tensorflow_backend.py 文件源码

def elu(x, alpha=1.):
    '''Exponential linear unit.

    # Arguments
        x: Tensor to compute the activation function for.
        alpha: scalar
    '''
    res = tf.nn.elu(x)
    if alpha == 1:
        return res
    else:
        return tf.select(x > 0, res, alpha * res)