nudles commented on a change in pull request #488: SINGA -475 add Sign operator
to singa
URL: https://github.com/apache/incubator-singa/pull/488#discussion_r312397599
##########
File path: python/singa/autograd.py
##########
@@ -1828,3 +1828,21 @@ def backward(self, dy):
def leakyrelu(x, a=0.01):
return LeakyRelu(a)(x)[0]
+
+
+class Sign(Operation):
+ def __init__(self):
+ super(Sign, self).__init__()
+
+ def forward(self, a):
+ if training:
+ self.input = a
+ return singa.Sign(a)
+
+ def backward(self, dy):
+ dx = singa.MultFloat(dy, 0.0)
Review comment:
the dx is always 0?
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