[Improvement] cache in rawframedecode

[kennymckormick]

No description provided.

[codecov]

Codecov Report

Merging #1078 (55cbb63) into master (5c24a8b) will increase coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head 55cbb63 differs from pull request most recent head a53f032. Consider uploading reports for the commit a53f032 to get more accurate results

@@            Coverage Diff             @@
##           master    #1078      +/-   ##
==========================================
+ Coverage   83.18%   83.19%   +0.01%     
==========================================
  Files         135      135              
  Lines       10375    10384       +9     
  Branches     1778     1780       +2     
==========================================
+ Hits         8630     8639       +9     
  Misses       1314     1314              
  Partials      431      431              

Flag	Coverage Δ
unittests	83.19% <100.00%> (+0.01%)	⬆️

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Impacted Files	Coverage Δ
mmaction/datasets/pipelines/loading.py	89.08% <100.00%> (+0.12%)	⬆️

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