Deploying a Chatbot on Streamlit

Deploying a Chatbot on Streamlit#

In this activity, you will use the knowledge gained from the LangChain Tutorial to explore a chatbot deployed on Streamlit. You will deploy this app on your computer and interact with it.

About Streamlit#

As discussed in the lectures, Streamlit is a platform that enables data scientists to deploy dynamic, data-based apps. It’s ideal for prototyping demonstration apps and sharing them with stakeholders before full-scale production deployment.

Initial Setup and Getting the Chatbot Files#

  1. Get OpenAI and Hugging Face API Credentials
    The chatbot uses OpenAI models, so you’ll need to sign up for an OpenAI developer account and obtain an API key. For a step-by-step guide on creating an OpenAI API key, search for instructions on ChatGPT. Similarly, create a Hugging Face account and obtain an API token.

  2. Try the Chatbot on Streamlit Community Cloud
    Before downloading anything, you can try the chatbot on the Streamlit Community Cloud with just the OpenAI and Hugging Face keys.

  3. Download or Clone the Project Repository
    To get the project files on your computer, either clone the GitHub repository (if familiar with Git) or download the repository as a zipped file.

Deploying the Streamlit App Locally#

  1. Unzip and Navigate to the Project Folder
    Once unzipped, open the project folder and follow the instructions on the GitHub page to deploy the chatbot.

  2. Follow steps on GitHub project repository. Streamlit app repo

  3. Install Required Packages
    The requirements.txt file contains a list of all required packages. If you encounter a missing package error, try installing the package again (ensuring your virtual environment is activated).

  4. Run the App Locally
    Run the app with the following command:

    streamlit run streamlit_app.py

  5. Test and Check. When deployed locally, you can browse the files being used in the app.

Explore Important Scripts#

The essential components for building a chatbot with LangChain are organized into distinct, modular Python scripts. Let’s explore some of these elements. You can use VS Code or your preferred text editor for this task.

Loading Files#

In real-life applications, you may need to load hundreds of documents, requiring a versatile function for file loading. This project includes two types of loaders:

  • remote_loader.py: For loading documents from websites.

  • local_loader.py: For loading documents from the local data folder.

Document Splitting#

The splitter.py module uses the RecursiveCharacterTextSplitter strategy, with a chunk size of 1000 and an overlap of 0. This method helps in breaking down large documents into manageable sections for processing.

Prompt Chains#

In the full_chain.py, base_chain.py, and rag_chain.py modules, you’ll find configurations for the specific LLM models and prompting strategies used. The project utilizes OpenAI chat models, with customized chains designed to guide interactions effectively.

Memory Management#

Memory management strategies are also implemented to optimize the chatbot’s performance, particularly for long interactions or when processing large datasets.

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