Mistral AI

MistralAI Documentation

Project setup

To install langchain4j to your project, add the following dependency:

For Maven project pom.xml

<dependency>
    <groupId>dev.langchain4j</groupId>
    <artifactId>langchain4j</artifactId>
    <version>{your-version}</version> <!-- Specify your version here -->
</dependency>

<dependency>
    <groupId>dev.langchain4j</groupId>
    <artifactId>langchain4j-mistral-ai</artifactId>
    <version>{your-version}</version>
</dependency>

For Gradle project build.gradle

implementation 'dev.langchain4j:langchain4j:{your-version}'
implementation 'dev.langchain4j:langchain4j-mistral-ai:{your-version}'

API Key setup

Add your MistralAI API key to your project, you can create a class ApiKeys.java with the following code

public class ApiKeys {
    public static final String MISTRALAI_API_KEY = System.getenv("MISTRAL_AI_API_KEY");
}

Don't forget set your API key as an environment variable.

export MISTRAL_AI_API_KEY=your-api-key #For Unix OS based
SET MISTRAL_AI_API_KEY=your-api-key #For Windows OS

More details on how to get your MistralAI API key can be found here

Embedding

The MistralAI Embeddings model allows you to embed sentences, and using it in your application is simple. We provide a simple example to get you started with MistralAI Embeddings model integration.

Create a class and add the following code.

import dev.langchain4j.data.embedding.Embedding;
import dev.langchain4j.data.segment.TextSegment;
import dev.langchain4j.model.mistralai.MistralAiEmbeddingModel;
import dev.langchain4j.model.embedding.EmbeddingModel;
import dev.langchain4j.store.embedding.EmbeddingMatch;
import dev.langchain4j.store.embedding.EmbeddingStore;
import dev.langchain4j.store.embedding.inmemory.InMemoryEmbeddingStore;

import java.util.List;

public class HelloWorld {
    public static void main(String[] args) {
        EmbeddingModel embeddingModel = MistralAiEmbeddingModel
                .withApiKey(System.getenv("MISTRAL_AI_API_KEY"));

        // For simplicity, this example uses an in-memory store, but you can choose any external compatible store for production environments.
        EmbeddingStore<TextSegment> embeddingStore = new InMemoryEmbeddingStore<>();

        TextSegment segment1 = TextSegment.from("I like football.");
        Embedding embedding1 = embeddingModel.embed(segment1).content();
        embeddingStore.add(embedding1, segment1);
        
        TextSegment segment2 = TextSegment.from("The weather is good today.");
        Embedding embedding2 = embeddingModel.embed(segment2).content();
        embeddingStore.add(embedding2, segment2);
        
        String userQuery = "What is your favourite sport?";
        Embedding queryEmbedding = embeddingModel.embed(userQuery).content();
        int maxResults = 1;
        List<EmbeddingMatch<TextSegment>> relevant = embeddingStore.findRelevant(queryEmbedding, maxResults);
        EmbeddingMatch<TextSegment> embeddingMatch = relevant.get(0);

        System.out.println("Question: " + userQuery); // What is your favourite sport?
        System.out.println("Response: " + embeddingMatch.embedded().text()); // I like football.
    }
}

For this example, we'll add 2 text segments, but LangChain4j offers built-in support for loading documents from various sources: File System, URL, Amazon S3, Azure Blob Storage, GitHub, Tencent COS. Additionally, LangChain4j supports parsing multiple document types: text, pdf, doc, xls, ppt.

The output will be similar to this:

Question: What is your favourite sport?
Response: I like football.

Of course, you can combine MistralAI Embeddings with RAG (Retrieval-Augmented Generation) techniques.

In RAG you will learn how to use RAG techniques for ingestion, retrieval and Advanced Retrieval with LangChain4j.

A lot of parameters are set behind the scenes, such as timeout, model type and model parameters. In Set Model Parameters you will learn how to set these parameters explicitly.

More examples

If you want to check more examples, you can find them in the langchain4j-examples project.