ASF GitHub Bot commented on MXNET-31:

sxjscience commented on issue #9934: [MXNET-31] Support variable sequence 
length in gluon.RecurrentCell 
URL: https://github.com/apache/incubator-mxnet/pull/9934#issuecomment-371034568
   I need to test the VariationalDropoutCell. Will add it after I finish the 
implementation of LayerNorm. Hopefully tonight.

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> Support variable sequence length in gluon.RecurrentCell
> -------------------------------------------------------
>                 Key: MXNET-31
>                 URL: https://issues.apache.org/jira/browse/MXNET-31
>             Project: Apache MXNet
>          Issue Type: New Feature
>            Reporter: Xingjian Shi
>            Assignee: Chris Olivier
>            Priority: Major
> When the input sequences have different lengths, the common approach is to 
> pad them to the same length and feed the padded data into the recurrent 
> neural network. To deal with this scenario, this PR adds a new 
> {{valid_length}} option in {{unroll}}. {{valid_length}} refers to the real 
> length of the sequences before padding. When the {{valid_length}} is given, 
> the last valid state will be returned and the padded portion in the output 
> will be masked to be zero. This feature is essential for implementing a NMT 
> model.

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