[GitHub] [incubator-mxnet] ma-hei commented on pull request #18445: updating ubuntu_cpu base image to 20.04 to observe failing tests regarding Python 3.8

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ma-hei commented on pull request #18445:
URL: https://github.com/apache/incubator-mxnet/pull/18445#issuecomment-653149747


   Thanks @leezu, I think I found the underlying cause of the test failure in unittest/onnx/test_node.py::TestNode::test_import_export. In onnx 1.7, the input of the Pad operator has changed. We can see this by comparing https://github.com/onnx/onnx/blob/master/docs/Operators.md#Pad to https://github.com/onnx/onnx/blob/master/docs/Changelog.md#Pad-1. I believe I can fix this test and I'm working on that now. However the same test will not pass with onnx 1.5 anymore after that (but at least we know how to fix it, I guess). I assume the stacktrace you posted above from the unrelated cd job probably has some similar cause. 


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