Sep 2026· Zenodo (CERN European Organization for Nuclear Research)
Abstract
近年,AIを学習の補助に用いる学生が増えている.しかし,無料プランと有料プランでは利用できるモデルや機能に差があり,費用の負担が学習機会の格差につながる可能性がある.そこで私たちは,有料のAIサービスを継続して利用することが難しい生徒にもAIを用いた学習環境を届けるため,数学学習支援アプリを開発した.このアプリは,大規模言語モデル(large language model,LLM)を利用者の端末で実行するローカルLLMを採用している.質問ごとの外部の推論サービスへの利用料を避け,アプリを無料で提供する構成とした.本稿で紹介する「AI先生 高校数学」は,文章または写真による質問を受け付け,教材を参照しながら日本語で解き方を説明する.実装では質問の内容を整理する段階と説明を生成する段階を分け,それぞれに必要な情報をモデルに入力する.開発環境で比較したところ,質問の整理に不要な指示を除くと回答が現れるまでの待ち時間が短縮した.また,iOSへの実装ではモデルの呼び出し方と実行条件を調べ,開発環境との違いに起因する不具合を特定した.本研究では,無料で利用できる数学学習支援を実現するための設計と,開発過程で生じた問題への対処を報告する.
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