joddiy commented on a change in pull request #528: SINGA 475 - add logical
operator: and, or, xor, not & negative, reciprocal
URL: https://github.com/apache/incubator-singa/pull/528#discussion_r325462186
##########
File path: python/singa/autograd.py
##########
@@ -2522,3 +2523,144 @@ def backward(self, dy):
def max(a,b):
return Max()(a,b)[0]
+
+class And(Operation):
+ def __init__(self):
+ super(And, self).__init__()
+
+ def forward(self, a, b):
+ m = singa.__div__(a,b)
+
+ mask0 = singa.GEFloat(m,1)
+ mask1 = singa.LEFloat(m,1)
+ cur = singa.__mul__(mask0,mask1)
+
+ return cur
+
+ def backward(self, dy):
+ assert 0,('no gradient')
+ return None
+
+def _and(a,b):
+ return And()(a,b)[0]
+
+
+class Or(Operation):
+ def __init__(self):
+ super(Or, self).__init__()
+
+ def forward(self, a, b):
+ #find equal element-wise
+ m = singa.__sub__(a,b)
Review comment:
if a = -b, the Signs of them are, 1, and -1, and then, you take a square on
it, the result will be 1 and 1, and you add them together, is 2, take the Sign
again, you get a 1 finally.
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