stephenrawls commented on issue #15278: fixing var-seq-len rnn backward() operator URL: https://github.com/apache/incubator-mxnet/pull/15278#issuecomment-503774511 Just to keep the ticket updated: I have confirmed the following facts: 1. If I set each sequence_length entry to the maximum sequence length, then my gradients between the reference net and the var-seq-len net do match 2. When I set cudnn debugging on, I *am* calling the appropriate "unpacked enabled" version of the cudnn api and the appropriate seq-len values are passed in. i.e. I set: ``` export CUDNN_LOGINFO_DBG=1 export CUDNN_LOGDEST_DBG=/home/ec2-user/cudnn.dbg.log ``` And I look at the resulting output and see: I! CuDNN (v7501) function cudnnRNNForwardTrainingEx() called: ... layout: type=cudnnRNNDataLayout_t; val=CUDNN_RNN_DATA_LAYOUT_SEQ_MAJOR_UNPACKED (0);
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