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Posted to dev@singa.apache.org by "wangwei (JIRA)" <ji...@apache.org> on 2017/01/11 06:45:58 UTC

[jira] [Resolved] (SINGA-283) Fix a bug of net.py backward function for layers with multiple inputs

     [ https://issues.apache.org/jira/browse/SINGA-283?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

wangwei resolved SINGA-283.
---------------------------
    Resolution: Fixed

> Fix a bug of net.py backward function for layers with multiple inputs
> ---------------------------------------------------------------------
>
>                 Key: SINGA-283
>                 URL: https://issues.apache.org/jira/browse/SINGA-283
>             Project: Singa
>          Issue Type: Bug
>            Reporter: wangwei
>            Assignee: wangwei
>
> For layers with multiple inputs, their source layers are visited in the reversed order, e.g., s1, s2, s3 -> o (forward),  => o, s3, s2, s1 (backward). Consequently, we need to reverse the order of the output gradients of o.
> There is a bug of the reverse operation.
> It could be fixed by: reverse(list) --> list[::-1], the first one returns a reverselistiterator instead of a list.



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