February 2025
Intermediate
376 pages
9h 25m
Japanese
Content preview from 仕組みからわかる大規模言語モデル 生成AI時代のソフトウェア開発入門
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LangGraphの基礎
6.3
LangGraphは LangChain をベースとするエージェントフレームワークです。LangGraphの
主な特徴は、複雑な制御構造を持つワークフローを柔軟に表現できることです。これは、
LangGraphがワークフローの表現にグラフを採用していることに起因します。ここでグラフ
とは、ノード（頂点）とエッジ（辺）からなる数学的構造で、要素間の関係性を表現するのに用
いられます。
LangChainが主に扱うチェーン構造は、直線的なワークフローの表現に適した特殊なグラフ
構造です。しかし、チェーンでは繰り返しや複雑な制御構造を表現するのは困難です。例え
ば、ある条件が満たされるまで処理を繰り返す場合、チェーン構造では適切に表現できませ
ん。
これに対しLangGraphでは、チェーンに限らず一般的なグラフ構造を用いることで複雑な
制御構造を表現できます。LangGraphが扱う一般的なグラフ構造には、ノードとエッジの接
続に制限がありません。このため、様々な構造を柔軟に表現することができます。例えば、次
のような制御構造を表現できるようになります。
繰り返し処理：エッジを使って前のノードに戻ることで、ループを表現
分岐処理：一つのノードから複数のエッジを出すことで、条件分岐を表現
LangGraphでは、エージェントやツールの処理をノードとして表現し、ノード間の接続を
エッジとして表現します。エッジは次に実行すべきノードを指定します。LangGraph はノー
ドとエッジを組み合わせて、 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.