small opt speed up

theano/tensor/opt.py

@@ -1435,18 +1435,18 @@ def local_useless_elemwise(node):
                 return [T.fill(node.inputs[0],
                                T.constant(1.0,
                                           dtype=node.outputs[0].type.dtype))]
-        if node.op.scalar_op == theano.scalar.neq and len(node.inputs) == 2:
+        elif node.op.scalar_op == theano.scalar.neq and len(node.inputs) == 2:
             if node.inputs[0] == node.inputs[1]:
             # it is the same var in the graph. That will always be false
                 return [T.fill(node.inputs[0],
                                T.constant(0.0,
                                           dtype=node.outputs[0].type.dtype))]
-        if node.op.scalar_op == theano.scalar.mul and len(node.inputs) == 1:
+        elif node.op.scalar_op == theano.scalar.mul and len(node.inputs) == 1:
             return [node.inputs[0]]
-        if node.op.scalar_op == theano.scalar.add and len(node.inputs) == 1:
+        elif node.op.scalar_op == theano.scalar.add and len(node.inputs) == 1:
             return [node.inputs[0]]
 
-        if (node.op.scalar_op == theano.scalar.identity
+        elif (node.op.scalar_op == theano.scalar.identity
             and len(node.inputs) == 1):
             return [node.inputs[0]]