Fix #4396

[kamo-naoyuki]

#4396

[codecov]

Codecov Report

Merging #4398 (2cf5593) into master (7698194) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #4398   +/-   ##
=======================================
  Coverage   82.58%   82.58%           
=======================================
  Files         469      469           
  Lines       40196    40196           
=======================================
  Hits        33194    33194           
  Misses       7002     7002           

Flag	Coverage Δ
test_integration_espnet1	66.58% <ø> (ø)
test_integration_espnet2	49.59% <100.00%> (ø)
test_python	69.37% <100.00%> (ø)
test_utils	23.45% <ø> (ø)

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Impacted Files	Coverage Δ
espnet2/tasks/abs_task.py	75.40% <100.00%> (ø)

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