实验中代码仅提供一种简单的 Bi-LSTM+CRF PyTorch 实现方案。
更优实现可参见:https://github.com/bamtercelboo/pytorch_NER_BiLSTM_CNN_CRF/
## 环境搭建
1. 安装 Anaconda
<a href="https://zhuanlan.zhihu.com/p/75717350">windows 下安装教程</a>
官方文档:<a href="https://docs.continuum.io/anaconda/install/">anaconda install</a>
2. 搭建虚拟环境并安装 PyTorch
```shell
# 创建虚拟环境
conda create -n nlplab python=3.7 # 创建名为 nlplab 的虚拟环境
# 虚拟环境相关命令
conda activate nlplab # 激活虚拟环境nlplab,成功执行后应看到命令行首部由 (base) 变为 (nlplab)
conda deactivate # 退出当前虚拟环境
conda info -e # 查看所有虚拟环境,*指示当前所处环境
# 安装 Pytorch 1.6.0 CPU 版本
# 注意:先激活 nlplab 虚拟环境,再进行安装
conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/pytorch/
conda install pytorch==1.6.0 cpuonly
```
## 运行方式
1. 配置 PyCharm
安装 PyCharm,并在 PyCharm 中使用 Anaconda 虚拟环境 (<a href="https://jingyan.baidu.com/article/f3e34a12e7b015f5eb653523.html">参考</a>)
2. 安装其他依赖
```sh
# 在 nlplab 虚拟环境中安装
pip install -r requirements.txt
```
3. 训练
```shell
# save 目录下存放了一个粗略训练过的模型,可先跳过训练过程直接进行推断
# 数据准备,data 目录下运行
python data_u.py
# 模型训练,项目根目录下运行
# 若安装并配置了 GPU 相关运行环境可添加命令行参数 --cuda 来使用 GPU 训练
python run.py
```
4. 推断
```shell
python infer.py
```
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基于Bi-LSTM的中文分词模型.zip
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NLP入门,基于Bi-LSTM的中文分词模型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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