AI/ML, Cloud Computing, Data Analytics

3 Mins Read

Building LLM applications with LangChain

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The capabilities of advanced language models like OpenAI’s GPT-3, Google’s BERT, and Meta’s LLaMA have been revolutionizing various industries by empowering the generation of diverse text types. These applications span crafting marketing content, writing data science code, and creating poetry. While ChatGPT has garnered substantial attention for its user-friendly chat interface, numerous unexplored opportunities exist for harnessing the potential of large language models by seamlessly integrating them into diverse software applications.

If you’re fascinated by the transformative potential of Generative AI and large language models, you’re in for a treat with this tutorial. Here, we delve into LangChain, an open-source Python framework designed for constructing applications centered around these formidable language models, including GPT.


LangChain represents an open-source framework meticulously crafted to streamline the creation of applications driven by the prowess of large language models (LLMs). It furnishes a comprehensive suite of tools, components, and interfaces that serve as invaluable aids in the development of LLM-centric applications. Using LangChain, managing interactions with language models, establishing seamless connections between diverse components, and seamlessly integrating external resources like APIs and databases becomes remarkably straightforward.

The LangChain platform boasts a rich repository of APIs that developers can effortlessly integrate into their applications, allowing them to infuse sophisticated language processing functionalities without needing to construct everything from scratch painstakingly. As a result, LangChain effectively streamlines the entire process of crafting LLM-powered applications, rendering it accessible and beneficial to developers spanning a wide range of expertise levels.

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Large Language Models (LLMs)

Large Language Models (LLMs) are sophisticated artificial intelligence systems developed to comprehend and produce human-like text. These models undergo extensive training with massive datasets, which equips them with the ability to understand intricate language patterns, grasp subtle linguistic nuances, and generate coherent written content. LLMs possess a wide range of language-related capabilities, encompassing tasks such as language translation, text completion, summarization, and even participating in natural conversational interactions. An illustration of an LLM is the Generative Pre-trained Transformer (GPT).

Components of LangChain

  • Components and chains – In LangChain, components are modules performing specific functions in the language processing pipeline. These components can be linked into “chains” for tailored workflows, such as a customer service chatbot chain with sentiment analysis, intent recognition, and response generation modules.
  • Prompt templates – Prompt templates are reusable predefined prompts across chains. These templates can become dynamic and adaptable by inserting specific “values.” For example, a prompt asking for a user’s name could be personalized by inserting a specific value. This feature is beneficial for generating prompts based on dynamic resources.
  • Vector stores – These are used to store and search information via embeddings, essentially analyzing numerical representations of document meanings. VectorStore serves as a storage facility for these embeddings, allowing efficient search based on semantic similarity.
  • Indexes and retrievers – Indexes act as databases storing details and metadata about the model’s training data, while retrievers swiftly search this index for specific information. This improves the model’s responses by providing context and related information.
  • Output parsers – Output parsers come into play to manage and refine the responses generated by the model. They can eliminate undesired content, tailor the output format, or supplement extra data to the response. Thus, output parsers help extract structured results, like JSON objects, from the language model’s responses.
  • Example selectors – Example selectors in LangChain serve to identify appropriate instances from the model’s training data, thus improving the precision and pertinence of the generated responses. These selectors can be adjusted to favor certain examples or filter out unrelated ones, providing a tailored AI response based on user input.
  • Agents – Agents are unique LangChain instances, each with specific prompts, memory, and chain for a particular use case. They can be deployed on various platforms, including web, mobile, and chatbots, catering to a wide audience.

A Guide to Set up LangChain in Python

  • Install using pip
  • Environment setup
  • Language Model Application in LangChain


Not long ago, we were genuinely amazed by the impressive capabilities showcased by ChatGPT. However, the landscape of AI development has rapidly evolved, and now we have access to new developer tools, such as LangChain, that empower us to craft similarly extraordinary prototypes right on our personal laptops within a matter of hours.

LangChain, an open-source Python framework, provides individuals with the means to create applications that harness the power of LLMs (Large Language Models). This framework boasts a versatile interface that connects seamlessly with a multitude of foundational models, making it exceptionally efficient for swift management.

Drop a query if you have any questions regarding LangChain and we will get back to you quickly.

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1. Who can benefit from using LangChain?

ANS: – LangChain is beneficial to developers with varying levels of expertise. It simplifies the process of building LLM-powered applications, making it accessible to a wide range of developers.

2. What are some typical use cases for LLMs like GPT?

ANS: – LLMs like GPT can be used for tasks such as natural language understanding, text generation, language translation, summarization, and even engaging in conversation through chatbots.

WRITTEN BY Arslan Eqbal



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