## Bert实体抽取模型
### 前言
这是一个基于**AlBert(以下Bert若不特别强调都是AlBert)** 模型实现的文本分类模型,其中把一些常用的效果提升的方法都进行了封装,可以一键关闭和打开。
python环境:
pytorch: 1.10
transformers: 4.12.5
numpy: 1.19.0
#### 参考论文
- [A Unified MRC Framework for Named Entity Recognition](https://arxiv.org/abs/1910.11476)(MRC框架,主要优势在于可解决"嵌套"实体问题)
#### 参考代码
https://github.com/ShannonAI/mrc-for-flat-nested-ner
### 正文
目前已有的方法:
1.是否使用LSTM(ps:使用LSTM时必须使用CRF)
2.是否使用CRF
3.embedding对抗训练 FGM
4.滑动平均 EMA
ps:5.还有基于**MRC**框架的特殊BERT模型,因为它在输出阶段不再是传统的BIO的一个token多分类形式,而是类似于一个QA任务的answer抽取,所以单独创建一个文件夹放这个项目。另外MRC代码对于显存占用特别高
推荐训练超参数:
learning_rate=2e-5
batch_size=16
max_length=256(不超过512)
attack_type='FGM'
use_EMA=True
CRF_lr = 6*learning_rate
lr_decay = 0.5 0.5(当前epoch上dev的loss不再下降时生效)
ps:可根据自身任务进行调整
### 训练
python train_lstm_crf.py
读取文件路径,以及模型保存路径等都写在conf/config.py中的,自己看一下就知道了。
私人数据不方便公开,只放了几个样例供参考输入格式。
### 效果对比
| model | F1 | recall | prec |
| --- | --- | --- | --- |
| Bert | 0.9383 | 0.9429 | 0.9338 |
| Bert+CRF | 0.9485 | 0.9525 | 0.9446 |
| Bert+LSTM+CRF | 0.9503 | 0.9537 | 0.9469 |
| Bert+CRF+FGM | 0.9547 | 0.9591 | 0.9504 |
|Bert+MRC | 0.9490 | 0.9547| 0.9433 |
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基于BERT的NER模型,集成了LSTM,CRF网络结构,FGM,EMA等提分trick,还有单独的MRC框架.zip
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py:38个
pyc:18个
xml:7个
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温馨提示
基于BERT的NER模型,集成了LSTM,CRF网络结构,FGM,EMA等提分trick,还有单独的MRC框架LSTM (Long Short-Term Memory) 是一种特殊的循环神经网络(RNN)架构,用于处理具有长期依赖关系的序列数据。传统的RNN在处理长序列时往往会遇到梯度消失或梯度爆炸的问题,导致无法有效地捕捉长期依赖。LSTM通过引入门控机制(Gating Mechanism)和记忆单元(Memory Cell)来克服这些问题。 以下是LSTM的基本结构和主要组件: 记忆单元(Memory Cell):记忆单元是LSTM的核心,用于存储长期信息。它像一个传送带一样,在整个链上运行,只有一些小的线性交互。信息很容易地在其上保持不变。 输入门(Input Gate):输入门决定了哪些新的信息会被加入到记忆单元中。它由当前时刻的输入和上一时刻的隐藏状态共同决定。 遗忘门(Forget Gate):遗忘门决定了哪些信息会从记忆单元中被丢弃或遗忘。它也由当前时刻的输入和上一时刻的隐藏状态共同决定。 输出门(Output Gate):输出门决定了哪些信息会从记忆单元中输出到当前时刻的隐藏状态中。同样地,它也由当前时刻的输入和上一时刻的隐藏状态共同决定。 LSTM的计算过程可以大致描述为: 通过遗忘门决定从记忆单元中丢弃哪些信息。 通过输入门决定哪些新的信息会被加入到记忆单元中。 更新记忆单元的状态。 通过输出门决定哪些信息会从记忆单元中输出到当前时刻的隐藏状态中。 由于LSTM能够有效地处理长期依赖关系,它在许多序列建模任务中都取得了很好的效果,如语音识别、文本生成、机器翻译、时序预测等。
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