
+import gc
+import math
+
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+import torch.distributed as dist
+
+from transformers.activations import ACT2FN
+from transformers.cache_utils import Cache, DynamicCache
+from transformers.generation import GenerationMixin
+from transformers.integrations import use_kernel_forward_from_hub
+from transformers.masking_utils import create_causal_mask
+from transformers.modeling_flash_attention_utils import FlashAttentionKwargs
+from transformers.modeling_layers import GradientCheckpointingLayer
+from transformers.modeling_outputs import BaseModelOutputWithPast, ModelOutput
+from transformers.modeling_rope_utils import ROPE_INIT_FUNCTIONS, dynamic_rope_update
+from transformers.modeling_utils import ALL_ATTENTION_FUNCTIONS, PreTrainedModel
+from transformers.processing_utils import Unpack
+from transformers.utils import TransformersKwargs, auto_docstring, is_torchdynamo_compiling
+from transformers.utils.deprecation import deprecate_kwarg
+from transformers.utils.generic import check_model_inputs
+from qwenvl.model.configuration_qwen3_vl import Qwen3VLConfig, Qwen3VLTextConfig, Qwen3VLVisionConfig
+from liger_kernel.transformers.model.loss_utils import LigerForCausalLMLoss
+from qwenvl.model.modeling_whisper import WhisperEncoder
+from qwenvl.model.ttt.ttt_layer import TTTWrapper, SSMGating
+from qwenvl.model.ttt.configs import ModelConfig as TTTModelConfig
+
+class Qwen3VLVisionMLP(nn.Module):
+    def __init__(self, config):
+        super().__init__()
+        self.hidden_size = config.hidden_size
+        self.intermediate_size = config.intermediate_size
+        self.linear_fc1 = nn.Linear(self.hidden_size, self.intermediate_size, bias=True)
+        self.linear_fc2 = nn.Linear(self.intermediate_size, self.hidden_size, bias=True)
+        self.act_fn = ACT2FN[config.hidden_act]
+
+    def forward(self, hidden_state):
+        return self.linear_fc2(self.act_fn(self.linear_fc1(hidden_state)))
+
+
+class Qwen3VLVisionPatchEmbed(nn.Module):
+    def __init__(self, config) -> None:
+        super().__init__()
+        self.patch_size = config.patch_size
+        self.temporal_patch_size = config.temporal_patch_size
+        self.in_channels = config.in_channels
+        self.embed_dim = config.hidden_size
+
+        kernel_size = [self.temporal_patch_size, self.patch_size, self.patch_size]
+        self.proj = nn.Conv3d(self.in_channels, self.embed_dim, kernel_size=kernel_size, stride=kernel_size, bias=True)
+
+    def forward(self, hidden_states: torch.Tensor) -> torch.Tensor:
+        target_dtype = self.proj.weight.dtype
+        hidden_states = hidden_states.view(
+            -1, self.in_channels, self.temporal_patch_size, self.patch_size, self.patch_size
+        )
+        hidden_states = self.proj(hidden_states.to(dtype=target_dtype)).view(-1, self.embed_dim)
+        return hidden_states
+
+
+class Qwen3VLVisionRotaryEmbedding(nn.Module):
+    inv_freq: torch.Tensor  # fix linting for `register_buffer`
+
+    def __init__(self, dim: int, theta: float = 10000.0) -> None:
+        super().__init__()
+        inv_freq = 1.0 / (theta ** (torch.arange(0, dim, 2, dtype=torch.float) / dim))
+        self.register_buffer("inv_freq", inv_freq, persistent=False)
+
+    def forward(self, seqlen: int) -> torch.Tensor:
+        seq = torch.arange(seqlen, device=self.inv_freq.device, dtype=self.inv_freq.dtype)
+        freqs = torch.outer(seq, self.inv_freq)
+        return freqs
+
+
+class Qwen3VLVisionPatchMerger(nn.Module):
+    def __init__(self, config: Qwen3VLVisionConfig, use_postshuffle_norm=False) -> None:
+        super().__init__()
+        self.hidden_size = config.hidden_size * (config.spatial_merge_size**2)
+        self.use_postshuffle_norm = use_postshuffle_norm
+        self.norm = nn.LayerNorm(self.hidden_size if use_postshuffle_norm else config.hidden_size, eps=1e-6)
+        self.linear_fc1 = nn.Linear(self.hidden_size, self.hidden_size)
+        self.act_fn = nn.GELU()
+        self.linear_fc2 = nn.Linear(self.hidden_size, config.out_hidden_size)
+
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        x = self.norm(x.view(-1, self.hidden_size) if self.use_postshuffle_norm else x).view(-1, self.hidden_size)
+        x = self.linear_fc2(self.act_fn(self.linear_fc1(x)))
+        return x
+
+
+def rotate_half(x):
+    """Rotates half the hidden dims of the input."""
+    x1 = x[..., : x.shape[-1] // 2]
+    x2 = x[..., x.shape[-1] // 2 :]
+    return torch.cat((-x2, x1), dim=-1)
+
+
+def apply_rotary_pos_emb_vision(
+    q: torch.Tensor, k: torch.Tensor, cos: torch.Tensor, sin: torch.Tensor
+) -> tuple[torch.Tensor, torch.Tensor]:
+    orig_q_dtype = q.dtype
+    orig_k_dtype = k.dtype
+    q, k = q.float(), k.float()
+    cos, sin = cos.unsqueeze(-2).float(), sin.unsqueeze(-2).float()
+    q_embed = (q * cos) + (rotate_half(q) * sin)
+    k_embed = (k * cos) + (rotate_half(k) * sin)
+    q_embed = q_embed.to(orig_q_dtype)
+    k_embed = k_embed.to(orig_k_dtype)
+    return q_embed, k_embed
+
+
+def repeat_kv(hidden_states: torch.Tensor, n_rep: int) -> torch.Tensor:
+    """
+    This is the equivalent of torch.repeat_interleave(x, dim=1, repeats=n_rep). The hidden states go from (batch,
+    num_key_value_heads, seqlen, head_dim) to (batch, num_attention_heads, seqlen, head_dim)
+    """
+    batch, num_key_value_heads, slen, head_dim = hidden_states.shape
+    if n_rep == 1:
+        return hidden_states
+    hidden_states = hidden_states[:, :, None, :, :].expand(batch, num_key_value_heads, n_rep, slen, head_dim)
+    return hidden_states.reshape(batch, num_key_value_heads * n_rep, slen, head_dim)
+
+
+def eager_attention_forward(
+    module: nn.Module,
+    query: torch.Tensor,
+    key: torch.Tensor,
+    value: torch.Tensor,
+    attention_mask: Optional[torch.Tensor],
+    scaling: float,
+    dropout: float = 0.0,
+    **kwargs: Unpack[TransformersKwargs],
+):
+    key_states = repeat_kv(key, module.num_key_value_groups)
+    value_states = repeat_kv(value, module.num_key_value_groups)
+
+    attn_weights = torch.matmul(query, key_states.transpose(2, 3)) * scaling
+    if attention_mask is not None:
+        causal_mask = attention_mask[:, :, :, : key_states.shape[-2]]
+        attn_weights = attn_weights + causal_mask
+
+    attn_weights = nn.functional.softmax(attn_weights, dim=-1, dtype=torch.float32).to(query.dtype)
+    attn_weights = nn.functional.dropout(attn_weights, p=dropout, training=module.training)
+    attn_output = torch.matmul(attn_weights, value_states)
+    attn_output = attn_output.transpose(1, 2).contiguous()
+
+    return attn_output, attn_weights
+
+
+class Qwen3VLVisionAttention(nn.Module):
+    def __init__(self, config: Qwen3VLVisionConfig) -> None:
+        super().__init__()
+        self.dim = config.hidden_size
+        self.num_heads = config.num_heads
+        self.head_dim = self.dim // self.num_heads
+        self.num_key_value_groups = 1  # needed for eager attention
+        self.qkv = nn.Linear(self.dim, self.dim * 3, bias=True)
+        self.proj = nn.Linear(self.dim, self.dim)
+        self.scaling = self.head_dim**-0.5
+        self.config = config
+        self.attention_dropout = 0.0
+        self.is_causal = False
+
+    def forward(
+        self,
+        hidden_states: torch.Tensor,
+        cu_seqlens: torch.Tensor,
+        rotary_pos_emb: Optional[torch.Tensor] = None,
+        position_embeddings: Optional[tuple[torch.Tensor, torch.Tensor]] = None,
+        **kwargs,
+    ) -> torch.Tensor:
+        seq_length = hidden_states.shape[0]
+        query_states, key_states, value_states = (
+            self.qkv(hidden_states).reshape(seq_length, 3, self.num_heads, -1).permute(1, 0, 2, 3).unbind(0)
+        )
+        cos, sin = position_embeddings
+        query_states, key_states = apply_rotary_pos_emb_vision(query_states, key_states, cos, sin)
+
+        query_states = query_states.transpose(0, 1).unsqueeze(0)
+        key_states = key_states.transpose(0, 1).unsqueeze(0)
+        value_states = value_states.transpose(0, 1).unsqueeze(0)
+
+        attention_interface: Callable = eager_attention_forward
+        if self.config._attn_implementation != "eager":
+            attention_interface = ALL_ATTENTION_FUNCTIONS[self.config._attn_implementation]
+
+        if self.config._attn_implementation == "flash_attention_2":
+            # Flash Attention 2: Use cu_seqlens for variable length attention
+            max_seqlen = (cu_seqlens[1:] - cu_seqlens[:-1]).max()
+            attn_output, _ = attention_interface(
+                self,
+                query_states,
+                key_states,
+                value_states,
+                attention_mask=None,
+                scaling=self.scaling,
+                dropout=0.0 if not self.training else self.attention_dropout,
+                cu_seq_lens_q=cu_seqlens,
+                cu_seq_lens_k=cu_seqlens,
+                max_length_q=max_seqlen,
+                max_length_k=max_seqlen,
+                is_causal=False,
+                **kwargs,
+            )
+        else:
+            # Other implementations: Process each chunk separately
+            lengths = cu_seqlens[1:] - cu_seqlens[:-1]
+            splits = [
+                torch.split(tensor, lengths.tolist(), dim=2) for tensor in (query_states, key_states, value_states)
+            ]
+
+            attn_outputs = [
+                attention_interface(
+                    self,
+                    q,
+                    k,
+                    v,
+                    attention_mask=None,
+                    scaling=self.scaling,
+                    dropout=0.0 if not self.training else self.attention_dropout,
+                    is_causal=False,
+                    **kwargs,
+                )[0]
+                for q, k, v in zip(*splits)
+            ]
+            attn_output = torch.cat(attn_outputs, dim=1)
+
+        attn_output = attn_output.reshape(seq_length, -1).contiguous()
+        attn_output = self.proj(attn_output)
+        return attn_output
+
+
+class Qwen3VLVisionBlock(GradientCheckpointingLayer):
+    def __init__(self, config, attn_implementation: str = "sdpa") -> None:
+        super().__init__()
+        self.norm1 = nn.LayerNorm(config.hidden_size, eps=1e-6)
+        self.norm2 = nn.LayerNorm(config.hidden_size, eps=1e-6)
+        self.attn = Qwen3VLVisionAttention(config=config)
+        self.mlp = Qwen3VLVisionMLP(config=config)
+
+    def forward(
+        self,
+        hidden_states: torch.Tensor,
+        cu_seqlens: torch.Tensor,
+        rotary_pos_emb: Optional[torch.Tensor] = None,
+        position_embeddings: Optional[tuple[torch.Tensor, torch.Tensor]] = None,
+        **kwargs,
+    ) -> torch.Tensor:
+        hidden_states = hidden_states + self.attn(
+            self.norm1(hidden_states),
+            cu_seqlens=cu_seqlens,
+            rotary_pos_emb=rotary_pos_emb,
+            position_embeddings=position_embeddings,
+            **kwargs,
+        )
+        hidden_states = hidden_states + self.mlp(self.norm2(hidden_states))
+        return hidden_states
+
+
+class Qwen3VLTextRotaryEmbedding(nn.Module):
+    inv_freq: torch.Tensor  # fix linting for `register_buffer`
+
+    def __init__(self, config: Qwen3VLTextConfig, device=None):
+        super().__init__()
+        if hasattr(config, "rope_scaling") and config.rope_scaling is not None:
+            self.rope_type = config.rope_scaling.get("rope_type", "default")
+        else:
+            self.rope_type = "default"
+        self.max_seq_len_cached = config.max_position_embeddings
+        self.original_max_seq_len = config.max_position_embeddings
+
+        self.config = config
+        self.rope_init_fn = ROPE_INIT_FUNCTIONS[self.rope_type]
+
+        inv_freq, self.attention_scaling = self.rope_init_fn(self.config, device)
+        self.register_buffer("inv_freq", inv_freq, persistent=False)
+        self.original_inv_freq = self.inv_freq
+
+        self.mrope_section = config.rope_scaling.get("mrope_section", [24, 20, 20])
+
+    def apply_interleaved_mrope(self, freqs, mrope_section):
+        """Apply interleaved MRoPE to 3D rotary embeddings.
+        Reorganizes frequency layout from chunked [TTT...HHH...WWW] to
+        interleaved [THTHWHTHW...TT], preserving frequency continuity.
+        args:
+            x: (3, bs, seq_len, head_dim // 2)
+            mrope_section: (3,)
+        returns:
+            x_t: (bs, seq_len, head_dim // 2)
+        """
+        freqs_t = freqs[0]  # just overwrite the first dimension T
+        for dim, offset in enumerate((1, 2), start=1):  # H, W
+            length = mrope_section[dim] * 3
+            idx = slice(offset, length, 3)
+            freqs_t[..., idx] = freqs[dim, ..., idx]
+        return freqs_t
+
+    @torch.no_grad()
+    @dynamic_rope_update  # power user: used with advanced RoPE types (e.g. dynamic rope)
+    def forward(self, x, position_ids):
+        # In contrast to other models, Qwen3VL has different position ids for the grids
+        # So we expand the inv_freq to shape (3, ...)
+        if position_ids.ndim == 2:
+            position_ids = position_ids[None, ...].expand(3, position_ids.shape[0], -1)
+        inv_freq_expanded = self.inv_freq[None, None, :, None].float().expand(3, position_ids.shape[1], -1, 1)
+        position_ids_expanded = position_ids[:, :, None, :].float()  # shape (3, bs, 1, positions)
+
+        device_type = x.device.type if isinstance(x.device.type, str) and x.device.type != "mps" else "cpu"
+        with torch.autocast(device_type=device_type, enabled=False):  # Force float32
+            freqs = (inv_freq_expanded.float() @ position_ids_expanded.float()).transpose(2, 3)
+            freqs = self.apply_interleaved_mrope(freqs, self.mrope_section)
+            emb = torch.cat((freqs, freqs), dim=-1)
+            cos = emb.cos() * self.attention_scaling
+            sin = emb.sin() * self.attention_scaling
+
+        return cos.to(dtype=x.dtype), sin.to(dtype=x.dtype)
+
+
+@use_kernel_forward_from_hub("RMSNorm")
+class Qwen3VLTextRMSNorm(nn.Module):
+    def __init__(self, hidden_size, eps: float = 1e-6) -> None:
+        """
+        Qwen3VLTextRMSNorm is equivalent to T5LayerNorm
+        """
+        super().__init__()
+        self.weight = nn.Parameter(torch.ones(hidden_size))
+        self.variance_epsilon = eps
+
+    def forward(self, hidden_states: torch.Tensor) -> torch.Tensor:
+        input_dtype = hidden_states.dtype
+        hidden_states = hidden_states.to(torch.float32)
+        variance = hidden_states.pow(2).mean(-1, keepdim=True)
+        hidden_states = hidden_states * torch.rsqrt(variance + self.variance_epsilon)
+        return self.weight * hidden_states.to(input_dtype)
+
+    def extra_repr(self):
+        return f"{tuple(self.weight.shape)}, eps={self.variance_epsilon}"
+
+
+def apply_rotary_pos_emb(q, k, cos, sin, position_ids=None, unsqueeze_dim=1):
+    """Applies Rotary Position Embedding to the query and key tensors.
+
+    Args:
+        q (`torch.Tensor`): The query tensor.
+        k (`torch.Tensor`): The key tensor.
+        cos (`torch.Tensor`): The cosine part of the rotary embedding.
+        sin (`torch.Tensor`): The sine part of the rotary embedding.
+        position_ids (`torch.Tensor`, *optional*):
+            Deprecated and unused.
+        unsqueeze_dim (`int`, *optional*, defaults to 1):
+            The 'unsqueeze_dim' argument specifies the dimension along which to unsqueeze cos[position_ids] and
+            sin[position_ids] so that they can be properly broadcasted to the dimensions of q and k. For example, note
+            that cos[position_ids] and sin[position_ids] have the shape [batch_size, seq_len, head_dim]. Then, if q and
+            k have the shape [batch_size, heads, seq_len, head_dim], then setting unsqueeze_dim=1 makes
+            cos[position_ids] and sin[position_ids] broadcastable to the shapes of q and k. Similarly, if q and k have
+            the shape [batch_size, seq_len, heads, head_dim], then set unsqueeze_dim=2.
+    Returns:
+        `tuple(torch.Tensor)` comprising of the query and key tensors rotated using the Rotary Position Embedding.
+    """
+    cos = cos.unsqueeze(unsqueeze_dim)
+    sin = sin.unsqueeze(unsqueeze_dim)
+    q_embed = (q * cos) + (rotate_half(q) * sin)
+    k_embed = (k * cos) + (rotate_half(k) * sin)
+    return q_embed, k_embed
+
+
+class Qwen3VLTextAttention(nn.Module):
+    """Multi-headed attention from 'Attention Is All You Need' paper"""
+
+    def __init__(self, config: Qwen3VLTextConfig, layer_idx: int):
+        super().__init__()
+        self.config = config
+        self.layer_idx = layer_idx
+        self.head_dim = getattr(config, "head_dim", config.hidden_size // config.num_attention_heads)
+        self.num_key_value_groups = config.num_attention_heads // config.num_key_value_heads
+        self.scaling = self.head_dim**-0.5
+        self.attention_dropout = config.attention_dropout
+        self.is_causal = True
+
+        self.q_proj = nn.Linear(
+            config.hidden_size, config.num_attention_heads * self.head_dim, bias=config.attention_bias
+        )
+        self.k_proj = nn.Linear(
+            config.hidden_size, config.num_key_value_heads * self.head_dim, bias=config.attention_bias
+        )
+        self.v_proj = nn.Linear(
+            config.hidden_size, config.num_key_value_heads * self.head_dim, bias=config.attention_bias
+        )
+        self.o_proj = nn.Linear(
+            config.num_attention_heads * self.head_dim, config.hidden_size, bias=config.attention_bias
+        )
+        self.q_norm = Qwen3VLTextRMSNorm(self.head_dim, eps=config.rms_norm_eps)  # unlike olmo, only on the head dim!
+        self.k_norm = Qwen3VLTextRMSNorm(
+            self.head_dim, eps=config.rms_norm_eps
+        )  # thus post q_norm does not need reshape
+
+    @deprecate_kwarg("past_key_value", new_name="past_key_values", version="4.58")
+    def forward(
+        self,
+        hidden_states: torch.Tensor,
+        position_embeddings: tuple[torch.Tensor, torch.Tensor],
+        attention_mask: Optional[torch.Tensor],
+        past_key_values: Optional[Cache] = None,
+        cache_position: Optional[torch.LongTensor] = None,
+        **kwargs: Unpack[FlashAttentionKwargs],
+    ) -> tuple[torch.Tensor, Optional[torch.Tensor]]:
+        input_shape = hidden_states.shape[:-1]
+        hidden_shape = (*input_shape, -1, self.head_dim)
+
+        query_states = self.q_norm(self.q_proj(hidden_states).view(hidden_shape)).transpose(1, 2)
+        key_states = self.k_norm(self.k_proj(hidden_states).view(hidden_shape)).transpose(1, 2)
+        value_states = self.v_proj(hidden_states).view(hidden_shape).transpose(1, 2)
+
+        cos, sin = position_embeddings
+        query_states, key_states = apply_rotary_pos_emb(query_states, key_states, cos, sin)
+
+        if past_key_values is not None:
+            # sin and cos are specific to RoPE models; cache_position needed for the static cache
+            cache_kwargs = {"sin": sin, "cos": cos, "cache_position": cache_position}
+            key_states, value_states = past_key_values.update(key_states, value_states, self.layer_idx, cache_kwargs)
+
+        attention_interface: Callable = eager_attention_forward
+        if self.config._attn_implementation != "eager":
+            attention_interface = ALL_ATTENTION_FUNCTIONS[self.config._attn_implementation]
+
+        attn_output, attn_weights = attention_interface(
+            self,
+            query_states,
+            key_states,
+            value_states,
+            attention_mask,
+            dropout=0.0 if not self.training else self.attention_dropout,
+            scaling=self.scaling,
+            **kwargs,
+        )
+
+        attn_output = attn_output.reshape(*input_shape, -1).contiguous()
+        attn_output = self.o_proj(attn_output)
+        return attn_output, attn_weights
+
+
+class Qwen3VLTextMLP(nn.Module):
+    def __init__(self, config):
+        super().__init__()
+        self.config = config
+        self.hidden_size = config.hidden_size
+        self.intermediate_size = config.intermediate_size
+        self.gate_proj = nn.Linear(self.hidden_size, self.intermediate_size, bias=False)
+        self.up_proj = nn.Linear(self.hidden_size, self.intermediate_size, bias=False)
+        self.down_proj = nn.Linear(self.intermediate_size, self.hidden_size, bias=False)
+        self.act_fn = ACT2FN[config.hidden_act]
+
+    def forward(self, x):
+        down_proj = self.down_proj(self.act_fn(self.gate_proj(x)) * self.up_proj(x))
+        return down_proj
+
+
+class Qwen3VLTextDecoderLayer(GradientCheckpointingLayer):
+    def __init__(self, config: Qwen3VLTextConfig, layer_idx: int):
+        super().__init__()
+        self.hidden_size = config.hidden_size
+
+        self.self_attn = Qwen3VLTextAttention(config=config, layer_idx=layer_idx)
+
+        self.mlp = Qwen3VLTextMLP(config)
+        self.input_layernorm = Qwen3VLTextRMSNorm(config.hidden_size, eps=config.rms_norm_eps)
+        self.post_attention_layernorm = Qwen3VLTextRMSNorm(config.hidden_size, eps=config.rms_norm_eps)
+
+    @deprecate_kwarg("past_key_value", new_name="past_key_values", version="4.58")
+    def forward(
+        self,
+        hidden_states: torch.Tensor,
+        position_embeddings: tuple[torch.Tensor, torch.Tensor],
+        attention_mask: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.LongTensor] = None,
+        past_key_values: Optional[Cache] = None,
+        use_cache: Optional[bool] = False,
+        cache_position: Optional[torch.LongTensor] = None,
+        **kwargs: Unpack[TransformersKwargs],
+    ) -> torch.Tensor:
+        residual = hidden_states
+        hidden_states = self.input_layernorm(hidden_states)
+        # Self Attention
+        hidden_states, _ = self.self_attn(
+            hidden_states=hidden_states,
+            attention_mask=attention_mask,
+            position_ids=position_ids,
+            past_key_values=past_key_values,
+            use_cache=use_cache,
+            cache_position=cache_position,
+            position_embeddings=position_embeddings,
+            **kwargs,
+        )
+        hidden_states = residual + hidden_states
+
+        # Fully Connected
+        residual = hidden_states
+        hidden_states = self.post_attention_layernorm(hidden_states)
+        hidden_states = self.mlp(hidden_states)
+        hidden_states = residual + hidden_states
+        return hidden_states
+
+
+@dataclass
+@auto_docstring(
+    custom_intro="""
+    Base class for Llava outputs, with hidden states and attentions.
+    """
+)
+class Qwen3VLModelOutputWithPast(ModelOutput):
+    r"""
+    past_key_values (`Cache`, *optional*, returned when `use_cache=True` is passed or when `config.use_cache=True`):
+        It is a [`~cache_utils.Cache`] instance. For more details, see our [kv cache guide](https://huggingface.co/docs/transformers/en/kv_cache).
+
+        Contains pre-computed hidden-states (key and values in the self-attention blocks) that can be used (see
+        `past_key_values` input) to speed up sequential decoding.
+    rope_deltas (`torch.LongTensor` of shape `(batch_size, )`, *optional*):
+        The rope index difference between sequence length and multimodal rope.
+    """
+
+    last_hidden_state: Optional[torch.FloatTensor] = None
+    past_key_values: Optional[Cache] = None
+    hidden_states: Optional[tuple[torch.FloatTensor]] = None
+    attentions: Optional[tuple[torch.FloatTensor]] = None
+    rope_deltas: Optional[torch.LongTensor] = None
+    labels: Optional[torch.LongTensor] = None
+    memory_triplets: Optional[dict] = None
+
+
+@auto_docstring
+class Qwen3VLPreTrainedModel(PreTrainedModel):
+    config: Qwen3VLConfig
+    base_model_prefix = "model"
+    supports_gradient_checkpointing = True
+    _no_split_modules = ["Qwen3VLTextDecoderLayer", "Qwen3VLVisionBlock"]
+    _skip_keys_device_placement = "past_key_values"
+    _supports_flash_attn = True
+    _supports_sdpa = True
+
+    _can_compile_fullgraph = True
+    _supports_attention_backend = True
+    _can_record_outputs = {
+        "hidden_states": Qwen3VLTextDecoderLayer,
+        "attentions": Qwen3VLTextAttention,
+    }
+
+
+class Qwen3VLVisionModel(Qwen3VLPreTrainedModel):
+    config: Qwen3VLVisionConfig
+    _no_split_modules = ["Qwen3VLVisionBlock"]
+
+    def __init__(self, config, *inputs, **kwargs) -> None:
+        super().__init__(config, *inputs, **kwargs)
+        self.spatial_merge_size = config.spatial_merge_size
+        self.patch_size = config.patch_size
+        self.spatial_merge_unit = self.spatial_merge_size * self.spatial_merge_size
+
+        self.patch_embed = Qwen3VLVisionPatchEmbed(
+            config=config,
+        )
+
+        self.pos_embed = nn.Embedding(config.num_position_embeddings, config.hidden_size)
+        self.num_grid_per_side = int(config.num_position_embeddings**0.5)
+
+        head_dim = config.hidden_size // config.num_heads
+        self.rotary_pos_emb = Qwen3VLVisionRotaryEmbedding(head_dim // 2)
+
+        self.blocks = nn.ModuleList([Qwen3VLVisionBlock(config) for _ in range(config.depth)])
+        self.merger = Qwen3VLVisionPatchMerger(
+            config=config,
+            use_postshuffle_norm=False,
+        )
+
+        self.deepstack_visual_indexes = config.deepstack_visual_indexes
+        self.deepstack_merger_list = nn.ModuleList(
+            [
+                Qwen3VLVisionPatchMerger(
+                    config=config,
+                    use_postshuffle_norm=True,
+                )
+                for _ in range(len(config.deepstack_visual_indexes))
+            ]
+        )
+
+        self.gradient_checkpointing = False
+
+    def rot_pos_emb(self, grid_thw: torch.Tensor) -> torch.Tensor:
+        merge_size = self.spatial_merge_size
+
+        max_hw = int(grid_thw[:, 1:].max().item())
+        freq_table = self.rotary_pos_emb(max_hw)  # (max_hw, dim // 2)
+        device = freq_table.device
+
+        total_tokens = int(torch.prod(grid_thw, dim=1).sum().item())
+        pos_ids = torch.empty((total_tokens, 2), dtype=torch.long, device=device)
+
+        offset = 0
+        for num_frames, height, width in grid_thw:
+            merged_h, merged_w = height // merge_size, width // merge_size
+
+            block_rows = torch.arange(merged_h, device=device)  # block row indices
+            block_cols = torch.arange(merged_w, device=device)  # block col indices
+            intra_row = torch.arange(merge_size, device=device)  # intra-block row offsets
+            intra_col = torch.arange(merge_size, device=device)  # intra-block col offsets
+
+            # Compute full-resolution positions
+            row_idx = block_rows[:, None, None, None] * merge_size + intra_row[None, None, :, None]
+            col_idx = block_cols[None, :, None, None] * merge_size + intra_col[None, None, None, :]
+
+            row_idx = row_idx.expand(merged_h, merged_w, merge_size, merge_size).reshape(-1)
+            col_idx = col_idx.expand(merged_h, merged_w, merge_size, merge_size).reshape(-1)
+
+            coords = torch.stack((row_idx, col_idx), dim=-1)
+
+            if num_frames > 1:
+                coords = coords.repeat(num_frames, 1)
+
+            num_tokens = coords.shape[0]
+            pos_ids[offset : offset + num_tokens] = coords
+            offset += num_tokens
+
+        embeddings = freq_table[pos_ids]  # lookup rotary embeddings
+        embeddings = embeddings.flatten(1)
+        return embeddings
+
+    def fast_pos_embed_interpolate(self, grid_thw):
+        grid_ts, grid_hs, grid_ws = grid_thw[:, 0], grid_thw[:, 1], grid_thw[:, 2]
+
+        idx_list = [[] for _ in range(4)]
+        weight_list = [[] for _ in range(4)]
+
+        for t, h, w in zip(grid_ts, grid_hs, grid_ws):
+            h_idxs = torch.linspace(0, self.num_grid_per_side - 1, h)
+            w_idxs = torch.linspace(0, self.num_grid_per_side - 1, w)
+
+            h_idxs_floor = h_idxs.int()
+            w_idxs_floor = w_idxs.int()
+            h_idxs_ceil = (h_idxs.int() + 1).clip(max=self.num_grid_per_side - 1)
+            w_idxs_ceil = (w_idxs.int() + 1).clip(max=self.num_grid_per_side - 1)
+
+            dh = h_idxs - h_idxs_floor
+            dw = w_idxs - w_idxs_floor
+
+            base_h = h_idxs_floor * self.num_grid_per_side
+            base_h_ceil = h_idxs_ceil * self.num_grid_per_side
+
+            indices = [
+                (base_h[None].T + w_idxs_floor[None]).flatten(),
+                (base_h[None].T + w_idxs_ceil[None]).flatten(),
+                (base_h_ceil[None].T + w_idxs_floor[None]).flatten(),
+                (base_h_ceil[None].T + w_idxs_ceil[None]).flatten(),
+            ]
+
+            weights = [
+                ((1 - dh)[None].T * (1 - dw)[None]).flatten(),
+                ((1 - dh)[None].T * dw[None]).flatten(),
+                (dh[None].T * (1 - dw)[None]).flatten(),
+                (dh[None].T * dw[None]).flatten(),
+            ]
+
+            for i in range(4):
+                idx_list[i].extend(indices[i].tolist())
+                weight_list[i].extend(weights[i].tolist())
+
+        idx_tensor = torch.tensor(idx_list, dtype=torch.long, device=self.pos_embed.weight.device)
+        weight_tensor = torch.tensor(
+            weight_list, dtype=self.pos_embed.weight.dtype, device=self.pos_embed.weight.device
+        )
+        pos_embeds = self.pos_embed(idx_tensor) * weight_tensor[:, :, None]
+        patch_pos_embeds = pos_embeds[0] + pos_embeds[1] + pos_embeds[2] + pos_embeds[3]
+
+        patch_pos_embeds = patch_pos_embeds.split([h * w for h, w in zip(grid_hs, grid_ws)])
+
+        patch_pos_embeds_permute = []
+        merge_size = self.config.spatial_merge_size
+        for pos_embed, t, h, w in zip(patch_pos_embeds, grid_ts, grid_hs, grid_ws):
+            pos_embed = pos_embed.repeat(t, 1)
+            pos_embed = (
+                pos_embed.view(t, h // merge_size, merge_size, w // merge_size, merge_size, -1)
+                .permute(0, 1, 3, 2, 4, 5)
+                .flatten(0, 4)
+            )
+            patch_pos_embeds_permute.append(pos_embed)
+        patch_pos_embeds = torch.cat(patch_pos_embeds_permute)
+        return patch_pos_embeds
+
+    def forward(self, hidden_states: torch.Tensor, grid_thw: torch.Tensor, **kwargs) -> torch.Tensor:
+        """
+        Args:
+            hidden_states (`torch.Tensor` of shape `(seq_len, hidden_size)`):
+                The final hidden states of the model.
+            grid_thw (`torch.Tensor` of shape `(num_images_or_videos, 3)`):
+                The temporal, height and width of feature shape of each image in LLM.
+
+        Returns:
+            `torch.Tensor`: hidden_states.
+        """
+        hidden_states = self.patch_embed(hidden_states)
+
+        pos_embeds = self.fast_pos_embed_interpolate(grid_thw)
+        hidden_states = hidden_states + pos_embeds
+
+        rotary_pos_emb = self.rot_pos_emb(grid_thw)
+
+        seq_len, _ = hidden_states.size()
+        hidden_states = hidden_states.reshape(seq_len, -1)
+        rotary_pos_emb = rotary_pos_emb.reshape(seq_len, -1)
+        emb = torch.cat((rotary_pos_emb, rotary_pos_emb), dim=-1)
+        position_embeddings = (emb.cos(), emb.sin())
+
+        cu_seqlens = torch.repeat_interleave(grid_thw[:, 1] * grid_thw[:, 2], grid_thw[:, 0]).cumsum(
+            dim=0,
+            # Select dtype based on the following factors:
+            #  - FA2 requires that cu_seqlens_q must have dtype int32
+            #  - torch.onnx.export requires that cu_seqlens_q must have same dtype as grid_thw
+            # See https://github.com/huggingface/transformers/pull/34852 for more information
+            dtype=grid_thw.dtype if torch.jit.is_tracing() else torch.int32,
+        )
+        cu_seqlens = F.pad(cu_seqlens, (1, 0), value=0)
+
+        deepstack_feature_lists = []
+        for layer_num, blk in enumerate(self.blocks):
+            hidden_states = blk(
+                hidden_states,
+                cu_seqlens=cu_seqlens,
+                position_embeddings=position_embeddings,
+                **kwargs,
+            )
+            if layer_num in self.deepstack_visual_indexes:
+                deepstack_feature = self.deepstack_merger_list[self.deepstack_visual_indexes.index(layer_num)](
+                    hidden_states
+                )
+                deepstack_feature_lists.append(deepstack_feature)
+
+        hidden_states = self.merger(hidden_states)
+
+        return hidden_states, deepstack_feature_lists
+
+
+@auto_docstring(
+    custom_intro=(
+        "Text part of Qwen3VL, "
+        "not a pure text-only model, as DeepStack integrates visual features into the early hidden states."
+    )
+)
+class Qwen3VLTextModel(Qwen3VLPreTrainedModel):
+    config: Qwen3VLTextConfig
+    _no_split_modules = ["Qwen3VLTextDecoderLayer"]
+
+    def __init__(self, config: Qwen3VLTextConfig):
+        super().__init__(config)
+        self.padding_idx = config.pad_token_id
+        self.vocab_size = config.vocab_size
+
+        self.embed_tokens = nn.Embedding(config.vocab_size, config.hidden_size, self.padding_idx)
+        self.layers = nn.ModuleList(
+            [Qwen3VLTextDecoderLayer(config, layer_idx) for layer_idx in range(config.num_hidden_layers)]
+        )
+        self.norm = Qwen3VLTextRMSNorm(config.hidden_size, eps=config.rms_norm_eps)
+        self.rotary_emb = Qwen3VLTextRotaryEmbedding(config=config)
+        self.gradient_checkpointing = False
+        self.search_type = "none"
+        self.workingmemsize = 0
+
+        # Initialize weights and apply final processing
+        self.post_init()
+
+    @check_model_inputs
+    @auto_docstring
+    def forward(
+        self,
+        input_ids: Optional[torch.LongTensor] = None,
+        attention_mask: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.LongTensor] = None,
+        past_key_values: Optional[Cache] = None,
+        inputs_embeds: Optional[torch.FloatTensor] = None,
+        use_cache: Optional[bool] = None,
+        cache_position: Optional[torch.LongTensor] = None,
+        # args for deepstack
+        visual_pos_masks: Optional[torch.Tensor] = None,
+        deepstack_visual_embeds: Optional[list[torch.Tensor]] = None,
+        **kwargs: Unpack[FlashAttentionKwargs],
+    ) -> Union[tuple, BaseModelOutputWithPast]:
+        r"""
+        visual_pos_masks (`torch.Tensor` of shape `(batch_size, seqlen)`, *optional*):
+            The mask of the visual positions.
+        deepstack_visual_embeds (`list[torch.Tensor]`, *optional*):
+            The deepstack visual embeddings. The shape is (num_layers, visual_seqlen, embed_dim).
+            The feature is extracted from the different visual encoder layers, and fed to the decoder
+            hidden states. It's from the paper DeepStack(https://arxiv.org/abs/2406.04334).
+        """
+        if (input_ids is None) ^ (inputs_embeds is not None):
+            raise ValueError("You must specify exactly one of input_ids or inputs_embeds")
+
+        # torch.jit.trace() doesn't support cache objects in the output
+        if use_cache and past_key_values is None and not torch.jit.is_tracing():
+            past_key_values = DynamicCache(config=self.config)
+
+        if inputs_embeds is None:
+            inputs_embeds = self.embed_tokens(input_ids)
+
+        if cache_position is None:
+            past_seen_tokens = past_key_values.get_seq_length() if past_key_values is not None else 0
+            cache_position = torch.arange(
+                past_seen_tokens, past_seen_tokens + inputs_embeds.shape[1], device=inputs_embeds.device
+            )
+
+        # the hard coded `3` is for temporal, height and width.
+        if position_ids is None:
+            position_ids = cache_position.view(1, 1, -1).expand(3, inputs_embeds.shape[0], -1)
+        elif position_ids.ndim == 2:
+            position_ids = position_ids[None, ...].expand(3, position_ids.shape[0], -1)
+
+        if position_ids.ndim == 3 and position_ids.shape[0] == 4:
+            text_position_ids = position_ids[0]
+            position_ids = position_ids[1:]
+        else:
+            text_position_ids = position_ids[0]
+
+        attention_mask = create_causal_mask(
+            config=self.config,
+            input_embeds=inputs_embeds,
+            attention_mask=attention_mask,
+            cache_position=cache_position,
+            past_key_values=past_key_values,
+            position_ids=text_position_ids,
+        )
+
+        hidden_states = inputs_embeds
+
+        # create position embeddings to be shared across the decoder layers
+        position_embeddings = self.rotary_emb(hidden_states, position_ids)
+
+        # decoder layers
+        for layer_idx, decoder_layer in enumerate(self.layers):
+            layer_outputs = decoder_layer(
+                hidden_states,
+                attention_mask=attention_mask,
+                position_ids=text_position_ids,
+                past_key_values=past_key_values,
+                cache_position=cache_position,
+                position_embeddings=position_embeddings,
+                **kwargs,
+            )
+            hidden_states = layer_outputs
+
+            # add visual features to the hidden states of first several layers
+            if deepstack_visual_embeds is not None and layer_idx in range(len(deepstack_visual_embeds)):
+                hidden_states = self._deepstack_process(
+                    hidden_states,
+                    visual_pos_masks,
+                    deepstack_visual_embeds[layer_idx],
+                )
+
+        hidden_states = self.norm(hidden_states)
+
+        return BaseModelOutputWithPast(
+            last_hidden_state=hidden_states,
+            past_key_values=past_key_values,
+        )
+
+    def _deepstack_process(
+        self, hidden_states: torch.Tensor, visual_pos_masks: torch.Tensor, visual_embeds: torch.Tensor
+    ):
+        visual_pos_masks = visual_pos_masks.to(hidden_states.device)
+        visual_embeds = visual_embeds.to(hidden_states.device, hidden_states.dtype)
+        local_this = hidden_states[visual_pos_masks, :].clone() + visual_embeds
+        hidden_states[visual_pos_masks, :] = local_this
+        return hidden_states
+
+
+@auto_docstring
+class Qwen3VLModel(Qwen3VLPreTrainedModel):
+    base_model_prefix = ""
+    _checkpoint_conversion_mapping = {}
+    # Reference: fix gemma3 grad acc #37208
+    accepts_loss_kwargs = False
+    config: Qwen3VLConfig
+    _no_split_modules = ["Qwen3VLTextDecoderLayer", "Qwen3VLVisionBlock"]
+
+    def __init__(self, config):
+        super().__init__(config)
+        self.visual = Qwen3VLVisionModel._from_config(config.vision_config)
+        self.config = config
+        self.audio = WhisperEncoder._from_config(
+            config.audio_config, attn_implementation=config._attn_implementation
+        )
+        self.language_model = Qwen3VLTextModel._from_config(config.text_config)
+        self.rope_deltas = None  # cache rope_deltas here
+        self.fixed_memory_size = 0
+        self.fixed_memory_size_audio = 0
+        self.stepsize = 0
+        self.ttt_type = "simsample"
+        self.search_type = "none"
+
+        # Initialize weights and apply final processing
+        self.post_init()
+
+    def init_ttt_layers(
+        self,
+        num_heads=8,
+        ttt_gating=True,
+        ttt_minibatch_size=1024,
+        ttt_cg_type="ttt_mlp_cg",
+        CG_max_iter=0,
+        ttt_hidden_size=4,
+        ttt_base_lr=0.1,
+        freeze_ttt=False,
+        memgroupsize=0,
+        workingmemsize=0,
+    ):
+        hidden_size = self.config.text_config.hidden_size
+        total_embed_num = len(self.config.vision_config.deepstack_visual_indexes) + 1
+        # model_dim = hidden_size * total_embed_num
+        self.ttt_configs = TTTModelConfig(
+            model_dim=hidden_size,
+            num_heads=num_heads,
+            num_layers=1,
+            ttt_base_lr=ttt_base_lr,
+            mini_batch_size=ttt_minibatch_size,
+            ssm_layer=ttt_cg_type,
+            ttt_hidden_size=ttt_hidden_size,
+        )
+        self.ttt_minibatch_size = ttt_minibatch_size
+        self.ttt_layers = TTTWrapper(self.ttt_configs, CG_max_iter=CG_max_iter)
+        self.ttt_use_gating = ttt_gating
+        if ttt_gating:
+            self.ttt_gating = SSMGating(hidden_size)
+        self.use_ttt = True
+        self.freeze_ttt = freeze_ttt
+        self.memgroupsize = memgroupsize
+
+    def init_mem_search(self, search_type, workingmemsize=0):
+        self.hidden_size = self.config.text_config.hidden_size
+        if "attn" in search_type:
+            self.search_query = nn.Parameter(torch.randn(self.hidden_size))
+        self.search_alpha = nn.Parameter(torch.zeros(1))
+        self.search_type = search_type
+        self.workingmemsize = workingmemsize
+        if "kvcache" in self.search_type:
+            self.language_model.search_type = self.search_type
+            self.language_model.workingmemsize = self.workingmemsize
+
+    def get_input_embeddings(self):
+        return self.language_model.get_input_embeddings()
+
+    def set_input_embeddings(self, value):
+        self.language_model.set_input_embeddings(value)
+
+    def set_decoder(self, decoder):
+        self.language_model = decoder
+
+    def get_decoder(self):
+        return self.language_model
+
+    def get_rope_index(
+        self,
+        input_ids: Optional[torch.LongTensor] = None,
+        image_grid_thw: Optional[torch.LongTensor] = None,
+        video_grid_thw: Optional[torch.LongTensor] = None,
+        attention_mask: Optional[torch.Tensor] = None,
+    ) -> tuple[torch.Tensor, torch.Tensor]:
+        """Different from the original implementation, Qwen3VL use timestamps rather than absolute time position ids."""
+
+        # Since we use timestamps to seperate videos, like <t1> <vision_start> <frame1> <vision_end> <t2> <vision_start> <frame2> <vision_end>, the video_grid_thw should also be split
+        if video_grid_thw is not None:
+            video_grid_thw = torch.repeat_interleave(video_grid_thw, video_grid_thw[:, 0], dim=0)
+            video_grid_thw[:, 0] = 1
+
+        spatial_merge_size = self.config.vision_config.spatial_merge_size
+        image_token_id = self.config.image_token_id
+        video_token_id = self.config.video_token_id
+        vision_start_token_id = self.config.vision_start_token_id
+        mrope_position_deltas = []
+        if input_ids is not None and (image_grid_thw is not None or video_grid_thw is not None):
+            total_input_ids = input_ids
+            if attention_mask is None:
+                attention_mask = torch.ones_like(total_input_ids)
+            position_ids = torch.ones(
+                3,
+                input_ids.shape[0],
+                input_ids.shape[1],
+                dtype=input_ids.dtype,
+                device=input_ids.device,
+            )
+            image_index, video_index = 0, 0
+            attention_mask = attention_mask.to(total_input_ids.device)
+            for i, input_ids in enumerate(total_input_ids):
+                input_ids = input_ids[attention_mask[i] == 1]
+                image_nums, video_nums = 0, 0
+                vision_start_indices = torch.argwhere(input_ids == vision_start_token_id).squeeze(1)
+                vision_tokens = input_ids[vision_start_indices + 1]
+                image_nums = (vision_tokens == image_token_id).sum()
+                video_nums = (vision_tokens == video_token_id).sum()
+                input_tokens = input_ids.tolist()
+                llm_pos_ids_list: list = []
+                st = 0
+                remain_images, remain_videos = image_nums, video_nums
+                for _ in range(image_nums + video_nums):
+                    if image_token_id in input_tokens and remain_images > 0:
+                        ed_image = input_tokens.index(image_token_id, st)
+                    else:
+                        ed_image = len(input_tokens) + 1
+                    if video_token_id in input_tokens and remain_videos > 0:
+                        ed_video = input_tokens.index(video_token_id, st)
+                    else:
+                        ed_video = len(input_tokens) + 1
+                    if ed_image < ed_video:
+                        t, h, w = (
+                            image_grid_thw[image_index][0],
+                            image_grid_thw[image_index][1],
+                            image_grid_thw[image_index][2],
+                        )
+                        image_index += 1
+                        remain_images -= 1
+                        ed = ed_image
+
+                    else:
+                        t, h, w = (
+                            video_grid_thw[video_index][0],
+                            video_grid_thw[video_index][1],
+                            video_grid_thw[video_index][2],
+                        )
+                        video_index += 1
+                        remain_videos -= 1
+                        ed = ed_video
+                    llm_grid_t, llm_grid_h, llm_grid_w = (
+                        t.item(),
+                        h.item() // spatial_merge_size,
+                        w.item() // spatial_merge_size,
+                    )
+                    text_len = ed - st
+
+                    st_idx = llm_pos_ids_list[-1].max() + 1 if len(llm_pos_ids_list) > 0 else 0
+                    llm_pos_ids_list.append(torch.arange(text_len).view(1, -1).expand(3, -1) + st_idx)
+
+                    # t_index is always 0 because llm_grid_t is always 1 (we use timestamps to encode the temporal information for videos)
+                    t_index = torch.arange(llm_grid_t).view(-1, 1).expand(-1, llm_grid_h * llm_grid_w).flatten()
+                    h_index = torch.arange(llm_grid_h).view(1, -1, 1).expand(llm_grid_t, -1, llm_grid_w).flatten()
+                    w_index = torch.arange(llm_grid_w).view(1, 1, -1).expand(llm_grid_t, llm_grid_h, -1).flatten()
+                    llm_pos_ids_list.append(torch.stack([t_index, h_index, w_index]) + text_len + st_idx)
+                    st = ed + llm_grid_t * llm_grid_h * llm_grid_w
+
+                if st < len(input_tokens):
+                    st_idx = llm_pos_ids_list[-1].max() + 1 if len(llm_pos_ids_list) > 0 else 0
+                    text_len = len(input_tokens) - st
+                    llm_pos_ids_list.append(torch.arange(text_len).view(1, -1).expand(3, -1) + st_idx)
+
+                llm_positions = torch.cat(llm_pos_ids_list, dim=1).reshape(3, -1)
+                position_ids[..., i, attention_mask[i] == 1] = llm_positions.to(position_ids.device)
+                mrope_position_deltas.append(llm_positions.max() + 1 - len(total_input_ids[i]))
+            mrope_position_deltas = torch.tensor(mrope_position_deltas, device=input_ids.device).unsqueeze(1)
+            return position_ids, mrope_position_deltas
+        else:
+            if attention_mask is not None:
+                position_ids = attention_mask.long().cumsum(-1) - 1
+                position_ids.masked_fill_(attention_mask == 0, 1)
+                position_ids = position_ids.unsqueeze(0).expand(3, -1, -1).to(attention_mask.device)
+                max_position_ids = position_ids.max(0, keepdim=False)[0].max(-1, keepdim=True)[0]
+                mrope_position_deltas = max_position_ids + 1 - attention_mask.shape[-1]
+            else:
+                position_ids = (
+                    torch.arange(input_ids.shape[1], device=input_ids.device)
+                    .view(1, 1, -1)
+                    .expand(3, input_ids.shape[0], -1)
+                )
+                mrope_position_deltas = torch.zeros(
+                    [input_ids.shape[0], 1],
+                    device=input_ids.device,
+                    dtype=input_ids.dtype,
+                )
+
+            return position_ids, mrope_position_deltas
+
+    def get_audio_features(
+        self, audio_features: torch.FloatTensor
+    ):
+        audio_features = audio_features.type(self.audio.dtype)
+        audio_embeds = self.audio(audio_features)
+        return audio_embeds
+
+    def get_video_features(
+        self, pixel_values_videos: torch.FloatTensor, video_grid_thw: Optional[torch.LongTensor] = None
+    ):
+        """
+        Encodes videos into continuous embeddings that can be forwarded to the language model. The deepstack visual features are also returned.
+
+        Args:
+            pixel_values_videos (`torch.FloatTensor` of shape `(batch_size, num_channels, image_size, image_size)`):
+                The tensors corresponding to the input videos.
+            video_grid_thw (`torch.LongTensor` of shape `(num_videos, 3)`, *optional*):
+                The temporal, height and width of feature shape of each video in LLM.
+        """
+        # Same implementation as for images
+        return self.get_image_features(pixel_values_videos, video_grid_thw)
+
+    def get_image_features(self, pixel_values: torch.FloatTensor, image_grid_thw: Optional[torch.LongTensor] = None):
+        """
+        Encodes images into continuous embeddings that can be forwarded to the language model. The deepstack visual features are also returned.
+
+        Args:
+            pixel_values (`torch.FloatTensor` of shape `(batch_size, num_channels, image_size, image_size)`):
+                The tensors corresponding to the input images.
+            image_grid_thw (`torch.LongTensor` of shape `(num_images, 3)`, *optional*):
+                The temporal, height and width of feature shape of each image in LLM.
+        """
+        pixel_values = pixel_values.type(self.visual.dtype)
+        image_embeds, deepstack_image_embeds = self.visual(pixel_values, grid_thw=image_grid_thw)
+        split_sizes = (image_grid_thw.prod(-1) // self.visual.spatial_merge_size**2).tolist()
+        image_embeds = torch.split(image_embeds, split_sizes)
+        return image_embeds, deepstack_image_embeds
+
+    def get_placeholder_mask(
+        self,
+        input_ids: torch.LongTensor,
+        inputs_embeds: torch.FloatTensor,
+        image_features: Optional[torch.FloatTensor] = None,
+        video_features: Optional[torch.FloatTensor] = None,
+        audio_features: Optional[torch.FloatTensor] = None,
+    ):
+        """
+        Obtains multimodal placeholder mask from `input_ids` or `inputs_embeds`, and checks that the placeholder token count is
+        equal to the length of multimodal features. If the lengths are different, an error is raised.
+        """
+        if input_ids is None:
+            special_image_mask = inputs_embeds == self.get_input_embeddings()(
+                torch.tensor(self.config.image_token_id, dtype=torch.long, device=inputs_embeds.device)
+            )
+            special_image_mask = special_image_mask.all(-1)
+            special_video_mask = inputs_embeds == self.get_input_embeddings()(
+                torch.tensor(self.config.video_token_id, dtype=torch.long, device=inputs_embeds.device)
+            )
+            special_video_mask = special_video_mask.all(-1)
+            special_audio_mask = inputs_embeds == self.get_input_embeddings()(
+                torch.tensor(self.config.audio_token_id, dtype=torch.long, device=inputs_embeds.device)
+            )
+            special_audio_mask = special_audio_mask.all(-1)
+        else:
+            special_image_mask = input_ids == self.config.image_token_id
+            special_video_mask = input_ids == self.config.video_token_id
+            special_audio_mask = input_ids == self.config.audio_token_id
+
+        n_image_tokens = special_image_mask.sum()
+        special_image_mask = special_image_mask.unsqueeze(-1).expand_as(inputs_embeds).to(inputs_embeds.device)
+        if image_features is not None and inputs_embeds[special_image_mask].numel() != image_features.numel():
+            raise ValueError(
+                f"Image features and image tokens do not match: tokens: {n_image_tokens}, features {image_features.shape[0]}"
+            )
+
+        n_video_tokens = special_video_mask.sum()
+        special_video_mask = special_video_mask.unsqueeze(-1).expand_as(inputs_embeds).to(inputs_embeds.device)
+        # if video_features is not None and inputs_embeds[special_video_mask].numel() != video_features.numel():
+        # if (special_video_mask != 0).sum().item() != video_features.numel():
+        #     raise ValueError(
+        #         f"Videos features and video tokens do not match: tokens: {n_video_tokens}, features {video_features.shape[0]}"
+        #     )
+
+        n_audio_tokens = special_audio_mask.sum()
+        special_audio_mask = special_audio_mask.unsqueeze(-1).expand_as(inputs_embeds).to(inputs_embeds.device)
+        if audio_features is not None and inputs_embeds[special_audio_mask].numel() != audio_features.numel():
+            raise ValueError(
+                f"Audio features and audio tokens do not match: tokens: {n_audio_tokens}, features {audio_features.shape[0]}"
+            )
+
+        return special_image_mask, special_video_mask, special_audio_mask
+
+    def recursive_attention(
+        self,
+        video_embeds,
+        deepstack_video_embeds=None,
+        downsample_ids=None,
+        memory_size=None,
+        stepsize=None,
+        mergemode="",
+    ):
+        if deepstack_video_embeds is not None:
+            embed_size = video_embeds.size(-1)
+            video_embeds = torch.cat([video_embeds] + deepstack_video_embeds, dim=-1)
+        if downsample_ids is None:
+            downsample_ids = torch.tensor([n for n in range(0, video_embeds.size(0))]).to(video_embeds.device)
+        memory_size = self.fixed_memory_size if memory_size is None else memory_size
+        stepsize = self.stepsize if stepsize is None else stepsize
+        running_embeds = video_embeds[:memory_size]
+        running_downsample_ids = downsample_ids[:memory_size]
+        for step_id in range(memory_size, video_embeds.size(0), stepsize):
+            incoming_data = video_embeds[step_id:step_id+stepsize]
+            incoming_downids = downsample_ids[step_id:step_id+stepsize]
+            running_embeds = torch.cat([running_embeds, incoming_data], dim=0)
+            fullsize = running_embeds.size(0)
+            running_downsample_ids = torch.cat([running_downsample_ids, incoming_downids], dim=0)
+            emb_norms = F.normalize(running_embeds, dim=-1)
+            similarities = (emb_norms[:-1] * emb_norms[1:]).sum(dim=-1)
+            top_sim_ids = (-similarities.squeeze(0)).topk(memory_size)[1] + 1
+            top_sim_ids = torch.sort(top_sim_ids).values
+            if "simsample" in self.ttt_type and mergemode != "sim":
+                running_embeds = running_embeds[top_sim_ids]
+            else:
+                starts = torch.cat([top_sim_ids.new_zeros(1), top_sim_ids[:-1]], dim=0)
+                lengths = top_sim_ids - starts
+                row_idx = torch.arange(fullsize).unsqueeze(1).to(top_sim_ids.device)  # [N, 1]
+                group_range = (row_idx >= starts) & (row_idx < top_sim_ids)   # [N, M]
+                P_matrix = group_range.to(running_embeds.dtype) / lengths.to(running_embeds.dtype)
+                running_embeds = torch.einsum("nm,nd->md", P_matrix, running_embeds)
+            running_downsample_ids = running_downsample_ids[top_sim_ids.to(running_downsample_ids.device)]
+        running_embeds_deepstack = None
+        if deepstack_video_embeds is not None:
+            running_embeds = running_embeds.view(running_embeds.size(0), -1, embed_size)
+            running_embeds_deepstack = [running_embeds[:, i+1, :] for i in range(running_embeds.size(1) - 1)]
+            running_embeds = running_embeds[:, 0, :]
+        return running_embeds, running_embeds_deepstack, running_downsample_ids
+
+    def ttt_padding(self, video_embeds):
+        padding_length = 0
+        minibatchsize = self.ttt_minibatch_size
+        if video_embeds.size(1) % minibatchsize != 0:
+            padding_length = minibatchsize - video_embeds.size(1) % minibatchsize
+            padding = video_embeds.new_zeros(video_embeds.size(0), padding_length, video_embeds.size(-1))
+            video_embeds = torch.cat([video_embeds, padding], dim=1)
+        return video_embeds, padding_length
+
+    def forward_ttt_layers(self, pixel_values_videos, video_grid_thw, input_embeds):
+        if "ttt" in self.ttt_type:
+            freqs_cis = self.ttt_layers._precompute_freqs_cis_3d(
+                video_grid_thw[0, 1]//2, video_grid_thw[0, 2]//2, max(video_grid_thw[0, 0]*2, 128)).to(pixel_values_videos.device)
+
+        if self.fixed_memory_size > 0:
+            state_track = None
+            running_downsample_ids, running_embeddings, running_deepstack_embeds = None, None, None
+            stepsize = video_grid_thw[0, 1] * video_grid_thw[0, 2]
+            step = 0
+            num_frame_per_chunk = 256
+            # with torch.no_grad():
+            for i in range(0, video_grid_thw[0, 0], num_frame_per_chunk):
+                current_thw = video_grid_thw.clone()
+                current_thw[0, 0] = min(num_frame_per_chunk, video_grid_thw[0, 0] - i)
+                video_embeds, incoming_deepstack_embeds = self.get_video_features(pixel_values_videos[i*stepsize:(i+num_frame_per_chunk)*stepsize], current_thw)
+                video_embeds = torch.cat(video_embeds, dim=0).to(input_embeds.device, input_embeds.dtype)
+                if "ttt" in self.ttt_type:
+                    embed_dim = video_embeds.size(-1)
+                    if "concat" in self.ttt_type:
+                        video_embeds = torch.stack([video_embeds] + incoming_deepstack_embeds, dim=0)
+                    else:
+                        video_embeds = video_embeds.unsqueeze(0)
+                    # residual_video_emb = video_embeds
+                    incoming_embeddings, padding_length = self.ttt_padding(video_embeds)
+                    incoming_embeddings, state_track = self.ttt_layers(
+                        incoming_embeddings,
+                        freqs_cis=freqs_cis[step:step+incoming_embeddings.size(1)] if freqs_cis is not None else None,
+                        state_track=state_track,
+                    )
+                    if padding_length > 0:
+                        incoming_embeddings = incoming_embeddings[:, :-padding_length]
+                    if self.ttt_use_gating:
+                        incoming_embeddings = self.ttt_gating(incoming_embeddings) + video_embeds
+                    incoming_embeddings = incoming_embeddings.transpose(0, 1).reshape(incoming_embeddings.size(1), -1)
+                else:
+                    incoming_embeddings = video_embeds
+                incoming_downsample_ids = torch.tensor([n for n in range(0, incoming_embeddings.size(0))]).to(video_embeds.device) + step
+                step += incoming_downsample_ids.size(0)
+                # print(step)
+
+                if not self.training:
+                    torch.cuda.empty_cache()
+
+                if running_embeddings is not None:
+                    running_embeddings = torch.cat([running_embeddings, incoming_embeddings], dim=0)
+                    running_downsample_ids = torch.cat([running_downsample_ids, incoming_downsample_ids], dim=0)
+                    if "concat" not in self.ttt_type:
+                        running_deepstack_embeds = [torch.cat(
+                            [r_emb, i_emb], dim=0) for r_emb, i_emb in zip(running_deepstack_embeds, incoming_deepstack_embeds)]
+                        running_embeddings, running_deepstack_embeds, running_downsample_ids = self.recursive_attention(
+                            running_embeddings, deepstack_video_embeds=running_deepstack_embeds, downsample_ids=running_downsample_ids)
+                    else:
+                        running_embeddings, _, running_downsample_ids = self.recursive_attention(
+                            running_embeddings, downsample_ids=running_downsample_ids)
+                else:
+                    running_embeddings = incoming_embeddings
+                    running_downsample_ids = incoming_downsample_ids
+                    running_deepstack_embeds = incoming_deepstack_embeds
+                    if incoming_embeddings.size(0) > self.fixed_memory_size:
+                        if "concat" not in self.ttt_type:
+                            running_embeddings, running_deepstack_embeds, running_downsample_ids = self.recursive_attention(
+                                running_embeddings, deepstack_video_embeds=running_deepstack_embeds, downsample_ids=running_downsample_ids)
+                        else:
+                            running_embeddings, _, running_downsample_ids = self.recursive_attention(
+                                running_embeddings, downsample_ids=running_downsample_ids)
+            downsample_ids = running_downsample_ids
+            video_embeds = running_embeddings
+            deepstack_video_embeds = running_deepstack_embeds
+        else:
+            video_embeds, padding_length = self.ttt_padding(video_embeds)
+            video_embeds, state_track = self.ttt_layers(video_embeds, freqs_cis=freqs_cis)
+
+            if padding_length > 0:
+                video_embeds = video_embeds[:, :-padding_length]
+
+            if self.ttt_use_gating:
+                video_embeds = self.ttt_gating(video_embeds) + residual_video_emb
+
+            video_embeds, _, downsample_ids = self.recursive_attention(video_embeds.squeeze(0), downsample_ids=downsample_ids)
+        # Split
+        if "concat" in self.ttt_type:
+            video_embeds = video_embeds.view(video_embeds.size(0), -1, embed_dim)
+            deepstack_video_embeds = [video_embeds[:, i+1, :] for i in range(video_embeds.size(1) - 1)]
+            video_embeds = video_embeds[:, 0, :]
+        return video_embeds, deepstack_video_embeds, downsample_ids
+
+    def compute_segment_logits_with_similarity_minmax(self, X, s, alpha=1.0, eps=1e-8):
+        T, N = X.shape
+
+        X_norm = F.normalize(X, p=2, dim=1, eps=eps)          # (T, N)
+
+        # sim_forward[t] ~ cos(x_t, x_{t+1}) for t=0..T-2
+        sim_forward = (X_norm[:-1] * X_norm[1:]).sum(dim=1)   # (T-1,)
+        ones = torch.ones(1, device=X.device, dtype=X.dtype)
+        sim_left  = torch.cat([ones, sim_forward])            # (T,)
+        sim_right = torch.cat([sim_forward, ones])            # (T,)
+
+        sim_mean = (sim_left + sim_right) / 2.0               # (T,)
+        dissim = (1.0 - sim_mean) / 2.0                               # (T,) approx in [0, 2]
+
+        # 2. Min-max normalize scores to [0, 1]
+        s_min = s.min()
+        s_max = s.max()
+        s_norm = (s - s_min) / (s_max - s_min + eps)          # [0,1]
+
+        simscaling = torch.sigmoid(self.search_alpha)
+
+        z = (1 - simscaling) * s_norm + simscaling * dissim
+        return z
+
+    def gumbel_top_k(self, scores, K, tau=1.0, eps=1e-8):
+        T = scores.shape[0]
+        # 1) Sample Gumbel noise
+        u = torch.rand_like(scores)
+        gumbel = -torch.log(-torch.log(u + eps) + eps)
+
+        # 2) Gumbel-perturbed scores
+        perturbed = scores + gumbel
+
+        # 3) Take Top-K
+        topk_vals, topk_idx = torch.topk(perturbed, K, dim=0)  # (K,), (K,)
+
+        # 4) Turn those K values into a softmax distribution (optional smoothing)
+        topk_weights = F.softmax(topk_vals / tau, dim=0)       # (K,)
+
+        # 5) Scatter back into a (T,) vector
+        weights = torch.zeros_like(scores)
+        weights[topk_idx] = topk_weights
+
+        return topk_idx, weights
+
+    def select_representatives_gumbel_top_k_ste(self, X, s, K, tau=1.0):
+        # 1) Gumbel-Top-K selection
+        idx, w = self.gumbel_top_k(s, K, tau=tau)   # idx: (K,), w: (T,)
+
+        # 2) Hard representatives: actual selected rows
+        reps_hard = X[idx]                     # (K, N)
+        soft_vec = torch.matmul(w, X)          # (N,)
+        reps_soft = soft_vec.unsqueeze(0).expand(K, -1)  # (K, N)
+
+        reps = reps_soft + (reps_hard - reps_soft).detach()
+
+        return reps, idx, w
+
+    def importance_pool(self, video_embed, importance, memory_size):
+        T, N = video_embed.shape
+        if "gumbel" not in self.search_type:
+            if "softmax" in self.search_type:
+                importance = torch.softmax(importance, dim=-1)
+            elif "sigmoid" in self.search_type:
+                importance = torch.sigmoid(importance)
+            importance = self.compute_segment_logits_with_similarity_minmax(video_embed, importance)
+            top_sim_ids = torch.sort(importance.topk(memory_size)[1]).values
+            video_embed = importance.unsqueeze(1) * video_embed
+            starts = torch.cat([top_sim_ids.new_zeros(1) - 1, top_sim_ids[:-1]], dim=0)
+            lengths = top_sim_ids - starts
+            row_idx = torch.arange(T).unsqueeze(1).to(top_sim_ids.device)  # [N, 1]
+            group_range = (row_idx > starts) & (row_idx <= top_sim_ids)   # [N, M]
+            P_matrix = group_range.to(video_embed.dtype) / lengths.to(video_embed.dtype)
+            video_embed = torch.einsum("nm,nd->md", P_matrix, video_embed)
+        else:
+            importance = self.compute_segment_logits_with_similarity_minmax(video_embed, importance)
+            video_embed, top_sim_ids, weights = self.select_representatives_gumbel_top_k_ste(video_embed, importance, memory_size)
+        return video_embed, top_sim_ids
+
+    def chunk_memory(self, video_embeds, deepstack_video_embeds, downsample_ids, hidden_states):
+        if "attn" in self.search_type:
+            attention_scores = torch.einsum("k,ijk->ij", self.search_query, hidden_states)
+            attention_scores = F.softmax(attention_scores / math.sqrt(self.search_query.size(0)), dim=-1)
+            search_query = torch.einsum("ij,ijk->ik", attention_scores, hidden_states).unsqueeze(1)
+        else:
+            search_query = hidden_states.sum(dim=1, keepdim=True)
+        scores = torch.einsum("ij,j->i", video_embeds, search_query.squeeze(0).squeeze(0)) / math.sqrt(self.hidden_size)
+        memsize = min(video_embeds.size(0), self.workingmemsize)
+        video_embeds, local_downsample_ids = self.importance_pool(video_embeds, scores, memsize)
+        deepstack_video_embeds = [emb[local_downsample_ids] for emb in deepstack_video_embeds]
+        downsample_ids = downsample_ids[local_downsample_ids]
+        return video_embeds, deepstack_video_embeds, downsample_ids
+
+    @auto_docstring
+    @check_model_inputs
+    def forward(
+        self,
+        input_ids: torch.LongTensor = None,
+        attention_mask: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.LongTensor] = None,
+        past_key_values: Optional[Cache] = None,
+        inputs_embeds: Optional[torch.FloatTensor] = None,
+        pixel_values: Optional[torch.Tensor] = None,
+        pixel_values_videos: Optional[torch.FloatTensor] = None,
+        image_grid_thw: Optional[torch.LongTensor] = None,
+        video_grid_thw: Optional[torch.LongTensor] = None,
+        cache_position: Optional[torch.LongTensor] = None,
+        audio_feature: Optional[torch.Tensor] = None,
+        distillround: bool = False,
+        labels: Optional[torch.LongTensor] = None,
+        memory_triplets: Optional[torch.Tensor] = None,
+        **kwargs: Unpack[TransformersKwargs],
+    ) -> Union[tuple, Qwen3VLModelOutputWithPast]:
+        r"""
+        image_grid_thw (`torch.LongTensor` of shape `(num_images, 3)`, *optional*):
+            The temporal, height and width of feature shape of each image in LLM.
+        video_grid_thw (`torch.LongTensor` of shape `(num_videos, 3)`, *optional*):
+            The temporal, height and width of feature shape of each video in LLM.
+        """
+        if (input_ids is None) ^ (inputs_embeds is not None):
+            raise ValueError("You must specify exactly one of input_ids or inputs_embeds")
+
+        if inputs_embeds is None:
+            inputs_embeds = self.get_input_embeddings()(input_ids)
+
+        image_mask = None
+        video_mask = None
+
+        if pixel_values is not None:
+            image_embeds, deepstack_image_embeds = self.get_image_features(pixel_values, image_grid_thw)
+            image_embeds = torch.cat(image_embeds, dim=0).to(inputs_embeds.device, inputs_embeds.dtype)
+            image_mask, _ = self.get_placeholder_mask(
+                input_ids, inputs_embeds=inputs_embeds, image_features=image_embeds
+            )
+            inputs_embeds = inputs_embeds.masked_scatter(image_mask, image_embeds)
+
+        all_memory = None
+        if pixel_values_videos is not None:
+            if self.fixed_memory_size > 0:
+                if memory_triplets is not None:
+                    video_embeds, deepstack_video_embeds, downsample_ids = memory_triplets["video_embeds"], memory_triplets["deepstack_video_embeds"], memory_triplets["downsample_ids"]
+                elif self.freeze_ttt:
+                    with torch.no_grad():
+                        video_embeds, deepstack_video_embeds, downsample_ids = self.forward_ttt_layers(pixel_values_videos, video_grid_thw, inputs_embeds)
+                        if self.search_type != "none" and memory_triplets is None:
+                            all_memory = {
+                                "video_embeds": video_embeds,
+                                "deepstack_video_embeds": deepstack_video_embeds,
+                                "downsample_ids": downsample_ids,
+                            }
+                            memsize = self.workingmemsize // 8
+                            video_embeds, deepstack_video_embeds, downsample_ids = self.recursive_attention(
+                                video_embeds, deepstack_video_embeds=deepstack_video_embeds, downsample_ids=downsample_ids, memory_size=memsize)
+                else:
+                    video_embeds, deepstack_video_embeds, downsample_ids = self.forward_ttt_layers(pixel_values_videos, video_grid_thw, inputs_embeds)
+                    if self.search_type != "none" and memory_triplets is None:
+                        all_memory = {
+                            "video_embeds": video_embeds,
+                            "deepstack_video_embeds": deepstack_video_embeds,
+                            "downsample_ids": downsample_ids,
+                        }
+                        memsize = self.workingmemsize // 8
+                        video_embeds, deepstack_video_embeds, downsample_ids = self.recursive_attention(
+                            video_embeds, deepstack_video_embeds=deepstack_video_embeds, downsample_ids=downsample_ids, memory_size=memsize)
+                _, video_mask, _ = self.get_placeholder_mask(
+                    input_ids, inputs_embeds=inputs_embeds, video_features=video_embeds
+                )
+            else:
+                video_embeds, deepstack_video_embeds = self.get_video_features(pixel_values_videos, video_grid_thw)
+                video_embeds = torch.cat(video_embeds, dim=0).to(inputs_embeds.device, inputs_embeds.dtype)
+                _, video_mask, _ = self.get_placeholder_mask(
+                    input_ids, inputs_embeds=inputs_embeds, video_features=video_embeds
+                )
+                inputs_embeds = inputs_embeds.masked_scatter(video_mask, video_embeds)
+            if torch.cuda.current_device() == 0:
+                print(f"RANK 0 video embeds shape: {video_embeds.shape}")
+
+        audio_downsample_ids = None
+        if audio_feature is not None:
+            audio_embeds = self.get_audio_features(audio_feature)
+            if torch.cuda.current_device() == 0:
+                print(f"RANK 0 audio embeds shape: {audio_embeds.shape}")
+            _, _, audio_mask = self.get_placeholder_mask(
+                input_ids, inputs_embeds=inputs_embeds, audio_features=audio_embeds
+            )
+            if self.fixed_memory_size > 0 and not distillround:
+                audio_embeds, _, audio_downsample_ids = self.recursive_attention(
+                    audio_embeds.view(-1, audio_embeds.size(-1)),
+                    memory_size=self.fixed_memory_size_audio,
+                    stepsize=self.stepsize,
+                    mergemode="sim",
+                )
+            else:
+                inputs_embeds = inputs_embeds.masked_scatter(audio_mask, audio_embeds)
+        # print(f"Both shapes: {video_embeds.shape}, {audio_embeds.shape}")
+
+        visual_pos_masks = None
+        deepstack_visual_embeds = None
+        if image_mask is not None and video_mask is not None:
+            # aggregate visual_pos_masks and deepstack_visual_embeds
+            image_mask = image_mask[..., 0]
+            video_mask = video_mask[..., 0]
+            visual_pos_masks = image_mask | video_mask
+            deepstack_visual_embeds = []
+            image_mask_joint = image_mask[visual_pos_masks]
+            video_mask_joint = video_mask[visual_pos_masks]
+            for img_embed, vid_embed in zip(deepstack_image_embeds, deepstack_video_embeds):
+                embed_joint = img_embed.new_zeros(visual_pos_masks.sum(), img_embed.shape[-1]).to(img_embed.device)
+                embed_joint[image_mask_joint, :] = img_embed
+                embed_joint[video_mask_joint, :] = vid_embed
+                deepstack_visual_embeds.append(embed_joint)
+        elif image_mask is not None:
+            image_mask = image_mask[..., 0]
+            visual_pos_masks = image_mask
+            deepstack_visual_embeds = deepstack_image_embeds
+        elif video_mask is not None:
+            visual_pos_masks = video_mask[..., 0]
+            deepstack_visual_embeds = deepstack_video_embeds
+
+        if position_ids is None:
+            attention_mask_tensor = (
+                attention_mask if not isinstance(attention_mask, dict) else attention_mask["full_attention"]
+            )
+            if attention_mask_tensor is not None and attention_mask_tensor.ndim == 4:
+                attention_mask_tensor = torch.diagonal(attention_mask_tensor[:, 0], dim1=1, dim2=2)
+                # Only apply conversion for floating point tensors (inverted masks)
+                if attention_mask_tensor.dtype.is_floating_point:
+                    attention_mask_tensor = attention_mask_tensor / torch.finfo(attention_mask_tensor.dtype).min
+                    attention_mask_tensor = (1.0 - attention_mask_tensor).int()
+
+            # Calculate RoPE index once per generation in the pre-fill stage only.
+            # When compiling, we can't check tensor values thus we check only input length
+            # It is safe to assume that `length!=1` means we're in pre-fill because compiled
+            # models currently cannot do asssisted decoding
+            prefill_compiled_stage = is_torchdynamo_compiling() and (
+                (input_ids is not None and input_ids.shape[1] != 1)
+                or (inputs_embeds is not None and inputs_embeds.shape[1] != 1)
+            )
+            prefill_noncompiled_stage = not is_torchdynamo_compiling() and (
+                (cache_position is not None and cache_position[0] == 0)
+                or (past_key_values is None or past_key_values.get_seq_length() == 0)
+            )
+            if (prefill_compiled_stage or prefill_noncompiled_stage) or self.rope_deltas is None:
+                position_ids, rope_deltas = self.get_rope_index(
+                    input_ids,
+                    image_grid_thw,
+                    video_grid_thw,
+                    attention_mask=attention_mask_tensor,
+                )
+                self.rope_deltas = rope_deltas
+            # then use the prev pre-calculated rope-deltas to get the correct position ids
+            else:
+                batch_size, seq_length, _ = inputs_embeds.shape
+                delta = (
+                    (cache_position[0] + self.rope_deltas).to(inputs_embeds.device)
+                    if cache_position is not None
+                    else 0
+                )
+                position_ids = torch.arange(seq_length, device=inputs_embeds.device)
+                position_ids = position_ids.view(1, -1).expand(batch_size, -1)
+                if cache_position is not None:  # otherwise `deltas` is an int `0`
+                    delta = delta.repeat_interleave(batch_size // delta.shape[0], dim=0)
+                position_ids = position_ids.add(delta)
+                position_ids = position_ids.unsqueeze(0).expand(3, -1, -1)
+
+        if self.fixed_memory_size > 0 and pixel_values_videos is not None and not distillround:
+            video_mask_sel = torch.where(visual_pos_masks == 1)[1][downsample_ids]
+            if audio_feature is not None and audio_downsample_ids is not None:
+                audio_mask_sel = torch.where(audio_mask[:, :, 0] == 1)[1][audio_downsample_ids]
+                keep_mask = ~(audio_mask[:, :, 0] + visual_pos_masks)
+                keep_mask[:, video_mask_sel] = True
+                keep_mask[:, audio_mask_sel] = True
+                keep_ids = torch.where(keep_mask)[1]
+                inputs_embeds = inputs_embeds[:, keep_ids]
+                inputs_embeds = inputs_embeds.masked_scatter(video_mask[:, keep_ids], video_embeds)
+                inputs_embeds = inputs_embeds.masked_scatter(audio_mask[:, keep_ids], audio_embeds)
+            else:
+                keep_mask = ~visual_pos_masks
+                keep_mask[:, video_mask_sel] = True
+                keep_ids = torch.where(keep_mask)[1]
+                inputs_embeds = inputs_embeds[:, keep_ids]
+                inputs_embeds = inputs_embeds.masked_scatter(video_mask[:, keep_ids], video_embeds)
+            if labels is not None:
+                labels = labels[:, keep_ids]
+            attention_mask = attention_mask[:, keep_ids]
+            visual_pos_masks = visual_pos_masks[:, keep_ids]
+            newposids = []
+            for posids in position_ids:
+                newposid = posids[:, keep_ids]
+                newposids.append(newposid)
+            position_ids = torch.stack(newposids, dim=0)
+
+        outputs = self.language_model(
+            input_ids=None,
+            position_ids=position_ids,
+            attention_mask=attention_mask,
+            past_key_values=past_key_values,
+            inputs_embeds=inputs_embeds,
+            cache_position=cache_position,
+            visual_pos_masks=visual_pos_masks,
+            deepstack_visual_embeds=deepstack_visual_embeds,
+            **kwargs,
+        )
+        if self.search_type != "none" and all_memory is not None:
+            query_start_pos = torch.where(input_ids == 151653)[1][-1].item() + 2 - input_ids.size(1)
+            if len(torch.where(input_ids == 151644)[1]) > 2:
+                gen_start_pos = torch.where(input_ids == 151644)[1][2].item() + 2 - input_ids.size(1)
+            else:
+                gen_start_pos = -1
+            hidden_states = outputs.last_hidden_state[:, query_start_pos:gen_start_pos]
+            video_embeds, deepstack_video_embeds, downsample_ids = self.chunk_memory(
+                all_memory["video_embeds"],
+                all_memory["deepstack_video_embeds"],
+                all_memory["downsample_ids"],
+                hidden_states,
+            )
+            memory_triplets = {
+                "video_embeds": video_embeds,
+                "deepstack_video_embeds": deepstack_video_embeds,
+                "downsample_ids": downsample_ids,
+            }
+        else:
+            memory_triplets = None
+            torch.cuda.empty_cache()
+
+        return Qwen3VLModelOutputWithPast(
+            last_hidden_state=outputs.last_hidden_state,
+            past_key_values=outputs.past_key_values,
+            rope_deltas=self.rope_deltas,
+            labels=labels,
+            memory_triplets=memory_triplets,
+        )
+
+
+@dataclass
+@auto_docstring(
+    custom_intro="""
+    Base class for Qwen3VL causal language model (or autoregressive) outputs.
+    """
+)
+class Qwen3VLCausalLMOutputWithPast(ModelOutput):
+    r"""
+    loss (`torch.FloatTensor` of shape `(1,)`, *optional*, returned when `labels` is provided):
+        Language modeling loss (for next-token prediction).
+    logits (`torch.FloatTensor` of shape `(batch_size, sequence_length, config.vocab_size)`):
+        Prediction scores of the language modeling head (scores for each vocabulary token before SoftMax).
+    past_key_values (`Cache`, *optional*, returned when `use_cache=True` is passed or when `config.use_cache=True`):
+        It is a [`~cache_utils.Cache`] instance. For more details, see our [kv cache guide](https://huggingface.co/docs/transformers/en/kv_cache).
+
+        Contains pre-computed hidden-states (key and values in the self-attention blocks) that can be used (see
+        `past_key_values` input) to speed up sequential decoding.
+    rope_deltas (`torch.LongTensor` of shape `(batch_size, )`, *optional*):
+        The rope index difference between sequence length and multimodal rope.
+    """
+
+    loss: Optional[torch.FloatTensor] = None
+    logits: Optional[torch.FloatTensor] = None
+    past_key_values: Optional[Cache] = None
+    hidden_states: Optional[tuple[torch.FloatTensor]] = None
+    attentions: Optional[tuple[torch.FloatTensor]] = None
+    rope_deltas: Optional[torch.LongTensor] = None
+    memory_triplets: Optional[Dict[str, torch.Tensor]] = None
+
+
+class Qwen3VLForConditionalGeneration(Qwen3VLPreTrainedModel, GenerationMixin):
+    _checkpoint_conversion_mapping = {}
+    _tied_weights_keys = ["lm_head.weight"]
+    # Reference: fix gemma3 grad acc #37208
+    accepts_loss_kwargs = False
+    config: Qwen3VLConfig
+
+    def __init__(self, config):
+        super().__init__(config)
+        self.model = Qwen3VLModel(config)
+        self.lm_head = nn.Linear(config.text_config.hidden_size, config.text_config.vocab_size, bias=False)
+
+        self.post_init()
+
+    def get_input_embeddings(self):
+        return self.model.get_input_embeddings()
+
+    def set_input_embeddings(self, value):
+        self.model.set_input_embeddings(value)
+
+    def set_decoder(self, decoder):
+        self.model.set_decoder(decoder)
+
+    def get_decoder(self):
+        return self.model.get_decoder()
+
+    def get_video_features(
+        self, pixel_values_videos: torch.FloatTensor, video_grid_thw: Optional[torch.LongTensor] = None
+    ):
+        return self.model.get_video_features(pixel_values_videos, video_grid_thw)
+
+    def get_image_features(self, pixel_values: torch.FloatTensor, image_grid_thw: Optional[torch.LongTensor] = None):
+        return self.model.get_image_features(pixel_values, image_grid_thw)
+
+    # Make modules available through conditional class for BC
+    @property
+    def language_model(self):
+        return self.model.language_model
+
+    @property
+    def visual(self):
+        return self.model.visual
+
+    @check_model_inputs
+    def forward(
+        self,
+        input_ids: torch.LongTensor = None,
+        attention_mask: Optional[torch.Tensor] = None,
+        position_ids: Optional[torch.LongTensor] = None,
+        past_key_values: Optional[Cache] = None,
+        inputs_embeds: Optional[torch.FloatTensor] = None,
+        labels: Optional[torch.LongTensor] = None,
+        pixel_values: Optional[torch.Tensor] = None,
+        pixel_values_videos: Optional[torch.FloatTensor] = None,
+        image_grid_thw: Optional[torch.LongTensor] = None,
+        video_grid_thw: Optional[torch.LongTensor] = None,
+        cache_position: Optional[torch.LongTensor] = None,
+        logits_to_keep: Union[int, torch.Tensor] = 0,
+        audio_feature: Optional[torch.Tensor] = None,
+        train_type: Optional[str] = "sft",
+        distillround: bool = False,
+        memory_triplets: Optional[dict] = None,
+        **kwargs: Unpack[TransformersKwargs],
+    ) -> Union[tuple, Qwen3VLCausalLMOutputWithPast]:
+        r"""
+        labels (`torch.LongTensor` of shape `(batch_size, sequence_length)`, *optional*):
+            Labels for computing the masked language modeling loss. Indices should either be in `[0, ...,
+            config.vocab_size]` or -100 (see `input_ids` docstring). Tokens with indices set to `-100` are ignored
+            (masked), the loss is only computed for the tokens with labels in `[0, ..., config.vocab_size]`.
+        image_grid_thw (`torch.LongTensor` of shape `(num_images, 3)`, *optional*):
+            The temporal, height and width of feature shape of each image in LLM.
+        video_grid_thw (`torch.LongTensor` of shape `(num_videos, 3)`, *optional*):
+            The temporal, height and width of feature shape of each video in LLM.
+
+        Example:
+            TODO: Add example
+        """
+        outputs = self.model(
+            input_ids=input_ids,
+            pixel_values=pixel_values,
+            pixel_values_videos=pixel_values_videos,
+            image_grid_thw=image_grid_thw,
+            video_grid_thw=video_grid_thw,
+            position_ids=position_ids,
+            attention_mask=attention_mask,
+            past_key_values=past_key_values,
+            inputs_embeds=inputs_embeds,
+            cache_position=cache_position,
+            audio_feature=audio_feature,
+            labels=labels,
+            distillround=distillround,
+            memory_triplets=memory_triplets,
+            **kwargs,
+        )
+
+        if outputs.labels is not None:
+            labels = outputs.labels
+
+        hidden_states = outputs[0]
+
+        loss = None
+        logits = None
+
+        shift_labels = kwargs.pop("shift_labels", None)
+        return_logits = kwargs.pop("return_logits", False)
+        memory_triplets = outputs.memory_triplets
+
+        if self.training and (labels is not None or shift_labels is not None):
+            loss = LigerForCausalLMLoss(
+                hidden_states=hidden_states,
+                lm_head_weight=self.lm_head.weight,
+                labels=labels,
+                shift_labels=shift_labels,
+                hidden_size=self.config.text_config.hidden_size,
+                **kwargs,
+            )
+            if return_logits:
+                distill_labels = labels[0, 1:]
+                start_idx = torch.where((distill_labels != -100)==True)[0][0]
+                logits = self.lm_head(hidden_states[:, start_idx:, :])
+        elif memory_triplets is None:
+            # Only compute necessary logits, and do not upcast them to float if we are not computing the loss
+            slice_indices = slice(-logits_to_keep, None) if isinstance(logits_to_keep, int) else logits_to_keep
+            logits = self.lm_head(hidden_states[:, slice_indices, :])
+
+            if labels is not None:
+                loss = self.loss_function(logits=logits, labels=labels, vocab_size=self.config.text_config.vocab_size)
+
+        return Qwen3VLCausalLMOutputWithPast(
+            loss=loss,
+            logits=logits,
+            past_key_values=outputs.past_key_values,
+            rope_deltas=outputs.rope_deltas,
+            memory_triplets=memory_triplets,
+        )
+
+    def prepare_inputs_for_generation(
+        self,
+        input_ids,
+        past_key_values=None,
+        attention_mask=None,
+        inputs_embeds=None,
+        cache_position=None,
+        position_ids=None,
+        use_cache=True,
+        pixel_values=None,
+        pixel_values_videos=None,
+        image_grid_thw=None,
+        video_grid_thw=None,
+        audio_feature=None,
+        **kwargs,
+    ):
+        # Overwritten -- in specific circumstances we don't want to forward image inputs to the model
+
+        model_inputs = super().prepare_inputs_for_generation(
+            input_ids,
+            past_key_values=past_key_values,
+            attention_mask=attention_mask,
+            inputs_embeds=inputs_embeds,
+            cache_position=cache_position,
+            position_ids=position_ids,
+            pixel_values=pixel_values,
+            pixel_values_videos=pixel_values_videos,
+            image_grid_thw=image_grid_thw,
+            video_grid_thw=video_grid_thw,
+            use_cache=use_cache,
+            audio_feature=audio_feature,
+            **kwargs,
+        )
+
+        # Qwen3VL position_ids are prepareed with rope_deltas in forward
+        model_inputs["position_ids"] = None
+
+        if cache_position[0] != 0:
+            model_inputs["pixel_values"] = None
+            model_inputs["pixel_values_videos"] = None
+            model_inputs["audio_feature"] = None
+
+        return model_inputs
+
+    def _get_image_nums_and_video_nums(
+        self,
+        input_ids: Optional[torch.LongTensor],
+        inputs_embeds: Optional[torch.Tensor] = None,
+    ) -> tuple[torch.Tensor, torch.Tensor]:
+        """
+        Get the number of images and videos for each sample to calculate the separation length of the sample tensor.
+        These parameters are not passed through the processor to avoid unpredictable impacts from interface modifications.
+
+        Args:
+            input_ids (`torch.LongTensor` of shape `(batch_size, sequence_length)`):
+                Indices of input sequence tokens in the vocabulary.
+
+        Returns:
+            image_nums (`torch.LongTensor` of shape `(batch_size, num_images_sample)`)
+            video_nums (`torch.LongTensor` of shape `(batch_size, num_videos_sample)`)
+        """
+        image_token_id = self.config.image_token_id
+        video_token_id = self.config.video_token_id
+        vision_start_token_id = self.config.vision_start_token_id
+
+        if inputs_embeds is not None:
+            vision_start_mask = (
+                inputs_embeds
+                == self.get_input_embeddings()(
+                    torch.tensor(vision_start_token_id, dtype=torch.long, device=inputs_embeds.device)
+                )
+            )[..., 0]
+            image_mask = (
+                inputs_embeds
+                == self.get_input_embeddings()(
+                    torch.tensor(image_token_id, dtype=torch.long, device=inputs_embeds.device)
+                )
+            )[..., 0]
+            video_mask = (
+                inputs_embeds
+                == self.get_input_embeddings()(
+                    torch.tensor(video_token_id, dtype=torch.long, device=inputs_embeds.device)
+                )
+            )[..., 0]
+        else:
+            vision_start_mask = input_ids == vision_start_token_id
+            image_mask = input_ids == image_token_id
+            video_mask = input_ids == video_token_id
+
+        vision_first_mask = torch.roll(vision_start_mask, shifts=1, dims=1)
+        image_nums = torch.sum(vision_first_mask & image_mask, dim=1)
+        video_nums = torch.sum(vision_first_mask & video_mask, dim=1)
+
+        return image_nums, video_nums
+
+    def _expand_inputs_for_generation(
+        self,
+        expand_size: int = 1,
+        is_encoder_decoder: bool = False,
+        input_ids: Optional[torch.LongTensor] = None,
+        **model_kwargs,
+    ) -> tuple[torch.LongTensor, dict[str, Any]]:
+        # Overwritten -- Support for expanding tensors without a batch size dimension
+        # e.g., pixel_values, image_grid_thw, pixel_values_videos, video_grid_thw, second_per_grid_t
+        # pixel_values.shape[0] is sum(seqlen_images for samples)
+        # image_grid_thw.shape[0] is sum(num_images for samples)
+
+        if expand_size == 1:
+            return input_ids, model_kwargs
+
+        visual_keys = ["pixel_values", "image_grid_thw", "pixel_values_videos", "video_grid_thw", "second_per_grid_ts"]
+
+        def _expand_dict_for_generation_visual(dict_to_expand):
+            image_grid_thw = model_kwargs.get("image_grid_thw", None)
+            video_grid_thw = model_kwargs.get("video_grid_thw", None)
+            image_nums, video_nums = self._get_image_nums_and_video_nums(
+                input_ids, inputs_embeds=model_kwargs.get("inputs_embeds", None)
+            )
+
+            def _repeat_interleave_samples(x, lengths, repeat_times):
+                samples = torch.split(x, lengths)
+                repeat_args = [repeat_times] + [1] * (x.dim() - 1)
+                result = torch.cat([sample.repeat(*repeat_args) for sample in samples], dim=0)
+                return result
+
+            for key in dict_to_expand:
+                if key == "pixel_values":
+                    # split images into samples
+                    samples = torch.split(image_grid_thw, list(image_nums))
+                    # compute the sequence length of images for each sample
+                    lengths = [torch.prod(sample, dim=1).sum() for sample in samples]
+                    dict_to_expand[key] = _repeat_interleave_samples(
+                        dict_to_expand[key], lengths=lengths, repeat_times=expand_size
+                    )
+                elif key == "image_grid_thw":
+                    # get the num of images for each sample
+                    lengths = list(image_nums)
+                    dict_to_expand[key] = _repeat_interleave_samples(
+                        dict_to_expand[key], lengths=lengths, repeat_times=expand_size
+                    )
+                elif key == "pixel_values_videos":
+                    samples = torch.split(video_grid_thw, list(video_nums))
+                    lengths = [torch.prod(sample, dim=1).sum() for sample in samples]
+                    dict_to_expand[key] = _repeat_interleave_samples(
+                        dict_to_expand[key], lengths=lengths, repeat_times=expand_size
+                    )
+                elif key == "video_grid_thw":
+                    lengths = list(video_nums)
+                    dict_to_expand[key] = _repeat_interleave_samples(
+                        dict_to_expand[key], lengths=lengths, repeat_times=expand_size
+                    )
+                elif key == "second_per_grid_ts":
+                    dict_to_expand[key] = _repeat_interleave_samples(
+                        dict_to_expand[key], lengths=list(video_nums), repeat_times=expand_size
+                    )
+            return dict_to_expand
+
+        def _expand_dict_for_generation(dict_to_expand):
+            for key in dict_to_expand:
+                if (
+                    key != "cache_position"
+                    and dict_to_expand[key] is not None
+                    and isinstance(dict_to_expand[key], torch.Tensor)
+                    and key not in visual_keys
+                ):
+                    dict_to_expand[key] = dict_to_expand[key].repeat_interleave(expand_size, dim=0)
+            return dict_to_expand
+
+        model_kwargs = _expand_dict_for_generation_visual(model_kwargs)
+
+        if input_ids is not None:
+            input_ids = input_ids.repeat_interleave(expand_size, dim=0)
+
+        model_kwargs = _expand_dict_for_generation(model_kwargs)
+
+        if is_encoder_decoder:
+            if model_kwargs.get("encoder_outputs") is None:
+                raise ValueError("If `is_encoder_decoder` is True, make sure that `encoder_outputs` is defined.")
+            model_kwargs["encoder_outputs"] = _expand_dict_for_generation(model_kwargs["encoder_outputs"])
+
+        return input_ids, model_kwargs
+
+
+__all__ = [
+    "Qwen3VLVisionModel",
+    "Qwen3VLForConditionalGeneration",
+    "Qwen3VLModel",
+    "Qwen3VLPreTrainedModel",
+    "Qwen3VLTextModel",
+]