[MXNET-40] add multi proposal operator (cpu version) and fix the bug in proposal op (gpu version)

• Type: Improvement
• Status: To Do
• Priority: Major
• Resolution: Unresolved
• Assignee: Unassigned
• Reporter: Jackie Wu
• Created: 07/Mar/18 09:43
• Updated: 23/Mar/18 02:03

Description

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.

Issue Links

• links to: GitHub Pull Request #9939
• links to: PR#9939