[Fixed] Fix issue #298

[xiliu8006]

Avoid 4 dims points as the input of points_in_boxes functions(#289 )

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[codecov]

Codecov Report

Merging #356 (33e9686) into master (e5f55bd) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #356      +/-   ##
==========================================
- Coverage   49.69%   49.68%   -0.01%     
==========================================
  Files         174      174              
  Lines       11758    11760       +2     
  Branches     1838     1838              
==========================================
  Hits         5843     5843              
- Misses       5555     5557       +2     
  Partials      360      360              

Flag	Coverage Δ
unittests	49.68% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmdet3d/ops/roiaware_pool3d/points_in_boxes.py	30.30% <0.00%> (-1.96%)	⬇️

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