joddiy commented on a change in pull request #482: SINGA-474 hardsigmoid
operator
URL: https://github.com/apache/incubator-singa/pull/482#discussion_r309671456
##########
File path: python/singa/autograd.py
##########
@@ -358,6 +358,51 @@ def relu(x):
return ReLU()(x)[0]
+class HardSigmoid(Operation):
+ def __init__(self,alpha=0.2,gamma=0.5):
+ super(HardSigmoid, self).__init__()
+ self.alpha=alpha
+ self.gamma=gamma
+
+ def forward(self, x):
+ """Do forward propgation.
+ #y = max(0, min(1, alpha * x + gamma))
+ Args:
+ x (CTensor): matrix
+ Returns:
+ a CTensor for the result
+ """
+ if training:
+ self.input = x
+
+ x = singa.AddFloat(singa.MultFloat(x,self.alpha),self.gamma)
+ x = singa.ReLU(x)
+ mask = singa.LTFloat(x, 1.0)
+ mask2 = singa.GEFloat(x, 1.0)
+
+ ans = singa.__add__(singa.__mul__(x, mask),mask2)
Review comment:
Please refer to the
[implement](https://github.com/tensorflow/tensorflow/blob/6e60889d0e31c7ee13004322110eb77507fb2177/tensorflow/python/keras/backend.py#L4379-L4383)
of Tensorflow.
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