Add a test for AdvancedSubtensor1 with noncontiguous index input.

theano/tensor/tests/test_subtensor.py

@@ -529,6 +529,15 @@ class T_subtensor(unittest.TestCase, utt.TestOptimizationMixin):
             utt.verify_grad(lambda m: m[idx],
                             [data])
 
+    def test_noncontiguous_idx(self):
+        data = rand(4, 2, 3)
+        idx = [2, 2, 0, 0, 1, 1]
+        n = self.shared(data)
+        t = n[self.shared(numpy.asarray(idx))[::2]]
+        self.assertTrue(isinstance(t.owner.op, tensor.AdvancedSubtensor1))
+        val = self.eval_output_and_check(t, op_type=self.adv_sub1, length=2)
+        utt.assert_allclose(data[idx[::2]], val)
+
     def test_err_invalid_list(self):
         n = self.shared(numpy.asarray(5, dtype=self.dtype))
         self.assertRaises(TypeError, n.__getitem__, [0, 0])