wkcn edited a comment on issue #11064: Flaky test: test_operator.test_op_roi_align URL: https://github.com/apache/incubator-mxnet/issues/11064#issuecomment-446055482 In this unittest, the `real_output` is computed in `float64`, so there is some float precision problem. When MXNET_TEST_SEED=35650200, the error shows that: ``` Error 4.049840 exceeds tolerance rtol=0.000010, atol=0.000000. Location of maximum error:(6, 0, 0, 1), a=0.005887, b=0.005887 a: array([[[[ 172.60527039, 173.5171814 , 174.42907715, 175.34100342], [ 195.92706299, 196.83895874, 197.75085449, 198.6627655 ], [ 219.24882507, 220.16073608, 221.07263184, 221.98455811]],... b: array([[[[ 172.60527039, 173.5171814 , 174.42907715, 175.34100342], [ 195.92706299, 196.83895874, 197.75085449, 198.6627655 ], [ 219.24884033, 220.16075134, 221.07266235, 221.98455811]],... ``` I think `atol` should be not 0.
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