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43 lines
1.6 KiB
43 lines
1.6 KiB
import json
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import os
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from typing import Optional
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import torch
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from torch.utils.data import Dataset
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from transformers import GPT2Tokenizer
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from colossalai.legacy.registry import DATASETS
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@DATASETS.register_module
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class WebtextDataset(Dataset):
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def __init__(self, path: Optional[str] = None, seq_len=1024) -> None:
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super().__init__()
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if path is not None:
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root = os.path.dirname(path)
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encoded_data_cache_path = os.path.join(root, f"gpt_webtext_{seq_len}.pt")
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if os.path.isfile(encoded_data_cache_path):
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seq_len_, data, attention_mask = torch.load(encoded_data_cache_path)
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if seq_len_ == seq_len:
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self.data = data
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self.attention_mask = attention_mask
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return
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raw_data = []
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with open(path) as f:
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for line in f.readlines():
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raw_data.append(json.loads(line)["text"])
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tokenizer = GPT2Tokenizer.from_pretrained("gpt2")
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tokenizer.pad_token = tokenizer.unk_token
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encoded_data = tokenizer(raw_data, padding=True, truncation=True, max_length=seq_len, return_tensors="pt")
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self.data = encoded_data["input_ids"]
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self.attention_mask = encoded_data["attention_mask"]
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else:
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self.data = torch.randint(0, 50257, (10240, seq_len))
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self.attention_mask = torch.ones_like(self.data)
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def __len__(self):
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return len(self.data)
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def __getitem__(self, index):
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return {"input_ids": self.data[index], "attention_mask": self.attention_mask[index]}, self.data[index]
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