stephenrawls commented on issue #13968: Hybridization SequenceLast Bug URL: https://github.com/apache/incubator-mxnet/issues/13968#issuecomment-457892819 @szha thanks for the tip. The stack trace is revealing the error happens in the backward pass at a specific line checking that a certain array is non-empty, which is confirmed by our work around of detaching the problematic variable from the computation graph. (And since the variable in question *shouldn't* have any gradient flowing through it anyway, this does not effect our calculations and is an effective work around). But I'll play around with MXNET_ENGINE_TYPE and see if I can get a more reproducible error.
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