softplus.py 文件源码

def forward_cpu(self, inputs):
        x, = inputs
        # y = log(1 + exp(beta * x)) / beta
        bx = self.beta * x
        y = (numpy.fmax(bx, 0) +
             numpy.log1p(numpy.exp(-numpy.fabs(bx)))) * self.beta_inv
        return utils.force_array(y.astype(x.dtype)),