246 lines
8.7 KiB
Python
246 lines
8.7 KiB
Python
import json
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import random
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import re
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import pandas as pd
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import numpy as np
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from torch.utils.data import Dataset, DataLoader
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import torch
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from sklearn.model_selection import train_test_split
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import os
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import ast
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os.environ["TOKENIZERS_PARALLELISM"] = "false"
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class PretrainDataset(Dataset):
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def __init__(self, data_path, tokenizer, max_length=512):
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super().__init__()
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self.tokenizer = tokenizer
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self.max_length = max_length
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self.samples = self.load_data(data_path)
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def load_data(self, path):
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samples = []
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with open(path, 'r', encoding='utf-8') as f:
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for line_num, line in enumerate(f, 1):
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data = json.loads(line.strip())
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samples.append(data)
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return samples
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def __len__(self):
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return len(self.samples)
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def __getitem__(self, index):
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sample = self.samples[index]
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# 构建输入文本
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text = f"{self.tokenizer.bos_token}{str(sample['text'])}{self.tokenizer.eos_token}"
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encoding = self.tokenizer(
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text,
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max_length=self.max_length,
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padding='max_length',
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truncation=True,
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return_tensors='pt'
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)
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input_ids = encoding.input_ids.squeeze()
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loss_mask = (input_ids != self.tokenizer.pad_token_id)
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X = torch.tensor(input_ids[:-1], dtype=torch.long)
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Y = torch.tensor(input_ids[1:], dtype=torch.long)
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loss_mask = torch.tensor(loss_mask[1:], dtype=torch.long)
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return X, Y, loss_mask
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class SFTDataset(Dataset):
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def __init__(self, jsonl_path, tokenizer, max_length=1024):
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super().__init__()
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self.tokenizer = tokenizer
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self.max_length = max_length
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self.samples = self.load_data(jsonl_path)
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self.bos_id = tokenizer('<s>assistant', add_special_tokens=False).input_ids
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self.eos_id = tokenizer('</s>', add_special_tokens=False).input_ids
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def __len__(self):
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return len(self.samples)
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def load_data(self, path):
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samples = []
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with open(path, 'r', encoding='utf-8') as f:
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for line_num, line in enumerate(f, 1):
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data = json.loads(line.strip())
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samples.append(data)
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return samples
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def _create_chat_prompt(self, conversations):
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"""构建符合ChatML格式的对话"""
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messages = []
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for i, turn in enumerate(conversations):
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role = 'user' if i % 2 == 0 else 'assistant'
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messages.append({"role": role, "content": turn['content']})
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return self.tokenizer.apply_chat_template(
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messages,
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tokenize=False,
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add_generation_prompt=False
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)
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def _generate_loss_mask(self, input_ids):
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loss_mask = [0] * len(input_ids)
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i = 0
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while i < len(input_ids):
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if input_ids[i:i + len(self.bos_id)] == self.bos_id:
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start = i + len(self.bos_id)
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end = start
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while end < len(input_ids):
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if input_ids[end:end + len(self.eos_id)] == self.eos_id:
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break
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end += 1
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for j in range(start + 1, min(end + len(self.eos_id) + 1, self.max_length)):
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loss_mask[j] = 1
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i = end + len(self.eos_id) if end < len(input_ids) else len(input_ids)
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else:
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i += 1
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return loss_mask
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def __getitem__(self, index):
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sample = self.samples[index]
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# 构建对话提示
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prompt = self._create_chat_prompt(sample['conversations'])
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input_ids = self.tokenizer(prompt).input_ids[:self.max_length]
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input_ids += [self.tokenizer.pad_token_id] * (self.max_length - len(input_ids))
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# 生成动态损失掩码
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loss_mask = self._generate_loss_mask(input_ids)
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# 构建训练数据
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X = torch.tensor(input_ids[:-1], dtype=torch.long)
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Y = torch.tensor(input_ids[1:], dtype=torch.long)
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loss_mask = torch.tensor(loss_mask[1:], dtype=torch.long) # 对齐预测位置
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return X, Y, loss_mask
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class DPODataset(Dataset):
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def __init__(self, file_path, tokenizer, max_length=4096):
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super().__init__()
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self.tokenizer = tokenizer
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self.max_length = max_length
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self.padding = tokenizer.pad_token_id if tokenizer.pad_token_id is not None else 0
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self.bos_id = tokenizer('<s>assistant', add_special_tokens=False).input_ids
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self.eos_id = tokenizer('</s>', add_special_tokens=False).input_ids
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with open(file_path, 'r', encoding='utf-8') as f:
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self.data = []
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for line in f:
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line = line.strip()
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obj = json.loads(line)
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self.data.append(obj)
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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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item = self.data[index]
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chosen = item['chosen'] # 是一个 list，里面包含若干 {role, content}
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rejected = item['rejected'] # 同上
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chosen_prompt = self.tokenizer.apply_chat_template(
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chosen, tokenize=False, add_generation_prompt=False
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)
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rejected_prompt = self.tokenizer.apply_chat_template(
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rejected, tokenize=False, add_generation_prompt=False
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)
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chosen_encoding = self.tokenizer(
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chosen_prompt, truncation=True, max_length=self.max_length, padding='max_length'
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)
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rejected_encoding = self.tokenizer(
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rejected_prompt, truncation=True, max_length=self.max_length, padding='max_length'
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)
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chosen_input_ids = chosen_encoding['input_ids']
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chosen_loss_mask = self._generate_loss_mask(chosen_input_ids)
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rejected_input_ids = rejected_encoding['input_ids']
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rejected_loss_mask = self._generate_loss_mask(rejected_input_ids)
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x_chosen = torch.tensor(chosen_input_ids[:-1], dtype=torch.long)
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y_chosen = torch.tensor(chosen_input_ids[1:], dtype=torch.long)
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mask_chosen = torch.tensor(chosen_loss_mask[1:], dtype=torch.long)
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x_rejected = torch.tensor(rejected_input_ids[:-1], dtype=torch.long)
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y_rejected = torch.tensor(rejected_input_ids[1:], dtype=torch.long)
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mask_rejected = torch.tensor(rejected_loss_mask[1:], dtype=torch.long)
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return {
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'x_chosen': x_chosen,
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'y_chosen': y_chosen,
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'mask_chosen': mask_chosen,
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'x_rejected': x_rejected,
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'y_rejected': y_rejected,
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'mask_rejected': mask_rejected
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}
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def _generate_loss_mask(self, input_ids):
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loss_mask = [0] * len(input_ids)
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i = 0
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while i < len(input_ids):
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if input_ids[i:i + len(self.bos_id)] == self.bos_id:
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start = i + len(self.bos_id)
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end = start
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while end < len(input_ids):
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if input_ids[end:end + len(self.eos_id)] == self.eos_id:
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break
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end += 1
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for j in range(start + 1, min(end + len(self.eos_id) + 1, self.max_length)):
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loss_mask[j] = 1
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i = end + len(self.eos_id) if end < len(input_ids) else len(input_ids)
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else:
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i += 1
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return loss_mask
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class RLAIFDataset(Dataset):
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def __init__(self, jsonl_path, tokenizer, max_length=1024):
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super().__init__()
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self.tokenizer = tokenizer
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self.max_length = max_length
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self.samples = self.load_data(jsonl_path)
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self.bos_id = tokenizer('<s>assistant', add_special_tokens=False).input_ids
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self.eos_id = tokenizer('</s>', add_special_tokens=False).input_ids
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def __len__(self):
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return len(self.samples)
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def load_data(self, path):
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samples = []
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with open(path, 'r', encoding='utf-8') as f:
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for line_num, line in enumerate(f, 1):
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data = json.loads(line.strip())
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samples.append(data)
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return samples
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def _create_chat_prompt(self, conversations):
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"""构建符合ChatML格式的对话"""
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messages = []
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answer = ''
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for i, turn in enumerate(conversations):
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role = 'user' if i % 2 == 0 else 'assistant'
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messages.append({"role": role, "content": turn['content']})
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answer = turn['content']
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return self.tokenizer.apply_chat_template(
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messages[:-1],
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tokenize=False,
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add_generation_prompt=True
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), answer
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def __getitem__(self, index):
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sample = self.samples[index]
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# 构建对话提示
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prompt, answer = self._create_chat_prompt(sample['conversations'])
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return {
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'prompt': prompt,
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'answer': answer
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}
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if __name__ == "__main__":
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pass
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