costOperations.py 文件源码

def perform(self, a, y):
        """Perform costOperation

        Parameters
        ----------
        a : np.array
            Predictions
        y : np.array
            Data labels


        Returns
        -------
        np.array
            Output data
        """
        predLog = np.nan_to_num(-np.log(a))
        cEntropyMat = np.multiply(y, predLog)
        return (1.0 / self.nExamples) * np.sum(cEntropyMat)