nudles commented on a change in pull request #510: SINGA 475 - add min operator
URL: https://github.com/apache/incubator-singa/pull/510#discussion_r313761395
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File path: python/singa/autograd.py
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@@ -1945,3 +1945,29 @@ def backward(self, dy):
def sub(a, b):
return Sub()(a,b)[0]
+
+
+class Min(Operation):
+ def __init__(self):
+ super(Min, self).__init__()
+
+ def forward(self, a, b):
+ m = singa.__sub__(a,b)
+ mask0 = singa.LTFloat(m,0)
+ mask00 = singa.__mul__(singa.LEFloat(m,0),a)
+ mask1 = singa.GTFloat(m,0)
+ mask11=singa.__mul__(mask1,b)
+ mask = singa.__add__(mask00,mask11)
+
+ if training:
+ self.mask = mask
+ self.mask0 = mask0
+ self.mask1 = mask1
+ return mask
+
+ def backward(self, dy):
+ return (self.mask0,self.mask1)
Review comment:
dy is not multiplied in the backward?
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