langchain使用手册
时间: 2023-11-16 22:07:49 浏览: 154
lingo用户手册
Langchain是一个基于Python的自然语言处理工具,可以用于文本切分和问答系统。以下是使用手册:
1. 安装Langchain
```python
pip install langchain
```
2. 创建向量存储
```python
from langchain.vectorizer import Vectorizer
# 创建一个向量化器
vectorizer = Vectorizer()
# 向向量化器中添加文本
vectorizer.add_text("This is a sample text.")
vectorizer.add_text("Another text for testing.")
# 获取向量化后的结果
vectors = vectorizer.get_vectors()
# 打印结果
print(vectors)
```
3. 不同类型的chain链
```python
from langchain.chain import Chain
# 创建一个Chain对象
chain = Chain()
# 添加文本
chain.add_text("This is a sample text.")
chain.add_text("Another text for testing.")
# 获取chain链
chain_list = chain.get_chain()
# 打印结果
print(chain_list)
```
4. 整体框架
```python
from langchain.qa_system import QASystem
# 创建一个QASystem对象
qa_system = QASystem()
# 添加问题和答案
qa_system.add_qa("What is Langchain?", "Langchain is a natural language processing tool.")
qa_system.add_qa("How to use Langchain?", "You can use Langchain for text splitting and QA system.")
# 回答问题
answer = qa_system.answer("What is Langchain?")
# 打印答案
print(answer)
```
5. 文本切分
```python
from langchain.text_splitter import TextSplitter
# 创建一个TextSplitter对象
splitter = TextSplitter()
# 添加文本
splitter.add_text("This is a sample text. Another text for testing.")
# 获取切分结果
sentences = splitter.get_sentences()
# 打印结果
print(sentences)
```
6. 图解流程
![Langchain流程图](https://github.com/hwchase17/langchain/blob/master/images/langchain.png)
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