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コンピュータが自然言語を構成することを想定すると、コンピュータが目的とか意欲とか意図を持たなければならないとつくづく思う。単純に、意欲という言葉で表そう。いろいろなレベルの意欲というのがある。何かを話そうというか、話し言葉を構成しようとするときには、これを相手に伝えたいという意欲が大事な働きをするはずだ。それは、どのように表現するのかを少し考えてみる。
何を隠そう、私が生業としているのは、経済学である。博士号も、経済学でとっている。大学は工学部で、情報を専門としていた。共通しているのは、数学をツールとするところか。まあ、いろいろあった。
経済学は理論的には、人間を一個の経済評価をする機械のように考えている。多次元の効用関数を持っているのだ。その効用関数で見て、より評価値の高いものを求めて「選択」をする機械が経済学が見る人間なのだ。
が評価関数としての効用関数である。
という変数の値によって評価値が変わる。
これが経済学の想定する人間の「意欲」の源泉なのである。ロボットの場合、
は、外界からの反応（たとえば、センサー値だったり）、何らかの内部状態の値だったりするのだろう。
言葉を構成するときにも、このような評価関数を持っていなければならないのではないかと思ったのだ。