1. Intro to Langchain

LangChain is a framework designed to build applications powered by language models. It provides tools and abstractions to interact with LLMs (Large Language Models) and external APIs, enabling the creation of dynamic and context-aware applications (took this from internet)

Key Concepts I Learnt:

• Tools: Functions or APIs that the LLM can use to perform specific tasks (e.g., searching the web, retrieving data).
• Prompt Engineering: Crafting system and user prompts to guide the LLM’s behavior and output.
• Chains: Sequences of actions or tools that the LLM can execute to achieve a goal.

2. Custom Tools for Travel Planning

To build the travel planner, I created several custom tools using LangChain’s Tool class. These tools are designed to handle specific aspects of travel planning, such as cost breakdowns, timing, and travel conditions.

Tools Created:

1. Search Tool for General Information

search_serp = Tool(
    name="search",
    func=search.run,
    description="useful for when you need to answer questions about current events. Use searching when Cost breakdown is required. Use this when time of travel is required. Ask targeted and specific questions!",
)

• Purpose: Handles general queries about current events, travel costs, and timing.
• Use Case: When the user asks for a broad travel plan, this tool fetches relevant information.

2. Search Tool for Cost Breakdown

search_serp_costing = Tool(
    name="search_serp_costing",
    func=search.run,
    description="Use this when you are asked to calculate travel costs. Make sure to get the accurate costs by doing precise searches. You have to calculate the cost per person as there can be many people in the group. These components contribute to cost: 1. Transportation 2. Visiting ticket fee 3. Fooding 4. Recreational/Luxury costs etc. Be accurate and precise in your web searching questions!",
)

• Purpose: Focuses on calculating travel costs, including transportation, tickets, food, and luxury expenses.
• Use Case: When the user requests a detailed cost breakdown, this tool performs precise searches to provide accurate estimates.

3. Search Tool for Travel Timing

search_serp_timing = Tool(
    name="search_serp_timing",
    func=search.run,
    description="Use this when you are asked to calculate travel timing. Make sure to get the accurate times for each possible location-to-location travel and then return the total of all times. Be accurate and precise in your web searching questions!",
)