- mean squared error (mse)均方誤差
均方誤差:是指參數估計值與參數真值之差平方的期望值.
- mean_absolute_error或mae平均絕對誤差
- mean_absolute_percentage_error或mape百分平均絕對誤差
- mean_squared_logarithmic_error或msle

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- hing loss (鉸鏈損失, L2損失, .... ,SVM相關, 看不懂先放著...)
- categorical_hinge 一樣啊,不懂,暫時也沒用到
- binary_crossentropy(亦稱作對數損失,logloss)