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

ベクトル埋め込みと類似度検索

ベクトル埋め込みの概念と生成方法、類似度検索によって関連性の高いドキュメントを取得できる仕組みを理解します。

「ベクトル埋め込みと類似度検索」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2/4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。

Vectors for Meaning

Welcome! In the world of Large Language Models (LLMs), understanding text isn't just about words. It's about meaning.

Computers naturally work with numbers, not human language. How do we bridge this gap to help LLMs understand the meaning of text?

What are Vector Embeddings?

Vector embeddings are numerical representations of text (or images, audio, etc.). Think of them as a list of numbers that capture the 'essence' or 'meaning' of a piece of information.

Each piece of text (a word, sentence, or document) gets its own unique vector.
These vectors are usually long lists of floating-point numbers (e.g., [0.123, -0.456, 0.789, ...]).

The Magic Behind Embeddings

How are these magical numbers created? Special machine learning models, often called embedding models, are trained to convert text into these vectors.

These models learn to map similar meanings to vectors that are numerically 'close' to each other in a high-dimensional space.

Semantic Similarity Explained

The core idea is that if two pieces of text have similar meanings, their vector embeddings will be close together.

For example, the embedding for "cat" would be closer to "kitten" than to "car". This 'closeness' is what allows computers to understand semantic similarity.

Generating Embeddings (Concept)

In a real RAG system, you'd use an API from a provider like OpenAI, Cohere, or an open-source model to generate embeddings for your text data.

You feed the text, and the API returns the vector. It's that simple from a usage perspective!

Code: Mock Embedding Generation

Here's a Python example showing how you might conceptually interact with an embedding function. In reality, get_embedding would make an API call.

def get_embedding(text):
    """
    Simulates an embedding model. Returns a dummy vector.
    """
    if "hello" in text.lower():
        return [0.1, 0.2, 0.3]
    elif "goodbye" in text.lower():
        return [0.8, 0.7, 0.6]
    else:
        return [0.0, 0.0, 0.0]

if __name__ == "__main__":
    text1 = "Hello, CoddyKit!"
    text2 = "Time to say goodbye."
    text3 = "Another sentence."

    print(f"Vector for '{text1}': {get_embedding(text1)}")
    print(f"Vector for '{text2}': {get_embedding(text2)}")
    print(f"Vector for '{text3}': {get_embedding(text3)}")

Why Similarity Search?

Once you have all your documents (or chunks of documents) converted into embeddings, how do you find the most relevant ones when a user asks a question?

This is where similarity search comes in. It's the process of finding embeddings that are 'closest' to a given query embedding.

How Similarity Search Works

Similarity search mathematically measures the 'distance' or 'angle' between vectors. Common methods include:

Cosine Similarity: Measures the angle between two vectors. A smaller angle (closer to 1) means higher similarity.
Euclidean Distance: Measures the straight-line distance between two points (vectors). A smaller distance means higher similarity.

These calculations quickly identify the most semantically similar documents.

Embeddings + Search = RAG Power

In RAG, when a user asks a question:

The question is converted into an embedding.
Similarity search is performed against a database of document embeddings.
The top N most similar document chunks are retrieved.

These retrieved chunks then provide context to the LLM, making its answers more accurate and grounded.

Quick Check on Embeddings

Vector embeddings are crucial for RAG. Let's test your understanding.

Recap: Embeddings & Search

Great job! You've learned about the foundational concepts of vector embeddings and similarity search.

Vector embeddings turn text into numbers, capturing meaning.
Embedding models create these vectors.
Similarity search uses mathematical distance to find the most relevant vectors (and thus documents) to a query.

These techniques are at the heart of how RAG systems find and provide relevant context to LLMs.

よくある質問

「ベクトル埋め込みと類似度検索」レッスンは無料ですか？

はい。「ベクトル埋め込みと類似度検索」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。

「ベクトル埋め込みと類似度検索」で何を学びますか？

ベクトル埋め込みの概念と生成方法、類似度検索によって関連性の高いドキュメントを取得できる仕組みを理解します。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2/4です。

「ベクトル埋め込みと類似度検索」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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