Add non-agnostic NMS for exporting ONNX

[zhiqwang]

No description provided.

[codecov]

Codecov Report

Merging #420 (b41d859) into main (a744106) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #420   +/-   ##
=======================================
  Coverage   98.58%   98.58%           
=======================================
  Files          11       11           
  Lines         778      778           
=======================================
  Hits          767      767           
  Misses         11       11           

Flag	Coverage Δ
unittests	98.58% <ø> (ø)

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