human
Here's a good function header given the following:
I wrote the below code

    from tensorflow.python.ops import gen_nn_ops
    @tf.RegisterGradient('GuidedReLU')
    def GuidedReluGrad(op, grad):
        return tf.where((0.0 < grad), gen_nn_ops._relu_grad(grad, op.outputs[0]), tf.zeros(grad.get_shape()))
    g = tf.get_default_graph()
    with g.gradient_override_map({'Relu': 'GuidedReLU'}):
        (yield)

What's a good function header?
assistant
#Here's a good function header.

@contextmanager
def guided_relu():