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برق و الکترونیک::
آنتروپی متقاطع
Minimizing the cost function shown in Equation 4-22, called the cross entropy, should lead to this objective because it penalizes the model when it estimates a low probability for a target class.
Cross entropy is frequently used to measure how well a set of estimated class probabilities match the target classes (we will use it again several times in the following chapters).
Cross entropy cost function
Cross entropy gradient vector for class k
The output layer relies on the softmax function, and the cost function is cross entropy (introduced in Chapter 4).
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