[Fix]: Change imgs_per_gpu to samples_per_gpu MAE

[YuanLiuuuuuu]

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Motivation

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Modification

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Checklist

Before PR:

• Pre-commit or other linting tools are used to fix the potential lint issues.
• Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
• The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
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[codecov]

Codecov Report

Merging #278 (df05277) into dev_v0.9.0 (b859828) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           dev_v0.9.0     #278   +/-   ##
===========================================
  Coverage       70.05%   70.05%           
===========================================
  Files             113      113           
  Lines            4051     4051           
  Branches          655      655           
===========================================
  Hits             2838     2838           
  Misses           1089     1089           
  Partials          124      124           

Flag	Coverage Δ
unittests	70.05% <ø> (ø)

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