Extend FPS with an extra ptr argument

[dsciebu]

No description provided.

[codecov-commenter]

Codecov Report

Merging #180 (bbec6f9) into master (32bee64) will decrease coverage by 3.28%.
The diff coverage is 83.33%.

❗ Current head bbec6f9 differs from pull request most recent head a5c1759. Consider uploading reports for the commit a5c1759 to get more accurate results

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@@            Coverage Diff             @@
##           master     #180      +/-   ##
==========================================
- Coverage   97.91%   94.64%   -3.28%     
==========================================
  Files          10       10              
  Lines          96      112      +16     
==========================================
+ Hits           94      106      +12     
- Misses          2        6       +4     

Impacted Files	Coverage Δ
torch_cluster/fps.py	90.24% <83.33%> (-9.76%)	⬇️

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