wkcn commented on issue #18540:
URL:
https://github.com/apache/incubator-mxnet/issues/18540#issuecomment-643061214
The cause is that nd.stack doesn't support zero-shape array.
replacing `self.label` with `self.label = [nd.array([0]) if x.split('/')[-1]
== 'test' else nd.array([1]) for x in self.files]` works.
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