reminisce commented on a change in pull request #14638: [MXNET-1382] Add the 
index_array operator
URL: https://github.com/apache/incubator-mxnet/pull/14638#discussion_r283200807
 
 

 ##########
 File path: tests/python/unittest/test_operator.py
 ##########
 @@ -8054,6 +8054,68 @@ def test_image_normalize():
     # check backward using finite difference
     check_numeric_gradient(img_norm_sym, [data_in_4d], atol=0.001)
 
+@with_seed()
+def test_index_array_default():
+    for shape in [(10,), (7, 5, 29), (5, 7, 11, 13, 17, 19)]:
+        data  = mx.symbol.Variable("data")
+        index_array = mx.sym.contrib.index_array(data)
+
+        input_array = np.ones(shape)
+        mgrid = np.mgrid[tuple(slice(0, x) for x in shape)]
+        expected = np.stack(mgrid, axis=-1)
+
+        check_symbolic_forward(index_array, [input_array], [expected])
+        check_symbolic_backward(index_array, [input_array], 
[np.ones(expected.shape)], [np.zeros_like(input_array)])
+
+@with_seed()
+def test_index_array_default_zero_dim():
+    with mx.np_compat(active=True):
+        data  = mx.symbol.Variable("data")
+        index_array = mx.sym.contrib.index_array(data)
+
+        input_array = np.ones(())
+        expected = np.zeros((0,))
+
+        check_symbolic_forward(index_array, [input_array], [expected])
+        check_symbolic_backward(index_array, [input_array], 
[np.ones(expected.shape)], [np.zeros_like(input_array)])
+
+@with_seed()
+def test_index_array_default_zero_size():
+    with mx.np_compat(active=True):
 
 Review comment:
   Same as above, please use the decorator `mx.use_np_compat`.

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