[Fix] Fix efficient test bug

[Junjun2016]

Fix efficient test bug (#699)

[codecov]

Codecov Report

Merging #702 (71f086b) into master (f5be6e2) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 71f086b differs from pull request most recent head 5f571dc. Consider uploading reports for the commit 5f571dc to get more accurate results

@@           Coverage Diff           @@
##           master     #702   +/-   ##
=======================================
  Coverage   85.18%   85.18%           
=======================================
  Files         105      105           
  Lines        5670     5670           
  Branches      923      923           
=======================================
  Hits         4830     4830           
  Misses        662      662           
  Partials      178      178           

Flag	Coverage Δ
unittests	85.16% <100.00%> (ø)

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

Impacted Files	Coverage Δ
mmseg/core/evaluation/eval_hooks.py	77.27% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update f5be6e2...5f571dc. Read the comment docs.