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                網絡輸出是一個概率值(網絡最后一層使用 sigmoid 激活函數,僅包含一個單元) **損失器:**binary_crossentropy(**二元交叉熵**),還可以使用mean_squared_error(**均方誤差**)。 輸出概率值的模型,**交叉熵**(crossentropy)往往是最好的選擇。 > 交叉熵是來自于信息論領域的概念,用于衡量概率分布之間的距離,在這個例子中就是真實分布與預測值之間的距離。
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