September 2025
Intermediate to advanced
296 pages
4h 30m
Japanese
Content preview from 初めてのLangChain ―LangChainとLangGraphによるAI/LLMアプリケーションの構築
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はじめに
2022年11月30日、サンフランシスコを拠点とする企業OpenAIは、人間のようにコンテンツを生成し、質問に答え、問題を解決できる話題のAIチャットボットChatGPT（https://openai.com/blog/chatgpt）を公開した。ChatGPTは公開からわずか2か月で、コンシューマ向けアプリケーションとして史上最速で1億人以上の月間アクティブユーザー（https://oreil.ly/ATsLe）を集めた。ChatGPTは、OpenAIの大規模言語モデル（LLM）を命令、対話形式にチューニングしたバージョンを基盤とするチャットボットである。これらの概念の定義については後ほど説明する。
その3か月後、OpenAIはChatGPT API（https://oreil.ly/DwU7R）を公開し、開発者がチャットおよび音声をテキストに変換する機能にアクセスできるようになった。これにより、「生成AI」を活用した無数の新しいアプリケーションや技術開発が生まれ始めた。
![[注記]](/api/v2/epubs/urn:orm:book:9784814401307/files/images/note.png) |
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LangChainの有無にかかわらず、LLMアプリケーションを構築するにはLLMが不可欠である。本書のコード例ではLLMプロバイダーとしてOpenAI APIを使用する（<span>使用料金は「API料金」のページ（https://openai.com/api/pricing/）に掲載されている）。LangChainを利用する利点の1つは、OpenAIはもちろん、他の商用あるいはオープンソースのLLMプロバイダーでも、本書のコード例をすべて実行できる点である。 ... |
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.