[Feature] File names in result

[okotaku]

Motivation

Put 'filenames' in test.py out_items to describe which file the result is.

Checklist

Before PR:

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

After PR:

• [x] If the modification has potential influence on downstream or other related projects, this PR should be tested with those projects, like MMDet or MMSeg.
• [x] CLA has been signed and all committers have signed the CLA in this PR.

[codecov[bot]]

Codecov Report

Merging #896 (b33ee14) into dev (812f3d4) will decrease coverage by 0.00%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev     #896      +/-   ##
==========================================
- Coverage   85.45%   85.44%   -0.01%     
==========================================
  Files         132      132              
  Lines        8750     8769      +19     
  Branches     1513     1516       +3     
==========================================
+ Hits         7477     7493      +16     
- Misses       1050     1052       +2     
- Partials      223      224       +1     

Flag	Coverage Δ
unittests	85.39% <100.00%> (+<0.01%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmcls/datasets/base_dataset.py	99.00% <100.00%> (+0.03%)	:arrow_up:
mmcls/datasets/cifar.py	85.71% <100.00%> (+0.78%)	:arrow_up:
mmcls/datasets/dataset_wrappers.py	73.33% <100.00%> (+1.50%)	:arrow_up:
mmcls/datasets/mnist.py	78.26% <100.00%> (+0.98%)	:arrow_up:
mmcls/datasets/builder.py	83.78% <0.00%> (-4.06%)	:arrow_down:

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[okotaku]

I think gt_labels also be put in out_items. What do you think?

[Ezra-Yu]

I think gt_labels also be put in out_items. What do you think?

Yes, it is a good idea if gt_labels is available as an option. This is useful for analyzing results.