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https://issues.apache.org/jira/browse/MXNET-40?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16392404#comment-16392404
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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-370133350
@pengzhao-intel Here is the testing code.
https://gist.github.com/wkcn/4a09c142bc9886b45b5a23461bbe4733
I found that I made a mistake that I didn't use `nd.waitall()` to test the
performance.
If not using `nd.waitall()`, the calculation will not execute because of
lazy-evaluation.
performance|CPU(no omp)|CPU(omp)|GPU
-----|-------|---|-----
Time(s)|33.899|12.432|4.435
However, when I set the environment variables `MXNET_OMP_MAX_THREADS` or
`OMP_NUM_THREADS`, it may bring bad performance.
Update: 2018-03-09 (626296b)
performance|CPU(no omp)|CPU(omp)|GPU
-----|-------|---|-----
Time(s)|33.899|5.049|4.435
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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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