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

多様なドキュメント形式の読み込み

PDF、Webページ、データベース、独自のファイル形式など、さまざまなソースからデータを取り込む方法を学びます。

「多様なドキュメント形式の読み込み」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1/4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。

Ingesting Diverse Document Types

Welcome! In RAG, your LLM needs information from various sources. This lesson explores how to load data from different document formats into your application.

The goal is to get raw text from places like web pages, PDFs, and databases, preparing it for the next steps in your RAG pipeline.

Loading Web Pages (HTML)

Web pages are a common source of information. To ingest them, you typically:

Fetch the HTML: Use an HTTP client to download the page content from a URL.
Parse the HTML: Extract the main text and discard navigation, ads, and other irrelevant elements.

Libraries like requests for fetching and BeautifulSoup for parsing are very popular in Python.

Web Page Loading Example

This Python snippet demonstrates fetching a simple web page and extracting its title. Imagine doing this for many pages to build your knowledge base!

import requests
from bs4 import BeautifulSoup

def main():
    url = "http://quotes.toscrape.com/"
    try:
        response = requests.get(url)
        response.raise_for_status() # Raise HTTPError for bad responses
        soup = BeautifulSoup(response.text, 'html.parser')
        title = soup.find('title').get_text()
        print(f"Page Title: {title}")
    except requests.exceptions.RequestException as e:
        print(f"Error fetching URL: {e}")

if __name__ == "__main__":
    main()

Extracting Text from PDFs

PDFs (Portable Document Format) are widely used for reports and documents. Extracting text from PDFs can be tricky due to their complex structure, which combines text, images, and formatting.

Fortunately, programming libraries exist to help. They can read the PDF structure and pull out the textual content, often page by page.

PDF Text Extraction Example

This conceptual Python code shows how you might extract text from the first page of a PDF using a library like pypdf. For a real run, you'd need a sample.pdf file.

from pypdf import PdfReader

def main():
    # In a real scenario, 'sample.pdf' would exist
    # For this example, we'll simulate the output
    pdf_file_path = "sample.pdf"
    print(f"Attempting to read from: {pdf_file_path}")
    print("\n--- Simulated PDF Content ---")
    print("This is some text from the first page of a sample PDF document.")
    print("It contains important information for our RAG system.")
    print("-----------------------------")
    # Actual code might look like this:
    # reader = PdfReader(pdf_file_path)
    # page = reader.pages[0]
    # text = page.extract_text()
    # print(text)

if __name__ == "__main__":
    main()

Loading Data from Databases

Databases, both SQL (like PostgreSQL, MySQL) and NoSQL (like MongoDB, Cassandra), store structured data that can be valuable for RAG.

To ingest from databases:

Connect: Establish a connection using database drivers.
Query: Write queries (e.g., SQL statements) to retrieve relevant data.
Process: Extract text fields from the query results.

Database Loading Example

Here's a Python example using SQLite, an embedded SQL database. It creates a simple table, inserts data, and then retrieves it. This is a common pattern for database ingestion.

import sqlite3

def main():
    # Connect to an in-memory SQLite database
    conn = sqlite3.connect(':memory:')
    cursor = conn.cursor()

    # Create a simple table
    cursor.execute('''
        CREATE TABLE IF NOT EXISTS documents (
            id INTEGER PRIMARY KEY,
            title TEXT,
            content TEXT
        )
    ''')

    # Insert some data
    cursor.execute("INSERT INTO documents (title, content) VALUES (?, ?)", 
                   ("RAG Overview", "RAG enhances LLMs by retrieving relevant docs."))
    cursor.execute("INSERT INTO documents (title, content) VALUES (?, ?)", 
                   ("Vector DBs", "Store embeddings for fast similarity search."))
    conn.commit()

    # Retrieve data
    cursor.execute("SELECT title, content FROM documents")
    rows = cursor.fetchall()

    print("--- Retrieved Documents ---")
    for row in rows:
        print(f"Title: {row[0]}, Content: {row[1]}")
    print("---------------------------")

    conn.close()

if __name__ == "__main__":
    main()

Handling Plain Text & Custom Files

Beyond specific formats, you'll often deal with plain text files (.txt, .md) or custom formats (e.g., CSV, JSON). For these:

Plain Text: Read directly, paying attention to encoding (UTF-8 is common).
Custom Formats: Use libraries specific to the format (e.g., csv, json modules in Python) to parse and extract text fields.

The key is transforming the data into a usable text string.

Unified Data Loading with Libraries

For complex RAG systems, you don't always need to write custom loaders for every format. Libraries like LlamaIndex and LangChain offer 'Document Loaders' that abstract away much of this complexity.

They provide connectors for many data sources (web, PDF, databases, cloud storage).
They often handle basic parsing and text extraction automatically.

These tools simplify the initial ingestion step, letting you focus on retrieval and generation.

Check Your Knowledge

Which of the following is typically a primary challenge when extracting text content from PDF documents for a RAG system?

Recap: Loading Diverse Data

Great job! You've learned the fundamentals of loading diverse document formats for your RAG system.

We covered fetching and parsing web pages.
Discussed extracting text from complex PDFs.
Explored querying databases for structured content.
Touched upon handling plain text and other custom files.
Recognized the value of unified data loading libraries.

The next step is to prepare this raw text for effective retrieval!

よくある質問

「多様なドキュメント形式の読み込み」レッスンは無料ですか？

はい。「多様なドキュメント形式の読み込み」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。

「多様なドキュメント形式の読み込み」で何を学びますか？

PDF、Webページ、データベース、独自のファイル形式など、さまざまなソースからデータを取り込む方法を学びます。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1/4です。

「多様なドキュメント形式の読み込み」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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