New Features

• [New Features][ESPnet1][ASR] Transducer v4 #2444 by @b-flo
• [New Features][ESPnet2] Support audio_format=flac.ark, wav.ark #2451 by @kamo-naoyuki
• [New Features][ESPnet2][ASR] Support conformer encoder in ESPnet2 ASR #2515 by @kan-bayashi

Bugfix

• [Bugfix][ESPnet1] Fixed IndexError in BatchBeamSearch.post_process() (#2483) #2484 by @kan-bayashi
• [Bugfix][ESPnet1][LM] fix multigpu bug if pytorch>=1.5 #2492 by @kamo-naoyuki
• [Bugfix][ESPnet2] remove cleaner #2529 by @kamo-naoyuki
• [Bugfix][ESPnet2][TTS] Fix TTS inference bug for GST + Fastspeech2 #2498 by @kan-bayashi

Documentation

• [Documentation] Update espnet2_tutorial.md #2528 by @kamo-naoyuki
• [Documentation] Update espnet2_tutorial.md #2532 by @kamo-naoyuki
• [Documentation] Update espnet2_tutorial.md #2534 by @kamo-naoyuki
• [Documentation] Update notebook submodule #2499 by @kan-bayashi
• [Documentation][ESPnet1] Small fixes for transducer #2514 by @b-flo
• [Documentation][ESPnet2][README][TTS] Update ESPnet2 TTS README #2516 by @kan-bayashi
• [Documentation][README] Update README #2504 by @kan-bayashi
• [Documentation][README][ESPnet1] CTC segmentation - checks for blank chars and RNN models #2535 by @lumaku

Recipe

• [Recipe][ESPnet1][ASR] add conformer results for librispeech #2510 by @yuekaizhang
• [Recipe][ESPnet2][ASR] Update ESPnet2 CSJ Transformer results #2497 by @kan-bayashi
• [Recipe][ESPnet2][TTS] Add results for ESPnet2 TTS #2503 by @kan-bayashi
• [Recipe][ESPnet2][TTS] Update Transformer-TTS config #2494 by @kan-bayashi
• [Recipe][ESPnet2][TTS] Update Transformer-TTS configs #2502 by @kan-bayashi

Refactoring

• [Refactoring] Modify uttid to "${spkid}-${uttid}" for trn files #2527 by @kamo-naoyuki
• [Refactoring][ESPnet1][ASR][LM] Remove all future lines #2481 by @ShigekiKarita
• [Refactoring][ESPnet1][ASR][MT][ST] Unify arguments #2506 by @hirofumi0810
• [Refactoring][ESPnet1][ESPnet2][TTS] Refactor length regulator to improve the speed #2482 by @kan-bayashi
• [Refactoring][ESPnet1][MT][ST] Refactor decoding for translation tasks #2501 by @hirofumi0810
• [Refactoring][ESPnet2] Change add_scalars to add_scalar for tensorboard SummaryWriter #2525 by @kamo-naoyuki

CI

• [CI][ASR] Make test_e2e_asr.py faster #2488 by @ShigekiKarita
• [CI][ASR] Make test_e2e_asr_maskctc.py faster. #2493 by @ShigekiKarita
• [CI][ASR] Make test_recog.py faster #2486 by @ShigekiKarita
• [CI][ESPnet1][ASR] make test_e2e_asr_mulenc.py faster #2480 by @ruizhilijhu
• [CI][ESPnet1][Installation] Update shellcheck url. #2500 by @ShigekiKarita
• [CI][ESPnet2][Installation] Limit test execution time to 2.0 sec #2520 by @ShigekiKarita
• [CI][SE] Make test_beamformer_net.py faster #2489 by @ShigekiKarita
• [CI][SE] shorten test time for tasnet #2491 by @LiChenda

Other

• [Installation] Update h5py version to avoid errors in Python3.8 #2519 by @shigabeev
• [Docker] Docker Updates #2509 by @Fhrozen

Acknowledgements

Special thanks to @Fhrozen, @LiChenda, @ShigekiKarita, @b-flo, @hirofumi0810, @kamo-naoyuki, @kan-bayashi, @lumaku, @ruizhilijhu, @shigabeev, @yuekaizhang.