
'''simple docstring'''






import logging
import os
from dataclasses import dataclass, field
from functools import partial
from pathlib import Path
from tempfile import TemporaryDirectory
from typing import List, Optional

import faiss
import torch
from datasets import Features, Sequence, Value, load_dataset

from transformers import (
    DPRContextEncoder,
    DPRContextEncoderTokenizerFast,
    HfArgumentParser,
    RagRetriever,
    RagSequenceForGeneration,
    RagTokenizer,
)


__lowercase	=    logging.getLogger(__name__)
torch.set_grad_enabled(False)
__lowercase	=    '''cuda''' if torch.cuda.is_available() else '''cpu'''







def 		SCREAMING_SNAKE_CASE__					(							_SCREAMING_SNAKE_CASE  ,					_SCREAMING_SNAKE_CASE=100  ,					_SCREAMING_SNAKE_CASE=" "  ):
		lowerCAmelCase_   :       Tuple    							=text.split(_SCREAMING_SNAKE_CASE  )
		return [character.join(text[i : i + n]  ).strip() for i in range(0  ,					len(_SCREAMING_SNAKE_CASE  )  ,					_SCREAMING_SNAKE_CASE  )]







def 		SCREAMING_SNAKE_CASE__					(							_SCREAMING_SNAKE_CASE  ):
		lowerCAmelCase_							,		lowerCAmelCase_   :       Any    							=[], []
		for title, text in zip(documents['''title''']  ,					documents['''text''']  ):
				if text is not None:
						for passage in split_text(_SCREAMING_SNAKE_CASE  ):
								titles.append(title if title is not None else ''''''  )
								texts.append(_SCREAMING_SNAKE_CASE  )
		return {"title": titles, "text": texts}







def 		SCREAMING_SNAKE_CASE__					(							_SCREAMING_SNAKE_CASE  ,					_SCREAMING_SNAKE_CASE  ,					_SCREAMING_SNAKE_CASE  ):
		lowerCAmelCase_   :       Tuple    							=ctx_tokenizer(
		    documents['''title''']  ,					documents['''text''']  ,					truncation=_SCREAMING_SNAKE_CASE  ,					padding='''longest'''  ,					return_tensors='''pt'''  )['''input_ids''']
		lowerCAmelCase_   :       Dict    							=ctx_encoder(input_ids.to(device=_SCREAMING_SNAKE_CASE  )  ,					return_dict=_SCREAMING_SNAKE_CASE  ).pooler_output
		return {"embeddings": embeddings.detach().cpu().numpy()}







def 		SCREAMING_SNAKE_CASE__					(							_SCREAMING_SNAKE_CASE  ,					_SCREAMING_SNAKE_CASE  ,					_SCREAMING_SNAKE_CASE  ,					):
		######################################
		logger.info('''Step 1 - Create the dataset'''  )
		######################################

		# The dataset needed for RAG must have three columns:
		# - title (string): title of the document
		# - text (string): text of a passage of the document
		# - embeddings (array of dimension d): DPR representation of the passage

		# Let's say you have documents in tab-separated csv files with columns "title" and "text"
		assert os.path.isfile(rag_example_args.csv_path  ), "Please provide a valid path to a csv file"

		# You can load a Dataset object this way
		lowerCAmelCase_   :       Union[str, Any]    							=load_dataset(
		    '''csv'''  ,					data_files=[rag_example_args.csv_path]  ,					split='''train'''  ,					delimiter='''\t'''  ,					column_names=['''title''', '''text''']  )

		# More info about loading csv files in the documentation: https://huggingface.co/docs/datasets/loading_datasets.html?highlight=csv#csv-files

		# Then split the documents into passages of 100 words
		lowerCAmelCase_   :       Optional[int]    							=dataset.map(_SCREAMING_SNAKE_CASE  ,					batched=_SCREAMING_SNAKE_CASE  ,					num_proc=processing_args.num_proc  )

		# And compute the embeddings
		lowerCAmelCase_   :       List[Any]    							=DPRContextEncoder.from_pretrained(rag_example_args.dpr_ctx_encoder_model_name  ).to(device=_SCREAMING_SNAKE_CASE  )
		lowerCAmelCase_   :       Optional[int]    							=DPRContextEncoderTokenizerFast.from_pretrained(rag_example_args.dpr_ctx_encoder_model_name  )
		lowerCAmelCase_   :       Optional[int]    							=Features(
		    {'''text''': Value('''string'''  ), '''title''': Value('''string'''  ), '''embeddings''': Sequence(Value('''float32'''  )  )}  )  # optional, save as float32 instead of float64 to save space
		lowerCAmelCase_   :       Optional[Any]    							=dataset.map(
		    partial(_SCREAMING_SNAKE_CASE  ,					ctx_encoder=_SCREAMING_SNAKE_CASE  ,					ctx_tokenizer=_SCREAMING_SNAKE_CASE  )  ,					batched=_SCREAMING_SNAKE_CASE  ,					batch_size=processing_args.batch_size  ,					features=_SCREAMING_SNAKE_CASE  ,					)

		# And finally save your dataset
		lowerCAmelCase_   :       Tuple    							=os.path.join(rag_example_args.output_dir  ,					'''my_knowledge_dataset'''  )
		dataset.save_to_disk(_SCREAMING_SNAKE_CASE  )
		# from datasets import load_from_disk
		# dataset = load_from_disk(passages_path)  # to reload the dataset

		######################################
		logger.info('''Step 2 - Index the dataset'''  )
		######################################

		# Let's use the Faiss implementation of HNSW for fast approximate nearest neighbor search
		lowerCAmelCase_   :       Optional[int]    							=faiss.IndexHNSWFlat(index_hnsw_args.d  ,					index_hnsw_args.m  ,					faiss.METRIC_INNER_PRODUCT  )
		dataset.add_faiss_index('''embeddings'''  ,					custom_index=_SCREAMING_SNAKE_CASE  )

		# And save the index
		lowerCAmelCase_   :       Any    							=os.path.join(rag_example_args.output_dir  ,					'''my_knowledge_dataset_hnsw_index.faiss'''  )
		dataset.get_index('''embeddings'''  ).save(_SCREAMING_SNAKE_CASE  )
		# dataset.load_faiss_index("embeddings", index_path)  # to reload the index

		######################################
		logger.info('''Step 3 - Load RAG'''  )
		######################################

		# Easy way to load the model
		lowerCAmelCase_   :       Dict    							=RagRetriever.from_pretrained(
		    rag_example_args.rag_model_name  ,					index_name='''custom'''  ,					indexed_dataset=_SCREAMING_SNAKE_CASE  )
		lowerCAmelCase_   :       Any    							=RagSequenceForGeneration.from_pretrained(rag_example_args.rag_model_name  ,					retriever=_SCREAMING_SNAKE_CASE  )
		lowerCAmelCase_   :       Any    							=RagTokenizer.from_pretrained(rag_example_args.rag_model_name  )

		# For distributed fine-tuning you'll need to provide the paths instead, as the dataset and the index are loaded separately.
		# retriever = RagRetriever.from_pretrained(rag_model_name, index_name="custom", passages_path=passages_path, index_path=index_path)

		######################################
		logger.info('''Step 4 - Have fun'''  )
		######################################

		lowerCAmelCase_   :       Dict    							=rag_example_args.question or '''What does Moses\' rod turn into ?'''
		lowerCAmelCase_   :       int    							=tokenizer.question_encoder(_SCREAMING_SNAKE_CASE  ,					return_tensors='''pt'''  )['''input_ids''']
		lowerCAmelCase_   :       Any    							=model.generate(_SCREAMING_SNAKE_CASE  )
		lowerCAmelCase_   :       Tuple    							=tokenizer.batch_decode(_SCREAMING_SNAKE_CASE  ,					skip_special_tokens=_SCREAMING_SNAKE_CASE  )[0]
		logger.info('''Q: ''' + question  )
		logger.info('''A: ''' + generated_string  )

@dataclass
class 							_snake_case     :
	"""simple docstring"""





	_UpperCamelCase							:  str								=		field(
	    default=str(Path(lowerCAmelCase_ ).parent / '''test_data''' / '''my_knowledge_dataset.csv''' )						,    metadata={'''help''': '''Path to a tab-separated csv file with columns \'title\' and \'text\''''}						,    )
	_UpperCamelCase							:  Optional[str]								=		field(
	    default=lowerCAmelCase_						,    metadata={'''help''': '''Question that is passed as input to RAG. Default is \'What does Moses\' rod turn into ?\'.'''}						,    )
	_UpperCamelCase							:  str								=		field(
	    default='''facebook/rag-sequence-nq'''						,    metadata={'''help''': '''The RAG model to use. Either \'facebook/rag-sequence-nq\' or \'facebook/rag-token-nq\''''}						,    )
	_UpperCamelCase							:  str								=		field(
	    default='''facebook/dpr-ctx_encoder-multiset-base'''						,    metadata={
	        '''help''': (
	            '''The DPR context encoder model to use. Either \'facebook/dpr-ctx_encoder-single-nq-base\' or'''
	            ''' \'facebook/dpr-ctx_encoder-multiset-base\''''
	        )
	    }						,    )
	_UpperCamelCase							:  Optional[str]								=		field(
	    default=lowerCAmelCase_						,    metadata={'''help''': '''Path to a directory where the dataset passages and the index will be saved'''}						,    )







@dataclass
class 							_snake_case     :
	"""simple docstring"""





	_UpperCamelCase							:  Optional[int]								=		field(
	    default=lowerCAmelCase_						,    metadata={
	        '''help''': '''The number of processes to use to split the documents into passages. Default is single process.'''
	    }						,    )
	_UpperCamelCase							:  int								=		field(
	    default=16						,    metadata={
	        '''help''': '''The batch size to use when computing the passages embeddings using the DPR context encoder.'''
	    }						,    )







@dataclass
class 							_snake_case     :
	"""simple docstring"""





	_UpperCamelCase							:  int								=		field(
	    default=768						,    metadata={'''help''': '''The dimension of the embeddings to pass to the HNSW Faiss index.'''}						,    )
	_UpperCamelCase							:  int								=		field(
	    default=128						,    metadata={
	        '''help''': (
	            '''The number of bi-directional links created for every new element during the HNSW index construction.'''
	        )
	    }						,    )


if __name__ == "__main__":
							logging.basicConfig(level=logging.WARNING)
							logger.setLevel(logging.INFO)

							__lowercase	=    HfArgumentParser((RagExampleArguments, ProcessingArguments, IndexHnswArguments))
							__lowercase	,				__lowercase	,				__lowercase	=    parser.parse_args_into_dataclasses()
							with TemporaryDirectory() as tmp_dir:
														__lowercase	=    rag_example_args.output_dir or tmp_dir
														main(rag_example_args, processing_args, index_hnsw_args)








'''simple docstring'''






from __future__ import annotations







def 		SCREAMING_SNAKE_CASE__					(							_SCREAMING_SNAKE_CASE  ,					_SCREAMING_SNAKE_CASE  ,					_SCREAMING_SNAKE_CASE  ):
		if len(_SCREAMING_SNAKE_CASE  ) == 0:
				raise ValueError('''find_min() arg is an empty sequence'''  )
		if (
		    left >= len(_SCREAMING_SNAKE_CASE  )
		    or left < -len(_SCREAMING_SNAKE_CASE  )
		    or right >= len(_SCREAMING_SNAKE_CASE  )
		    or right < -len(_SCREAMING_SNAKE_CASE  )
		):
				raise IndexError('''list index out of range'''  )
		if left == right:
				return nums[left]
		lowerCAmelCase_   :       Dict    							=(left + right) >> 1  # the middle
		lowerCAmelCase_   :       Optional[int]    							=find_min(_SCREAMING_SNAKE_CASE  ,					_SCREAMING_SNAKE_CASE  ,					_SCREAMING_SNAKE_CASE  )  # find min in range[left, mid]
		lowerCAmelCase_   :       Any    							=find_min(_SCREAMING_SNAKE_CASE  ,					mid + 1  ,					_SCREAMING_SNAKE_CASE  )  # find min in range[mid + 1, right]

		return left_min if left_min <= right_min else right_min


if __name__ == "__main__":
							import doctest

							doctest.testmod(verbose=True)






