LangChain-Teacher's goal is to facilitate interactive learning of LangChain, enabling users to begin with the Python-based LangChain through a chat-based learning interface. The app offers two teaching styles: Instructional, which provides step-by-step instructions, and Interactive lessons with questions, which prompts users with questions to assess their understanding.

The hosted version of the app is on Streamlit Cloud at lang-teacher.streamlit.app

The core of the teaching process is driven by the prompts defined in get_prompt.py. This module creates lessons based on the content available in the lc_guides folder, where lessons are stored as .txt files.

To give a bit more context:

• The prompt, combined with the lesson content from the .txt file, is sent to a Language Learning Model (LLM) to assist in generating bite-sized lessons.

• The chat memory helps LLM retain information about previous instructions and add new ones to the conversation.

• This showcases the power of prompt templates and how prompt engineering could be used in the development of LLM applications.

This Streamlit app guides users through lessons using a chat-based interface. To get started, follow these steps:

• Python 3.10 or higher

1. Clone the repository from GitHub or create a GitHub Codespace:

   git clone https://github.com/hwchase17/langchain-teacher.git
   

   Change directory to the langchain-teacher directory

   cd langchain-teacher
   

2. Install the required dependencies listed in requirements.txt:

   pip install -r requirements.txt
   

3. Create a .env file in the root directory and add the following environment variables:

   OPENAI_API_KEY=
   LANGCHAIN_ENDPOINT=
   LANGCHAIN_API_KEY=
   LANGCHAIN_TRACING_V2=
   LANGCHAIN_PROJECT=
   

   An example .env file is provided as .env-example. If you're not using LangSmith, you only need to set the OPENAI_API_KEY variable.

4. Run the Streamlit app using the command:

   streamlit run lc_main.py
   

   If using dotenv to manage environment variables, use the following command:

   dotenv streamlit run lc_main.py
   

• The initial version of the app used a getting started guide at guide.txt together with the main.py file to run the streamlit app. You can also run the initial version of the app using the command:

   streamlit run main.py
  

• There is also a tutor for LangChain expression language with lesson files in the lcel folder and the lcel.py file to run the streamlit app.

• The supervisor-model branch in this repository implements a SequentialChain to supervise responses from students and teachers. This approach aims to ensure that questions are on-topic by the students and that the responses are accordingly as well by the teacher model.

• Integration with LangSmith Hub: Integrate prompts directly into the LangSmith Hub.

• Expanding Lesson Library: Continuously add new lessons to create a comprehensive learning resource.

• Token Usage Improvement: Currently the prompt sent to the LLM is quite large as it takes the prompt and the lesson. Could be improved further.

Please feel free to add more lessons/examples/use cases. We would love for langchain-teacher to be the first stop for any new learner. You can contribute by creating pull requests or raising issues.

This project is licensed under the MIT License.