[Fix] Inference bug for sparse flow map

[MeowZheng]

Fix #132

[codecov]

Codecov Report

Merging #133 (67316a1) into master (dd0755e) will decrease coverage by 0.44%.
The diff coverage is 6.25%.

@@            Coverage Diff             @@
##           master     #133      +/-   ##
==========================================
- Coverage   69.03%   68.58%   -0.45%     
==========================================
  Files          92       92              
  Lines        5135     5148      +13     
  Branches      727      733       +6     
==========================================
- Hits         3545     3531      -14     
- Misses       1475     1502      +27     
  Partials      115      115              

Flag	Coverage Δ
unittests	68.58% <6.25%> (-0.45%)	⬇️

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Impacted Files	Coverage Δ
mmflow/apis/inference.py	24.09% <6.25%> (-4.48%)	⬇️
mmflow/datasets/pipelines/transforms.py	77.50% <0.00%> (-2.34%)	⬇️

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