[Fix] Fix typo 'metirc'

[azad96]

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Motivation

Fixing a typo so that the code becomes more clear.

Modification

I've changed the typo 'metirc' to 'metric' in mmcls/datasets/base_dataset.py

BC-breaking (Optional)

Does the modification introduce changes that break the backward compatibility of the downstream repositories?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here and update the documentation.

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.
• The documentation has been modified accordingly, like docstring or example tutorials.

After PR:

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

[Ezra-Yu]

LGTM

[codecov]

Codecov Report

Merging #411 (c2f3530) into master (c0a4916) will not change coverage.
The diff coverage is 100.00%.

❗ Current head c2f3530 differs from pull request most recent head 4ef3a04. Consider uploading reports for the commit 4ef3a04 to get more accurate results

@@           Coverage Diff           @@
##           master     #411   +/-   ##
=======================================
  Coverage   76.68%   76.68%           
=======================================
  Files          97       97           
  Lines        5216     5216           
  Branches      853      853           
=======================================
  Hits         4000     4000           
  Misses       1096     1096           
  Partials      120      120           

Flag	Coverage Δ
unittests	76.68% <100.00%> (ø)

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

Impacted Files	Coverage Δ
mmcls/datasets/base_dataset.py	90.80% <100.00%> (ø)

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[mzr1996]

Good, thanks for your contribution!

[OpenMMLab-Coodinator]

Hi @azad96 ！First of all, we want to express our gratitude for your significant PR in this 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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