elem times backward pass test

contrib/Python/cntk/test/test_ops.py

@@ -18,10 +18,10 @@ def _test(root_node, expected, clean_up=True, backward_pass = False, input_node
         result = ctx.eval(root_node, None, backward_pass, input_node)
 
         assert len(result) == len(expected)
-        for res, exp in zip(result, expected):            
+        for res, exp in zip(result, expected):  
+            print ("asdf")
             print(res)
             print(exp)
-            print("===========#####")
             assert np.allclose(res, exp)
             assert res.shape == AA(exp).shape
 
@@ -92,6 +92,33 @@ def test_op_mul_input_seq(left_arg, right_arg):
     result = I(left_arg, has_sequence_dimension=True) * right_arg
     _test(result, expected, False)
 
+@pytest.mark.parametrize("left_arg, right_arg", [
+    #([30, 2], [10, 3]),    
+    ([[30,40], [1,2]], [[30,40], [1,2]]),    
+    ])
+
+def test_elemmul_backward(left_arg, right_arg):
+     
+     expected = AA(right_arg)
+     # sequence of 1 element, since we have has_sequence_dimension=False
+     expected = [expected] 
+     # batch of one sample
+     expected = [expected]
+     a = I([left_arg], has_sequence_dimension=False)
+     m = a * right_arg     
+     _test(m, expected, clean_up=False, backward_pass = True, input_node = a)
+     
+     expected = AA(left_arg)
+     # sequence of 1 element, since we have has_sequence_dimension=False
+     expected = [expected] 
+     # batch of one sample
+     expected = [expected]
+     b = I([left_arg], has_sequence_dimension=False)
+     #b.var_name = 'v2'
+     m = left_arg * b
+     _test(m, expected, clean_up=False, backward_pass = True, input_node = b)
+     
+     
 @pytest.mark.parametrize("left_arg, right_arg", [
     ([0],[0]),              # grad(Cos(0)) = -Sin(0) = 0
     ([1.57079633],[-1]),     # grad(Cos(pi/2)) = -Sin(pi/2) = -1