




from math import sqrt

import numpy as np
from sympy import symbols

# Coefficient
# Speed of light (m/s)
UpperCamelCase								=	2_9979_2458

# Symbols
UpperCamelCase		,    UpperCamelCase		,    UpperCamelCase		,    UpperCamelCase								=	symbols('ct x y z')



def 				_A  (		lowerCAmelCase_	:   float     ):
     """simple docstring"""

     if velocity > c:
          raise ValueError("Speed must not exceed light speed 299,792,458 [m/s]!"     )
     elif velocity < 1:
          # Usually the speed should be much higher than 1 (c order of magnitude)
          raise ValueError("Speed must be greater than or equal to 1!"     )

     return velocity / c



def 				_A  (		lowerCAmelCase_	:   float     ):
     """simple docstring"""

     return 1 / sqrt(1 - beta(lowerCAmelCase_     ) ** 2     )



def 				_A  (		lowerCAmelCase_	:   float     ):
     """simple docstring"""

     return np.array(
         [
             [gamma(lowerCAmelCase_     ), -gamma(lowerCAmelCase_     ) * beta(lowerCAmelCase_     ), 0, 0],
             [-gamma(lowerCAmelCase_     ) * beta(lowerCAmelCase_     ), gamma(lowerCAmelCase_     ), 0, 0],
             [0, 0, 1, 0],
             [0, 0, 0, 1],
         ]     )



def 				_A  (		lowerCAmelCase_	:   float  ,							lowerCAmelCase_	:   np.ndarray | None = None     ):
     """simple docstring"""

     if event is None:
          lowerCAmelCase__            =					np.array([ct, x, y, z]     )  # Symbolic four vector
     else:
          event[0] *= c  # x0 is ct (speed of light * time)

     return transformation_matrix(lowerCAmelCase_     ) @ event


if __name__ == "__main__":
     import doctest

     doctest.testmod()

     # Example of symbolic vector:
     UpperCamelCase								=	transform(2997_9245)
     print('Example of four vector: ')
     print(F"""ct' = {four_vector[0]}""")
     print(F"""x' = {four_vector[1]}""")
     print(F"""y' = {four_vector[2]}""")
     print(F"""z' = {four_vector[3]}""")

     # Substitute symbols with numerical values
     UpperCamelCase								=	{ct: c, x: 1, y: 1, z: 1}
     UpperCamelCase								=	[four_vector[i].subs(sub_dict) for i in range(4)]

     print(F"""\n{numerical_vector}""")




import argparse
import logging
import os

import datasets
import tensorflow as tf

from transformers import AutoTokenizer


UpperCAmelCase   :    Any     =		logging.getLogger(__name__)






def 	__lowerCamelCase						(							):





			'''simple docstring'''




			lowerCamelCase    		=  argparse.ArgumentParser(
			    description="""Prepare TFRecord shards from pre-tokenized samples of the wikitext dataset."""      )
			parser.add_argument(
			    """--dataset_name"""  ,							type=lowerCamelCase__  ,							default="""wikitext"""  ,							help="""Name of the training. Explore datasets at: hf.co/datasets."""  ,							)
			parser.add_argument(
			    """--dataset_config"""  ,							type=lowerCamelCase__  ,							default="""wikitext-103-raw-v1"""  ,							help="""Configuration name of the dataset."""      )
			parser.add_argument(
			    """--tokenizer_name_or_path"""  ,							type=lowerCamelCase__  ,							default="""sayakpaul/unigram-tokenizer-wikitext"""  ,							help="""Tokenizer identifier. Can be a local filepath or a Hub identifier."""  ,							)
			parser.add_argument(
			    """--shard_size"""  ,							type=lowerCamelCase__  ,							default=1000  ,							help="""Number of entries to go in a single shard."""  ,							)
			parser.add_argument("""--split"""  ,							type=lowerCamelCase__  ,							default="""train"""  ,							choices=["""train""", """test""", """validation"""]      )
			parser.add_argument(
			    """--limit"""  ,							default=lowerCamelCase__  ,							type=lowerCamelCase__  ,							help="""Limit the number of shards (used for debugging)."""  ,							)
			parser.add_argument(
			    """--max_length"""  ,							type=lowerCamelCase__  ,							default=512  ,							help="""Maximum sequence length. For training on TPUs, it helps to have a maximum"""
			    """ sequence length that is a multiple of 8."""  ,							)
			parser.add_argument(
			    """--output_dir"""  ,							default="""tf-tpu"""  ,							type=lowerCamelCase__  ,							help="""Output directory where the TFRecord shards will be saved. If the"""
			    """ path is appended with `gs://` ('gs://tf-tpu', for example) then the TFRecord"""
			    """ shards will be directly saved to a Google Cloud Storage bucket."""  ,							)

			lowerCamelCase    		=  parser.parse_args()
			return args






def 	__lowerCamelCase						(							lowerCamelCase__		:						Any      ):





			'''simple docstring'''




			def fn(lowerCamelCase__		:						Any      ):
						return tokenizer(examples["""text"""]      )

			return fn






def 	__lowerCamelCase						(							lowerCamelCase__		:						Optional[int]      ):





			'''simple docstring'''




			lowerCamelCase    		=  []
			for i in range(len(tokenized_data["""input_ids"""]      )      ):
						lowerCamelCase    		=  {
						    """input_ids""": tf.train.Feature(intaa_list=tf.train.IntaaList(value=tokenized_data["""input_ids"""][i]      )      ),
						    """attention_mask""": tf.train.Feature(
						        intaa_list=tf.train.IntaaList(value=tokenized_data["""attention_mask"""][i]      )      ),
						}
						lowerCamelCase    		=  tf.train.Features(feature=lowerCamelCase__      )
						lowerCamelCase    		=  tf.train.Example(features=lowerCamelCase__      )
						lowerCamelCase    		=  example.SerializeToString()
						records.append(lowerCamelCase__      )
			return records






def 	__lowerCamelCase						(							lowerCamelCase__		:						str      ):





			'''simple docstring'''




			lowerCamelCase    		=  datasets.load_dataset(args.dataset_name  ,							args.dataset_config  ,							split=args.split      )

			if args.limit is not None:
						lowerCamelCase    		=  min(len(lowerCamelCase__      )  ,							args.limit      )
						lowerCamelCase    		=  dataset.select(range(lowerCamelCase__      )      )
						print(f'Limiting the dataset to {args.limit} entries.'      )

			lowerCamelCase    		=  AutoTokenizer.from_pretrained(args.tokenizer_name_or_path      )

			# Handle output directory creation.
			# For serializing into a Google Cloud Storage Bucket, one needs to first
			# create a bucket.
			if "gs" not in args.output_dir:
						if not os.path.exists(args.output_dir      ):
									os.makedirs(args.output_dir      )
						lowerCamelCase    		=  os.path.join(args.output_dir  ,							args.split      )
						if not os.path.exists(lowerCamelCase__      ):
									os.makedirs(lowerCamelCase__      )
			else:
						lowerCamelCase    		=  os.path.join(args.output_dir  ,							args.split      )

			# Tokenize the whole dataset at once.
			lowerCamelCase    		=  tokenize_function(lowerCamelCase__      )
			lowerCamelCase    		=  dataset.map(lowerCamelCase__  ,							batched=lowerCamelCase__  ,							num_proc=4  ,							remove_columns=["""text"""]      )

			# We need to concatenate all our texts together, and then split the result
			# into chunks of a fixed size, which we will call block_size. To do this, we
			# will use the map method again, with the option batched=True. When we use batched=True,
			# the function we pass to map() will be passed multiple inputs at once, allowing us
			# to group them into more or fewer examples than we had in the input.
			# This allows us to create our new fixed-length samples. The advantage of this
			# method is that we don't lose a whole lot of content from the dataset compared to the
			# case where we simply tokenize with a pre-defined max_length.

			def group_texts(lowerCamelCase__		:						List[str]      ):
						# Concatenate all texts.
						lowerCamelCase    		=  {k: sum(examples[k]  ,							[]      ) for k in examples.keys()}
						lowerCamelCase    		=  len(concatenated_examples[list(examples.keys()      )[0]]      )
						# We drop the small remainder, though you could add padding instead if the model supports it
						# In this, as in all things, we advise you to follow your heart 🫀
						lowerCamelCase    		=  (total_length // args.max_length) * args.max_length
						# Split by chunks of max_len.
						lowerCamelCase    		=  {
						    k: [t[i : i + args.max_length] for i in range(0  ,							lowerCamelCase__  ,							args.max_length      )]
						    for k, t in concatenated_examples.items()
						}
						return result

			lowerCamelCase    		=  dataset_tokenized.map(lowerCamelCase__  ,							batched=lowerCamelCase__  ,							batch_size=1000  ,							num_proc=4      )

			lowerCamelCase    		=  0
			lowerCamelCase    		=  0
			for shard in range(0  ,							len(lowerCamelCase__      )  ,							args.shard_size      ):
						lowerCamelCase    		=  grouped_dataset[shard : shard + args.shard_size]
						lowerCamelCase    		=  len(dataset_snapshot["""input_ids"""]      )
						lowerCamelCase    		=  os.path.join(lowerCamelCase__  ,							f'dataset-{shard_count}-{records_containing}.tfrecord'      )
						lowerCamelCase    		=  get_serialized_examples(lowerCamelCase__      )

						with tf.io.TFRecordWriter(lowerCamelCase__      ) as out_file:
									for i in range(len(lowerCamelCase__      )      ):
												lowerCamelCase    		=  serialized_examples[i]
												out_file.write(lowerCamelCase__      )
									print("""Wrote file {} containing {} records""".format(lowerCamelCase__  ,							lowerCamelCase__      )      )

						shard_count += 1
						total_records += records_containing

			with open(f'split-{args.split}-records-count.txt'  ,							"""w"""      ) as f:
						print(f'Total {args.split} records: {total_records}'  ,							file=lowerCamelCase__      )


if __name__ == "__main__":
		UpperCAmelCase   :    Optional[int]     =		parse_args()
		main(args)

