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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