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Posted to dev@singa.apache.org by "wangwei (JIRA)" <ji...@apache.org> on 2016/12/16 07:51:59 UTC

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

wangwei created SINGA-283:
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             Summary: 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


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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