[FIX] Update NAN files in flyingthings3d_subset

[lhao0301]

As title. related issue #88

[CLAassistant]

All committers have signed the CLA.

[MeowZheng]

Many thanks for your contribution

I'll double-check it today

[codecov]

Codecov Report

Merging #94 (62988c5) into master (6da61bf) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #94   +/-   ##
=======================================
  Coverage   68.02%   68.02%           
=======================================
  Files          86       86           
  Lines        4895     4895           
  Branches      705      705           
=======================================
  Hits         3330     3330           
  Misses       1457     1457           
  Partials      108      108           

Flag	Coverage Δ
unittests	68.02% <ø> (ø)

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Impacted Files	Coverage Δ
mmflow/datasets/flyingthings3d_subset.py	87.75% <ø> (ø)
mmflow/datasets/pipelines/transforms.py	79.83% <0.00%> (ø)

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[MeowZheng]

I have checked it.

[OpenMMLab-Assistant003]

Hi @lhao0301！First of all, we want to express our gratitude for your significant PR in the MMFlow project. Your contribution is highly appreciated, and we are grateful for your efforts in helping improve this open-source project during your personal time. We believe that many developers will benefit from your PR.

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Thank you again for your contribution❤ @lhao0301