stephenrawls opened a new pull request #15278: fixing var-seq-len rnn backward() operator URL: https://github.com/apache/incubator-mxnet/pull/15278 ## Description ## This PR fixes the problem mentioned here: https://github.com/apache/incubator-mxnet/issues/15268 NOTE: this is in a preliminary state currently. The backward() pass now works without crashing and produces a gradient. HOWEVER, the unit test I added to confirm the gradient we get matches what we expect is failing because the gradients do not match. Due to time-sensitive nature of the PR I am creating it early in case more eyeballs can help. @szha @roywei
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