[CI/Build] fix flaky test #3602
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When the random batchsize is
1, 2, 3, 4, we will pad them into1, 2, 4, 4, i.e._get_graph_batch_size(original_size), instead of aligning them to be a multiple of8.That's why the test is flaky. The code is good, but the test is wrong.
Since these tests are quite cheep, I use
pytest.mark.parametrizeto run all of the possibilities.