Remove six

[kamo-naoyuki]

No description provided.

[codecov]

Codecov Report

Merging #4988 (6a28a63) into master (ab72501) will decrease coverage by 0.01%.
The diff coverage is 87.36%.

@@            Coverage Diff             @@
##           master    #4988      +/-   ##
==========================================
- Coverage   77.01%   77.00%   -0.01%     
==========================================
  Files         606      606              
  Lines       53770    53748      -22     
==========================================
- Hits        41410    41388      -22     
  Misses      12360    12360              

Flag	Coverage Δ
test_integration_espnet1	66.29% <65.21%> (-0.05%)	⬇️
test_integration_espnet2	47.76% <47.36%> (-0.01%)	⬇️
test_python	66.84% <82.10%> (-0.01%)	⬇️
test_utils	23.28% <1.81%> (-0.08%)	⬇️

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Impacted Files	Coverage Δ
espnet/asr/chainer_backend/asr.py	71.92% <0.00%> (-0.14%)	⬇️
espnet/lm/lm_utils.py	87.82% <0.00%> (-0.08%)	⬇️
...spnet/nets/chainer_backend/transformer/training.py	22.30% <0.00%> (-0.60%)	⬇️
espnet/nets/pytorch_backend/ctc.py	53.71% <0.00%> (-0.38%)	⬇️
espnet/lm/chainer_backend/lm.py	85.30% <75.00%> (-0.06%)	⬇️
espnet/nets/pytorch_backend/rnn/decoders.py	93.91% <90.47%> (-0.02%)	⬇️
...net/nets/chainer_backend/deterministic_embed_id.py	68.23% <100.00%> (-0.37%)	⬇️
espnet/nets/chainer_backend/e2e_asr_transformer.py	69.49% <100.00%> (-0.11%)	⬇️
espnet/nets/chainer_backend/rnn/decoders.py	92.65% <100.00%> (-0.03%)	⬇️
espnet/nets/chainer_backend/rnn/encoders.py	98.30% <100.00%> (-0.02%)	⬇️
... and 12 more

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