implemented connection_pattern for elemwise

theano/scalar/basic.py

@@ -1548,7 +1548,7 @@ class Second(BinaryScalarOp):
     def c_code(self, node, name, (x, y), (z, ), sub):
         return "%(z)s = %(y)s;" % locals()
 
-    def connection_pattern(self):
+    def connection_pattern(self, node):
 
         # x is never connected because its elements are never used
         # y is connected because its elements are copied over

theano/tensor/elemwise.py

@@ -618,6 +618,14 @@ class Elemwise(Op):
 
         return rval
 
+
+    def connection_pattern(self, node):
+
+        if hasattr(self.scalar_op, 'connection_pattern'):
+            return self.scalar_op.connection_pattern(node)
+
+        return [[True for output in node.outputs] for ipt in node.inputs]
+
     def grad(self, inputs, ograds):
 
         #compute grad with respect to broadcasted input