




import numpy as np
import torch
from torch.nn import CrossEntropyLoss
from transformers import AutoModelForCausalLM, AutoTokenizer

import datasets
from datasets import logging


_lowerCAmelCase  :      Any						=      "\\n\n"

_lowerCAmelCase  :      Optional[int]						=      "\nPerplexity (PPL) is one of the most common metrics for evaluating language models.\nIt is defined as the exponentiated average negative log-likelihood of a sequence.\n\nFor more information, see https://huggingface.co/docs/transformers/perplexity\n"

_lowerCAmelCase  :      int						=      "\nArgs:\n    model_id (str): model used for calculating Perplexity\n            NOTE: Perplexity can only be calculated for causal language models.\n                    This includes models such as gpt2, causal variations of bert,\n                    causal versions of t5, and more (the full list can be found\n                    in the AutoModelForCausalLM documentation here:\n                    https://huggingface.co/docs/transformers/master/en/model_doc/auto#transformers.AutoModelForCausalLM )\n\n    input_texts (list of str): input text, each separate text snippet\n        is one list entry.\n    batch_size (int): the batch size to run texts through the model. Defaults to 16.\n    add_start_token (bool): whether to add the start token to the texts,\n        so the perplexity can include the probability of the first word. Defaults to True.\n    device (str): device to run on, defaults to \'cuda\' when available\nReturns:\n    perplexity: dictionary containing the perplexity scores for the texts\n        in the input list, as well as the mean perplexity. If one of the input texts is\n        longer than the max input length of the model, then it is truncated to the\n        max length for the perplexity computation.\nExamples:\n    Example 1:\n        >>> perplexity = datasets.load_metric(\"perplexity\")\n        >>> input_texts = [\"lorem ipsum\", \"Happy Birthday!\", \"Bienvenue\"]\n        >>> results = perplexity.compute(model_id=\'gpt2\',\n        ...                              add_start_token=False,\n        ...                              input_texts=input_texts) # doctest:+ELLIPSIS\n        >>> print(list(results.keys()))\n        [\'perplexities\', \'mean_perplexity\']\n        >>> print(round(results[\"mean_perplexity\"], 2))\n        78.22\n        >>> print(round(results[\"perplexities\"][0], 2))\n        11.11\n\n    Example 2:\n        >>> perplexity = datasets.load_metric(\"perplexity\")\n        >>> input_texts = datasets.load_dataset(\"wikitext\",\n        ...                                     \"wikitext-2-raw-v1\",\n        ...                                     split=\"test\")[\"text\"][:50] # doctest:+ELLIPSIS\n        [...]\n        >>> input_texts = [s for s in input_texts if s!=\'\']\n        >>> results = perplexity.compute(model_id=\'gpt2\',\n        ...                              input_texts=input_texts) # doctest:+ELLIPSIS\n        >>> print(list(results.keys()))\n        [\'perplexities\', \'mean_perplexity\']\n        >>> print(round(results[\"mean_perplexity\"], 2))\n        60.35\n        >>> print(round(results[\"perplexities\"][0], 2))\n        81.12\n"
@datasets.utils.file_utils.add_start_docstrings(_DESCRIPTION		,				_KWARGS_DESCRIPTION						)
class 	_UpperCamelCase					( datasets.Metric						):
      def 		UpperCAmelCase_  (	self      :Any					)   ->	Tuple:
       return datasets.MetricInfo(
           description=_DESCRIPTION       ,					citation=_CITATION       ,					inputs_description=_KWARGS_DESCRIPTION       ,					features=datasets.Features(
               {
                   "input_texts": datasets.Value("string"					),
               }					)       ,					reference_urls=["https://huggingface.co/docs/transformers/perplexity"]       ,					)







      def 		UpperCAmelCase_  (	self      :Dict       ,					lowerCamelCase      :Tuple       ,					lowerCamelCase      :Optional[int]       ,					lowerCamelCase      :int = 16       ,					lowerCamelCase      :bool = True       ,					lowerCamelCase      :List[Any]=None					)   ->	List[Any]:







       if device is not None:
        assert device in ["gpu", "cpu", "cuda"], "device should be either gpu or cpu."
        if device == "gpu":
         UpperCAmelCase__							       =  "cuda"
       else:
        UpperCAmelCase__							       =  "cuda" if torch.cuda.is_available() else "cpu"

       UpperCAmelCase__							       =  AutoModelForCausalLM.from_pretrained(UpperCamelCase_					)
       UpperCAmelCase__							       =  model.to(UpperCamelCase_					)

       UpperCAmelCase__							       =  AutoTokenizer.from_pretrained(UpperCamelCase_					)

       # if batch_size > 1 (which generally leads to padding being required), and
       # if there is not an already assigned pad_token, assign an existing
       # special token to also be the padding token
       if tokenizer.pad_token is None and batch_size > 1:
        UpperCAmelCase__							       =  list(tokenizer.special_tokens_map_extended.values()					)
        # check that the model already has at least one special token defined
        assert (
            len(UpperCamelCase_					) > 0
        ), "If batch_size > 1, model must have at least one special token to use for padding. Please use a different model or set batch_size=1."
        # assign one of the special tokens to also be the pad token
        tokenizer.add_special_tokens({"pad_token": existing_special_tokens[0]}					)

       if add_start_token:
        # leave room for <BOS> token to be added:
        assert (
            tokenizer.bos_token is not None
        ), "Input model must already have a BOS token if using add_start_token=True. Please use a different model, or set add_start_token=False"
        UpperCAmelCase__							       =  model.config.max_length - 1
       else:
        UpperCAmelCase__							       =  model.config.max_length

       UpperCAmelCase__							       =  tokenizer(
           UpperCamelCase_       ,					add_special_tokens=UpperCamelCase_       ,					padding=UpperCamelCase_       ,					truncation=UpperCamelCase_       ,					max_length=UpperCamelCase_       ,					return_tensors="pt"       ,					return_attention_mask=UpperCamelCase_       ,					).to(UpperCamelCase_					)

       UpperCAmelCase__							       =  encodings["input_ids"]
       UpperCAmelCase__							       =  encodings["attention_mask"]

       # check that each input is long enough:
       if add_start_token:
        assert torch.all(torch.ge(attn_masks.sum(1					)       ,					1					)					), "Each input text must be at least one token long."
       else:
        assert torch.all(
            torch.ge(attn_masks.sum(1					)       ,					2					)					), "When add_start_token=False, each input text must be at least two tokens long. Run with add_start_token=True if inputting strings of only one token, and remove all empty input strings."

       UpperCAmelCase__							       =  []
       UpperCAmelCase__							       =  CrossEntropyLoss(reduction="none"					)

       for start_index in logging.tqdm(range(0       ,					len(UpperCamelCase_					)       ,					UpperCamelCase_					)					):
        UpperCAmelCase__							       =  min(start_index + batch_size       ,					len(UpperCamelCase_					)					)
        UpperCAmelCase__							       =  encoded_texts[start_index:end_index]
        UpperCAmelCase__							       =  attn_masks[start_index:end_index]

        if add_start_token:
         UpperCAmelCase__							       =  torch.tensor([[tokenizer.bos_token_id]] * encoded_batch.size(dim=0					)					).to(UpperCamelCase_					)
         UpperCAmelCase__							       =  torch.cat([bos_tokens_tensor, encoded_batch]       ,					dim=1					)
         UpperCAmelCase__							       =  torch.cat(
             [torch.ones(bos_tokens_tensor.size()       ,					dtype=torch.intaa					).to(UpperCamelCase_					), attn_mask]       ,					dim=1					)

        UpperCAmelCase__							       =  encoded_batch

        with torch.no_grad():
         UpperCAmelCase__							       =  model(UpperCamelCase_       ,					attention_mask=UpperCamelCase_					).logits

        UpperCAmelCase__							       =  out_logits[..., :-1, :].contiguous()
        UpperCAmelCase__							       =  labels[..., 1:].contiguous()
        UpperCAmelCase__							       =  attn_mask[..., 1:].contiguous()

        UpperCAmelCase__							       =  torch.expa(
            (loss_fct(shift_logits.transpose(1       ,					2					)       ,					UpperCamelCase_					) * shift_attention_mask_batch).sum(1					)
            / shift_attention_mask_batch.sum(1					)					)

        ppls += perplexity_batch.tolist()

       return {"perplexities": ppls, "mean_perplexity": np.mean(UpperCamelCase_					)}









import os
import re
import shutil
from argparse import ArgumentParser, Namespace

from datasets.commands import BaseDatasetsCLICommand
from datasets.utils.logging import get_logger


lowerCAmelCase       =							'<<<<<<< This should probably be modified because it mentions: '

lowerCAmelCase       =							'=======\n>>>>>>>\n'

lowerCAmelCase       =							[
    'TextEncoderConfig',
    'ByteTextEncoder',
    'SubwordTextEncoder',
    'encoder_config',
    'maybe_build_from_corpus',
    'manual_dir',
]

lowerCAmelCase       =							[
    # (pattern, replacement)
    # Order is important here for some replacements
    (R'tfds\.core', R'datasets'),
    (R'tf\.io\.gfile\.GFile', R'open'),
    (R'tf\.([\w\d]+)', R'datasets.Value(\'\1\')'),
    (R'tfds\.features\.Text\(\)', R'datasets.Value(\'string\')'),
    (R'tfds\.features\.Text\(', R'datasets.Value(\'string\'),'),
    (R'features\s*=\s*tfds.features.FeaturesDict\(', R'features=datasets.Features('),
    (R'tfds\.features\.FeaturesDict\(', R'dict('),
    (R'The TensorFlow Datasets Authors', R'The TensorFlow Datasets Authors and the HuggingFace Datasets Authors'),
    (R'tfds\.', R'datasets.'),
    (R'dl_manager\.manual_dir', R'self.config.data_dir'),
    (R'self\.builder_config', R'self.config'),
]
def 			_a (      SCREAMING_SNAKE_CASE     ):


		"""simple docstring"""




		return ConvertCommand(args.tfds_path						,				args.datasets_directory     )


class        _a							(			UpperCamelCase__			):

							@staticmethod
							def       lowerCamelCase_ (							UpperCamelCase_:	ArgumentParser							)			->   int:





									"""simple docstring"""







									lowercase__            =      parser.add_parser(
									    '''convert'''    ,						help='''Convert a TensorFlow Datasets dataset to a HuggingFace Datasets dataset.'''    ,						)
									train_parser.add_argument(
									    '''--tfds_path'''    ,						type=UpperCamelCase_    ,						required=UpperCamelCase_    ,						help='''Path to a TensorFlow Datasets folder to convert or a single tfds file to convert.'''    ,						)
									train_parser.add_argument(
									    '''--datasets_directory'''    ,						type=UpperCamelCase_    ,						required=UpperCamelCase_    ,						help='''Path to the HuggingFace Datasets folder.'''							)
									train_parser.set_defaults(func=UpperCamelCase_							)

							def __init__(							self:	int    ,						UpperCamelCase_:	str    ,						UpperCamelCase_:	str    ,						*UpperCamelCase_:	Optional[int]							)			->   Union[str, Any]:





									"""simple docstring"""







									lowercase__            =      get_logger('''datasets-cli/converting'''							)

									lowercase__            =      tfds_path
									lowercase__            =      datasets_directory


							def       lowerCamelCase_ (							self:	int							)			->   Optional[int]:





									"""simple docstring"""







									if os.path.isdir(self._tfds_path							):
											lowercase__            =      os.path.abspath(self._tfds_path							)
									elif os.path.isfile(self._tfds_path							):
											lowercase__            =      os.path.dirname(self._tfds_path							)
									else:
											raise ValueError('''--tfds_path is neither a directory nor a file. Please check path.'''							)

									lowercase__            =      os.path.abspath(self._datasets_directory							)

									self._logger.info(f'Converting datasets from {abs_tfds_path} to {abs_datasets_path}'							)

									lowercase__            =      []
									lowercase__            =      []
									lowercase__            =      {}

									if os.path.isdir(self._tfds_path							):
											lowercase__            =      os.listdir(UpperCamelCase_							)
									else:
											lowercase__            =      [os.path.basename(self._tfds_path							)]

									for f_name in file_names:
											self._logger.info(f'Looking at file {f_name}'							)
											lowercase__            =      os.path.join(UpperCamelCase_    ,						UpperCamelCase_							)
											lowercase__            =      os.path.join(UpperCamelCase_    ,						UpperCamelCase_							)

											if not os.path.isfile(UpperCamelCase_							) or "__init__" in f_name or "_test" in f_name or ".py" not in f_name:
													self._logger.info('''Skipping file'''							)
													continue

											with open(UpperCamelCase_    ,						encoding='''utf-8'''							) as f:
													lowercase__            =      f.readlines()

											lowercase__            =      []
											lowercase__            =      False
											lowercase__            =      False
											lowercase__            =      []
											for line in lines:
													lowercase__            =      line

													# Convert imports
													if "import tensorflow.compat.v2 as tf" in out_line:
															continue
													elif "@tfds.core" in out_line:
															continue
													elif "builder=self" in out_line:
															continue
													elif "import tensorflow_datasets.public_api as tfds" in out_line:
															lowercase__            =      '''import datasets\n'''
													elif "import tensorflow" in out_line:
															# order is important here
															lowercase__            =      ''''''
															continue
													elif "from absl import logging" in out_line:
															lowercase__            =      '''from datasets import logging\n'''
													elif "getLogger" in out_line:
															lowercase__            =      out_line.replace('''getLogger'''    ,						'''get_logger'''							)
													elif any(expression in out_line for expression in TO_HIGHLIGHT							):
															lowercase__            =      True
															lowercase__            =      list(filter(lambda UpperCamelCase_							: e in out_line    ,						UpperCamelCase_							)							)
															out_lines.append(HIGHLIGHT_MESSAGE_PRE + str(UpperCamelCase_							) + '''\n'''							)
															out_lines.append(UpperCamelCase_							)
															out_lines.append(UpperCamelCase_							)
															continue
													else:
															for pattern, replacement in TO_CONVERT:
																	lowercase__            =      re.sub(UpperCamelCase_    ,						UpperCamelCase_    ,						UpperCamelCase_							)

                # Take care of saving utilities (to later move them together with main script)
													if "tensorflow_datasets" in out_line:
															lowercase__            =      re.match(r'''from\stensorflow_datasets.*import\s([^\.\r\n]+)'''    ,						UpperCamelCase_							)
															tfds_imports.extend(imp.strip() for imp in match.group(1							).split(''','''							)							)
															lowercase__            =      '''from . import ''' + match.group(1							)

													# Check we have not forget anything
													if "tf." in out_line or "tfds." in out_line or "tensorflow_datasets" in out_line:
															raise ValueError(f'Error converting {out_line.strip()}'							)

													if "GeneratorBasedBuilder" in out_line or "BeamBasedBuilder" in out_line:
															lowercase__            =      True
													out_lines.append(UpperCamelCase_							)

											if is_builder or "wmt" in f_name:
													# We create a new directory for each dataset
													lowercase__            =      f_name.replace('''.py'''    ,						''''''							)
													lowercase__            =      os.path.join(UpperCamelCase_    ,						UpperCamelCase_							)
													lowercase__            =      os.path.join(UpperCamelCase_    ,						UpperCamelCase_							)
													os.makedirs(UpperCamelCase_    ,						exist_ok=UpperCamelCase_							)
													self._logger.info(f'Adding directory {output_dir}'							)
													imports_to_builder_map.update({imp: output_dir for imp in tfds_imports}							)
											else:
													# Utilities will be moved at the end
													utils_files.append(UpperCamelCase_							)

											if needs_manual_update:
													with_manual_update.append(UpperCamelCase_							)

											with open(UpperCamelCase_    ,						'''w'''    ,						encoding='''utf-8'''							) as f:
													f.writelines(UpperCamelCase_							)
											self._logger.info(f'Converted in {output_file}'							)

									for utils_file in utils_files:
											try:
													lowercase__            =      os.path.basename(UpperCamelCase_							)
													lowercase__            =      imports_to_builder_map[f_name.replace('''.py'''    ,						''''''							)]
													self._logger.info(f'Moving {dest_folder} to {utils_file}'							)
													shutil.copy(UpperCamelCase_    ,						UpperCamelCase_							)
											except KeyError:
													self._logger.error(f'Cannot find destination folder for {utils_file}. Please copy manually.'							)

									if with_manual_update:
											for file_path in with_manual_update:
													self._logger.warning(
													    f'You need to manually update file {file_path} to remove configurations using \'TextEncoderConfig\'.'							)


