joddiy commented on a change in pull request #484: SINGA -475 add Div operator
implementation to singa
URL: https://github.com/apache/incubator-singa/pull/484#discussion_r309663270
##########
File path: python/singa/autograd.py
##########
@@ -1787,6 +1787,22 @@ def abs(a):
return Abs()(a)[0]
+class Div(Operation):
+ def _init_(self):
+ super(Div, self)._init_()
+
+ def forward(self, a, b):
+ if training:
+ self.input = (a, b)
+ return singa.__div__(a, b)
+
+ def backward(self, dy):
+ return singa.__div__(dy, self.input[0]), singa.__mul__(dy,
self.input[1])
Review comment:
the gradients should be:
dy/dx_1 = b^-1
dy/dx_2 = -a*b^-2
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