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data.py
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data.py
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import re
from transformers import GPT2TokenizerFast
from datasets import load_dataset
from itertools import chain
import numpy as np
import torch
import urllib.request
import zipfile
import requests
import json
from datasets import Dataset
from torch.utils.data import DataLoader, DistributedSampler
def cycle_loader(dataloader, sampler=None):
while 1:
if sampler is not None:
sampler.set_epoch(np.random.randint(0, 100000))
for data in dataloader:
yield data
def wt_detokenizer(string):
# contractions
string = string.replace("s '", "s'")
string = re.sub(r"/' [0-9]/", r"/'[0-9]/", string)
# number separators
string = string.replace(" @-@ ", "-")
string = string.replace(" @,@ ", ",")
string = string.replace(" @.@ ", ".")
# punctuation
string = string.replace(" : ", ": ")
string = string.replace(" ; ", "; ")
string = string.replace(" . ", ". ")
string = string.replace(" ! ", "! ")
string = string.replace(" ? ", "? ")
string = string.replace(" , ", ", ")
# double brackets
string = re.sub(r"\(\s*([^\)]*?)\s*\)", r"(\1)", string)
string = re.sub(r"\[\s*([^\]]*?)\s*\]", r"[\1]", string)
string = re.sub(r"{\s*([^}]*?)\s*}", r"{\1}", string)
string = re.sub(r"\"\s*([^\"]*?)\s*\"", r'"\1"', string)
string = re.sub(r"'\s*([^']*?)\s*'", r"'\1'", string)
# miscellaneous
string = string.replace("= = = =", "====")
string = string.replace("= = =", "===")
string = string.replace("= =", "==")
string = string.replace(" " + chr(176) + " ", chr(176))
string = string.replace(" \n", "\n")
string = string.replace("\n ", "\n")
string = string.replace(" N ", " 1 ")
string = string.replace(" 's", "'s")
return string
def ptb_detokenizer(x):
x = x.replace(" 's", "'s")
x = x.replace("s ' ", "s' ")
x = x.replace(" n't", "n't")
x = x.replace(" \n ", "\n")
x = x.replace("\\/", "/")
for _ in range(10):
x = x.replace(" N ", " 1 ")
x = x.replace("$ 1", "$1")
x = x.replace("# 1", "#1")
x = x.replace("<unk>", "?")
return x
def lm1b_detokenizer(x):
x = x.replace('http : / / ', 'http://')
x = x.replace('https : / / ', 'https://')
x = re.sub(r' \'(\w+)', r"'\1", x)
x = re.sub(r' (\w+) \. ', r' \1. ', x)
x = re.sub(r' (\w+) \.$', r' \1.', x)
x = x.replace(' ? ', '? ')
x = re.sub(r' \?$', '?', x)
x = x.replace(' ! ', '! ')
x = re.sub(r' \!$', '!', x)
x = x.replace(' , ', ', ')
x = x.replace(' : ', ': ')
x = x.replace(' ; ', '; ')
x = x.replace(' / ', '/')
x = re.sub(r'\" ([^\"]+) \"', r'"\1"', x)
x = re.sub(r'\' ([^\']+) \'', r"'\1'", x)
x = re.sub(r'\( ([^\(\)]+) \)', r"(\1)", x)
x = re.sub(r'\[ ([^\[\]]+) \]', r"[\1]", x)
x = x.replace('$ ', '$')
x = x.replace('£ ', '£')
return x
def lambada_detokenizer(text):
text = text.replace("“", '"')
text = text.replace("”", '"')
return '\n'+text.strip()
def get_lambada_test_dataset():
url = "https://openaipublic.blob.core.windows.net/gpt-2/data/lambada_test.jsonl"
def read_jsonl_to_list(url):
response = requests.get(url, stream=True)
data_list = []
# Process each line in the response content
for line in response.iter_lines(decode_unicode=True):
if line:
data = json.loads(line)
data_list.append(data)
return data_list
lambada_data = read_jsonl_to_list(url)
dataset = Dataset.from_list(lambada_data)
return dataset
def get_dataset(name, mode, cache_dir=None, block_size=1024, num_proc=8):
if name == "wikitext103":
dataset = load_dataset("wikitext", name="wikitext-103-raw-v1", cache_dir=cache_dir)
elif name == "wikitext2":
dataset = load_dataset("wikitext", name="wikitext-2-raw-v1", cache_dir=cache_dir)
elif name == "ptb":
dataset = load_dataset("ptb_text_only", cache_dir=cache_dir)
elif name == "lambada":
dataset = get_lambada_test_dataset()
else:
dataset = load_dataset(name, cache_dir=cache_dir)
if name == "lambada":
data = dataset
else:
data = dataset[mode]
if name.startswith("wikitext"):
detokenizer = wt_detokenizer
elif name == "ptb":
detokenizer = ptb_detokenizer
elif name == "lm1b":
detokenizer = lm1b_detokenizer
elif name == "lambada":
detokenizer = lambada_detokenizer
else:
detokenizer = None
def _apply_detokenizer(detokenizer):
def detok(text):
for i, t in enumerate(text, 0):
text[i] = detokenizer(t)
return text
return detok
tokenizer = GPT2TokenizerFast.from_pretrained('gpt2')
EOS = tokenizer.encode(tokenizer.eos_token)[0]
def preprocess_and_tokenize(example):
if name == "ptb":
text = example['sentence']
else:
text = example["text"]
# print(list(example.keys()))
# exit()
if detokenizer is not None:
text = _apply_detokenizer(detokenizer)(text)
tokens = tokenizer(text, return_attention_mask=False)
# add in EOS token following
# https://github.com/jcpeterson/openwebtext/blob/master/tokenize_text.py#L67
for token in tokens['input_ids']:
token.append(EOS)
return tokens
tokenized_dataset = data.map(preprocess_and_tokenize, batched=True, num_proc=num_proc, load_from_cache_file=True)
if name == "ptb":
tokenized_dataset = tokenized_dataset.remove_columns('sentence')
else:
tokenized_dataset = tokenized_dataset.remove_columns('text')
def group_texts(examples):
# Concatenate all texts.
concatenated_examples = {k: list(chain(*examples[k])) for k in examples.keys()}
total_length = len(concatenated_examples[list(examples.keys())[0]])
# We drop the small remainder, and if the total_length < block_size we exclude this batch and return an empty dict.
# We could add padding if the model supported it instead of this drop, you can customize this part to your needs.
total_length = (total_length // block_size) * block_size
# Split by chunks of max_len.
result = {
k: [t[i : i + block_size] for i in range(0, total_length, block_size)]
for k, t in concatenated_examples.items()
}
return result
chunked_dataset = tokenized_dataset.map(group_texts, batched=True, num_proc=num_proc, load_from_cache_file=True)
chunked_dataset = chunked_dataset.with_format('torch')
return chunked_dataset
def get_dataloaders(config, distributed=True):
if config.training.batch_size % (config.ngpus * config.training.accum) != 0:
raise ValueError(f"Train Batch Size {config.training.batch_size} is not divisible by {config.ngpus} gpus with accumulation {config.training.accum}.")
if config.eval.batch_size % (config.ngpus * config.training.accum) != 0:
raise ValueError(f"Eval Batch Size for {config.eval.batch_size} is not divisible by {config.ngpus} gpus with accumulation {config.training.accum}.")
train_set = get_dataset(config.data.train, "train", cache_dir=config.data.cache_dir, block_size=config.model.length)
valid_set = get_dataset(config.data.valid, "validation" if config.data.valid != "text8" else "test", cache_dir=config.data.cache_dir, block_size=config.model.length)
if distributed:
train_sampler = DistributedSampler(train_set)
test_sampler = DistributedSampler(valid_set)
else:
train_sampler = None
test_sampler = None
train_loader = cycle_loader(DataLoader(
train_set,
batch_size=config.training.batch_size // (config.ngpus * config.training.accum),
sampler=train_sampler,
num_workers=4,
pin_memory=True,
shuffle=(train_sampler is None),
persistent_workers=True,
))
valid_loader = cycle_loader(DataLoader(
valid_set,
batch_size=config.eval.batch_size // (config.ngpus * config.training.accum),
sampler=test_sampler,
num_workers=4,
pin_memory=True,
shuffle=(test_sampler is None),
))
return train_loader, valid_loader