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PDFファイル 3F4 「人間・行動と機械学習」

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図 3: N-gram 素性を用いた単純ベイズ法による日常行動識別 を用いる.ただし, occ(w, C) は,ラベル C が付与されたフ レームにおける w の出現頻度を表し, Θ は素性の集合を表す. 図 3 は,予備実験の結果である.この図から, uni-gram 素 性よりも bi-gram 素性の方が有効である一方, tri-gram にな ると 11 行動の識別性能が劣化することが分かる.これは,ノ イズにより各行動を特徴づける tri-gram 素性が正確に再現さ れる確率が減り,事前確率の大

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