LLM Apps in Production (RAG + Vector DB + Caching) · レッスン

シンプルなRAGパイプラインの構築

データの取り込みから、選択したLLMを使った応答の生成まで、基本的なRAGワークフローを実装します。

「シンプルなRAGパイプラインの構築」はCoddyKit上の無料LLM Apps in Production (RAG + Vector DB + Caching)レッスンです。これはレッスン3/4です。下記で完全なレッスンを無料で読むことができます。その後、ブラウザ内の組み込みコードエディタと24時間対応のAIチューターでハンズオン演習できます。これはLLM Apps in Production (RAG + Vector DB + Caching)学習パスの一部であり、ウェブとCoddyKitアプリ全体で進捗が同期されます。 LLM Apps in Production (RAG + Vector DB + Caching)コースには全4レッスンが含まれています。

このレッスンの一部はまだ翻訳されておらず、英語で表示されています。

Intro to RAG Pipelines

You've learned what RAG is and why it's powerful. Now, let's build one! A Retrieval Augmented Generation (RAG) pipeline is a sequence of steps that combine an LLM with external data.

Its main goal is to give LLMs up-to-date, factual information, reducing "hallucinations" and improving response quality.

Understanding the RAG Flow

Think of a RAG pipeline as having two main phases: preparation and querying. First, you get your data ready. Then, when a user asks a question, your system finds relevant info and uses it to help the LLM answer.

Preparation: Ingest & Index Data
Querying: Retrieve & Generate Response

Step 1: Prepare Your Knowledge Base

Before an LLM can use your data, it needs to be processed. This involves:

Loading: Getting data from various sources (PDFs, websites, databases).
Chunking: Breaking large documents into smaller, manageable pieces (chunks). A chunk might be a few sentences or a paragraph.

Smaller chunks are easier to search and fit into an LLM's context window.

Step 2: Turn Chunks into Embeddings

How do we "search" text semantically? We turn it into numbers! An embedding model converts each text chunk into a list of numbers called a vector embedding.

These vectors capture the meaning of the text. Chunks with similar meanings will have vectors that are "close" to each other in a mathematical sense.

Step 3: Store for Fast Retrieval

Once you have vector embeddings for all your chunks, you need to store them efficiently. A vector store (or vector database) is specialized for this.

It allows for very fast "similarity search" – finding vectors that are closest to a given query vector. This is key for quickly retrieving relevant information.

Processing a User Query

When a user types a question, your RAG pipeline springs into action. The first thing that happens is that the user's query itself is converted into a vector embedding.

This query embedding will then be used to search your stored data for relevant information.

Step 4: Find the Best Matches

With the user query's embedding, the RAG system performs a similarity search in your vector store. It looks for data chunks whose embeddings are most similar to the query's embedding.

The most similar chunks are considered the most relevant "context" for answering the user's question.

Step 5: Enhance the LLM's Prompt

Now, we combine the user's original question with the retrieved context. This creates an augmented prompt.

Instead of just asking, "What is X?", the prompt becomes something like: "Given this information: [retrieved chunks], what is X?"

This guides the LLM to use the provided facts.

Step 6: LLM Generates the Answer

Finally, the augmented prompt is sent to the Large Language Model. The LLM processes both the user's question and the retrieved context.

It then generates a response that is grounded in the factual information provided by your data, rather than relying solely on its pre-trained knowledge.

Visualize the RAG Steps

Here's a conceptual Python example showing the flow. Imagine load_data, chunk_text, create_embeddings, index_embeddings, search_vector_store, and generate_llm_response are functions you'd implement.

Try running this example to see the sequence!

public class Main {
  public static void main(String[] args) {
    System.out.println("1. User query received: What is RAG?");

    // Simulate embedding the query
    String queryEmbedding = "Embedding for 'What is RAG?'";
    System.out.println("2. Query embedded: " + queryEmbedding);

    // Simulate retrieving relevant chunks from a vector store
    String[] retrievedChunks = {
      "Chunk 1: RAG helps LLMs use external facts.",
      "Chunk 2: Vector databases store embeddings."
    };
    System.out.println("3. Retrieved relevant chunks: " + String.join(", ", retrievedChunks));

    // Simulate augmenting the LLM prompt
    String augmentedPrompt = (
      "Based on the following context:\n"
      + String.join(" ", retrievedChunks) + "\n\n"
      + "Answer the question: What is RAG?"
    );
    System.out.println("4. Augmented LLM prompt created.");

    // Simulate LLM response generation
    String llmResponse = (
      "RAG pipelines enhance LLMs by providing external, "
      + "factual context from stored documents, which helps "
      + "reduce hallucinations and improve accuracy."
    );
    System.out.println("5. LLM generated response.");

    System.out.println("\nFinal Answer: " + llmResponse);
  }
}

RAG Pipeline Quiz

Which of the following accurately describes the correct order of steps when a user submits a query in a RAG pipeline?

Recap: Building RAG

Great job! You've now grasped the full flow of a basic RAG pipeline. We covered:

The preparation steps: ingesting, chunking, embedding, and indexing your data.
The querying steps: embedding the user query, retrieving context, augmenting the prompt, and generating a response with the LLM.

This foundational understanding will help you build more robust LLM applications!

よくある質問

「シンプルなRAGパイプラインの構築」レッスンは無料ですか？

はい。「シンプルなRAGパイプラインの構築」の完全なテキストはこのウェブで無料で読めます。インタラクティブに演習し（組み込みコードエディタと24時間対応のAIチューター）、LLM Apps in Production (RAG + Vector DB + Caching)コースの残りをアンロックするには、CoddyKit PROにアップグレードしてください。 LLM Apps in Production (RAG + Vector DB + Caching)コースには全4レッスンが含まれています。

「シンプルなRAGパイプラインの構築」で何を学びますか？

データの取り込みから、選択したLLMを使った応答の生成まで、基本的なRAGワークフローを実装します。ブラウザで直接実行するハンズオンコードでLLM Apps in Production (RAG + Vector DB + Caching)を演習し、24時間対応のAIチューターがレッスンを進める中での質問に答えます。

LLM Apps in Production (RAG + Vector DB + Caching)を始めるのに経験は必要ですか？

事前経験は必要ありません。CoddyKitのLLM Apps in Production (RAG + Vector DB + Caching)は初級者から上級者向けに構成されているため、ここから始めるか最初から始めて、自分のペースで進むことができます。これはレッスン3/4です。

「シンプルなRAGパイプラインの構築」レッスンにはどのくらい時間がかかりますか？

ほとんどのCoddyKitレッスンは約5～10分かかります。各レッスンはコンパクトでインタラクティブなので、着実に進歩し、ウェブとアプリ全体で正確に前回の場所から再開できます。

このLLM Apps in Production (RAG + Vector DB + Caching)レッスンでコードを書いて実行できますか？

はい。すべてのLLM Apps in Production (RAG + Vector DB + Caching)レッスンに組み込みコードエディタが含まれているため、ブラウザでリアルコードを書いて実行し、即座のAIフィードバックを取得できます。ローカル設定は不要です。

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