access2rohit commented on a change in pull request #19313:
URL: https://github.com/apache/incubator-mxnet/pull/19313#discussion_r502548640
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File path: tests/nightly/test_np_large_array.py
##########
@@ -1874,3 +1873,24 @@ def test_cross():
assert inp.grad[0, 0] == 1 and inp.grad[0, 1] == -1 and inp.grad[0, 2] == 0
assert inp.grad[-1, 0] == 5 and inp.grad[-1, 1] == -4 and inp.grad[-1, 2]
== -1
+
+@use_np
+def test_vstack():
+ inp1 = np.zeros((INT_OVERFLOW, 1))
+ inp2 = np.ones((INT_OVERFLOW, 1))
+ inp1.attach_grad()
+ inp2.attach_grad()
+ with mx.autograd.record():
+ out1 = np.vstack((inp1, inp2))
+ out1.backward()
+ assert out1.shape == (DOUBLE_INT_OVERFLOW, 1)
+ assert out1[INT_OVERFLOW-1, 0] == 0 and out1[-1, 0] == 1
+ assert inp1.grad.shape == inp1.shape
+ assert inp1.grad[-1, -1] == 1
+ with mx.autograd.record():
+ out2 = np.vstack((inp1.flatten(), inp2.flatten()))
+ out2.backward()
+ assert out2.shape == (2, INT_OVERFLOW)
+ assert out2[0, -1] == 0 and out2[1, -1] == 1
+ assert inp2.grad.shape == inp2.shape
+ assert inp2.grad[-1, -1] == 1
Review comment:
New line ?
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