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https://issues.apache.org/jira/browse/MXNET-40?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16392201#comment-16392201
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ASF GitHub Bot commented on MXNET-40:
-------------------------------------
wkcn commented on issue #9939: [MXNET-40]add multi proposal operator (cpu
version) and fix the bug in proposal op (gpu version)
URL: https://github.com/apache/incubator-mxnet/pull/9939#issuecomment-370285916
@pengzhao-intel @xinyu-intel
Thank you! I will have a try.
The performance table
name|time (ms)
------|----------
BBoxTransformInv|268
IoUTransformInv|Not used
FilterBox|22
CopyScore|18
ReverseArgsort(unstable sort)|7303
ReorderProposals|338
nms(calculate area)|286
nms(calcuate nms)|7547
allocate memory for workspace|1
copy anchor to workspace_proposal|0
enumrate all shifted anchors|9
copy workspace_proposals_base to workspace_proposals|162
assign foreground scores for each anchor|45
prepare output|3
Total|16002
Using stable sort to sort anchors (ReverseArgsort) will increase about 3000
ms.
Sorry, it seems that I counted the time of all threads. I will update the
performance table.
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> add multi proposal operator (cpu version) and fix the bug in proposal op (gpu
> version)
> --------------------------------------------------------------------------------------
>
> Key: MXNET-40
> URL: https://issues.apache.org/jira/browse/MXNET-40
> Project: Apache MXNet
> Issue Type: Improvement
> Reporter: Kan Wu
> Priority: Major
>
> The multi_proposal operator ({{mxnet.sym.contrib.MultiProposal}}, CPU
> version) is not implemented before.
> I wrote the code about it.
> And I found there was a bug in _proposal.cu_ and _multi_proposal.cu_.
> The {{batch_size}} of the output of _Proposal_ and _MultiProposal_ are both
> {{param_.rpn_post_nms_top_n}}.
> When {{count_anchors < param_.rpn_post_nms_top_n}}, the variable
> {{rpn_post_nms_top_n}} will be {{count_anchors}}, which is less than
> {{param_.rpn_post_nms_top_n}}.
> [https://github.com/apache/incubator-mxnet/blob/master/src/operator/contrib/proposal.cu#L438]
> It will cause the problem that the output whose index is larger than
> {{rpn_post_nms_top_n}} will be _not assigned_.
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