nudles commented on a change in pull request #496: SINGA-474 Mean operator
URL: https://github.com/apache/incubator-singa/pull/496#discussion_r313776492
 
 

 ##########
 File path: python/singa/autograd.py
 ##########
 @@ -354,6 +354,41 @@ def backward(self, dy):
         return singa.__mul__(dy, dx)
 
 
+def relu(x):
+    return ReLU()(x)[0]
+
+class Mean(Operation):
+    def __init__(self):
+        super(Mean, self).__init__()
+
+    def forward(self, *l):
+        """
+        Args:
+            l: a list of CTensor
+            element-wise mean operator
+        Returns:
+            a new CTensor
+        """
+        if training:
+            self.l = len(l)
+        assert(len(l)>0);
+        x = l[0]
+        for i in range(1,len(l)):
+            x = singa.__add__(x,l[i])
 
 Review comment:
   use inplace addition.
   like x+= l[i]

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