优化打乱逻辑并提升数据处理效率
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@ -1,6 +1,6 @@
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import random
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import re
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from typing import Any, Dict, List, Tuple
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import os
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import numpy as np
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import torch
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@ -11,6 +11,8 @@ from pypinyin import lazy_pinyin
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from torch.utils.data import DataLoader, IterableDataset
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os.environ["TOKENIZERS_PARALLELISM"] = "false"
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class PinyinInputDataset(IterableDataset):
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"""
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拼音输入法模拟数据集
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@ -70,7 +72,6 @@ class PinyinInputDataset(IterableDataset):
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# 打乱相关参数
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self.shuffle = shuffle
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self.shuffle_buffer_size = shuffle_buffer_size
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self.shuffle_buffer = []
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# 削峰填谷参数
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self.max_freq = max_freq
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@ -87,18 +88,12 @@ class PinyinInputDataset(IterableDataset):
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stats = query_engine.get_statistics()
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self.total_chars = stats.get("valid_input_character_count", 0)
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# 汉字正则表达式
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self.chinese_pattern = re.compile(r"[\u4e00-\u9fff]")
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# 缓存字典
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self.char_info_cache = {}
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# 加载数据集
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self.dataset = load_dataset(data_dir, split="train", streaming=True)
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def is_chinese_char(self, char: str) -> bool:
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"""判断是否为中文字符"""
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return bool(self.chinese_pattern.match(char))
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def get_next_chinese_chars(
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self,
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@ -126,7 +121,7 @@ class PinyinInputDataset(IterableDataset):
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break
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char = text[i]
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if self.is_chinese_char(char):
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if self.query_engine.is_chinese_char(char):
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# 获取拼音（注意：这里需要确保拼音列表长度与text一致）
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try:
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# 重新计算整个text的拼音可能效率低，但确保准确
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@ -430,21 +425,16 @@ class PinyinInputDataset(IterableDataset):
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return batch_samples
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def _shuffle_and_yield(self, batch_samples):
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"""打乱并yield样本"""
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"""优化打乱逻辑"""
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if not self.shuffle:
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for sample in batch_samples:
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yield sample
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yield from batch_samples
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return
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# 添加到打乱缓冲区
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self.shuffle_buffer.extend(batch_samples)
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# 如果缓冲区达到指定大小，打乱并输出
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if len(self.shuffle_buffer) >= self.shuffle_buffer_size:
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random.shuffle(self.shuffle_buffer)
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for sample in self.shuffle_buffer:
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yield sample
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self.shuffle_buffer = []
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# 使用numpy批量操作代替random.shuffle
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if batch_samples:
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indices = np.random.permutation(len(batch_samples))
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for idx in indices:
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yield batch_samples[idx]
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def __iter__(self):
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"""
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@ -464,9 +454,6 @@ class PinyinInputDataset(IterableDataset):
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random.seed(seed % (2**32))
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np.random.seed(seed % (2**32))
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# 重置打乱缓冲区
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self.shuffle_buffer = []
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for item in self.dataset:
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text = item.get(self.text_field, "")
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if not text:
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@ -474,13 +461,19 @@ class PinyinInputDataset(IterableDataset):
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# 转换为拼音列表
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pinyin_list = lazy_pinyin(text, errors=lambda x: [c for c in x])
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# 批量收集需要查询的字符信息
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chinese_positions = [
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i for i, char in enumerate(text)
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if self.query_engine.is_chinese_char(char)
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]
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# 批量收集需要查询的字符信息
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char_pinyin_batch = []
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char_positions = [] # 保存字符位置和上下文信息
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# 遍历文本中的每个字符
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for i, (char, py) in enumerate(zip(text, pinyin_list)):
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if not self.is_chinese_char(char):
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continue
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char_positions = []
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for i in chinese_positions: # 只遍历中文字符位置
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char = text[i]
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py = pinyin_list[i]
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# 获取后续最多3个中文字符的拼音
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next_chars = self.get_next_chinese_chars(
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@ -518,12 +511,6 @@ class PinyinInputDataset(IterableDataset):
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)
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yield from self._shuffle_and_yield(batch_samples)
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# 清空缓冲区（处理完所有数据后）
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if self.shuffle_buffer:
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random.shuffle(self.shuffle_buffer)
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for sample in self.shuffle_buffer:
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yield sample
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self.shuffle_buffer = []
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def __len__(self):
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"""
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@ -545,7 +532,7 @@ def worker_init_fn(worker_id):
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torch.manual_seed(seed % (2**32))
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def custom_collate(batch):
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def custom_collate_with_txt(batch):
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"""自定义批处理函数"""
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if not batch:
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return {}
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@ -565,15 +552,26 @@ def custom_collate(batch):
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"py": [item["py"] for item in batch],
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}
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# 如果存在token_type_ids则添加
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if "token_type_ids" in hints[0]:
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result["hint"]["token_type_ids"] = torch.cat(
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[h["token_type_ids"] for h in hints]
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)
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return result
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# 如果存在freq则添加
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if "freq" in batch[0]:
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result["freq"] = torch.tensor([item["freq"] for item in batch])
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def custom_collate(batch):
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"""自定义批处理函数"""
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if not batch:
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return {}
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# 处理hint字段
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hints = [item["hint"] for item in batch]
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# 合并所有张量字段
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result = {
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"hint": {
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"input_ids": torch.cat([h["input_ids"] for h in hints]),
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"attention_mask": torch.cat([h["attention_mask"] for h in hints]),
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},
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"char_id": torch.cat([item["char_id"] for item in batch]),
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"py": [item["py"] for item in batch],
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}
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return result
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@ -593,31 +591,41 @@ if __name__ == "__main__":
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query_engine=query_engine,
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tokenizer_name="iic/nlp_structbert_backbone_tiny_std",
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max_len=88,
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batch_query_size=500,
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batch_query_size=300,
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shuffle=True,
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shuffle_buffer_size=1000,
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shuffle_buffer_size=4000,
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)
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logger.info("数据集初始化")
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dataloader = DataLoader(
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dataset,
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batch_size=256,
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batch_size=1024,
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num_workers=15,
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worker_init_fn=worker_init_fn,
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# pin_memory=True,
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collate_fn=custom_collate,
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prefetch_factor=32,
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collate_fn=custom_collate_with_txt,
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prefetch_factor=8,
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persistent_workers=True,
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shuffle=False, # 数据集内部已实现打乱
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timeout=60,
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)
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"""import cProfile
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def profile_func(dataloader):
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for i, sample in tqdm(enumerate(dataloader), total=3000):
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if i >= 3000:
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break
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return
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cProfile.run('profile_func(dataloader)')
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"""
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# 测试数据集
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try:
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iterator = iter(dataset)
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logger.info("测试数据集")
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for i, _ in tqdm(enumerate(dataloader), total=200):
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if i >= 200:
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for i, sample in tqdm(enumerate(dataloader), total=3000):
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if i >= 3000:
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break
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"""
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print(f"Sample {i+1}:")
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@ -629,3 +637,4 @@ if __name__ == "__main__":
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"""
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except StopIteration:
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print("数据集为空")
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@ -400,6 +400,12 @@ class QueryEngine:
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return matches[:limit] if limit > 0 else matches
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def is_chinese_char(self, char: str) -> bool:
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"""
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判断是否是汉字
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"""
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return char in self._char_to_ids
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def get_statistics(self) -> Dict[str, Any]:
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"""
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获取系统统计信息
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