New Features

• [New Features][ESPnet1] CTC segmentation #2301 by @lumaku
• [New Features][ESPnet2] Support multiple averaged nbest models #2353 by @kamo-naoyuki
• [New Features][ESPnet2] Support recursive add in pack_funcs and add images to packed model #2367 by @kamo-naoyuki

Bugfix

• [Bugfix][ASR][ESPnet1] remove ff_scale from conformer constructor arguments #2356 by @koji-okabe-hub
• [Bugfix][ASR][ESPnet2] use lm_exp instead of lm_tag for inference_tag #2352 by @kamo-naoyuki
• [Bugfix][CI][ESPnet1][Installation] Remove ctc_segmentation temporary #2385 by @kan-bayashi
• [Bugfix][ESPnet1] Fix import error of conformer module #2384 by @kan-bayashi
• [Bugfix][ESPnet1] Fix issue https://github.com/espnet/espnet/issues/2211 #2219 by @Emrys365
• [Bugfix][ESPnet2] Add missing init.py #2326 by @kan-bayashi
• [Bugfix][ESPnet2] Fix --out_filename option: format_wav_scp.sh #2348 by @kamo-naoyuki
• [Bugfix][ESPnet2] Fix amp #2362 by @kamo-naoyuki
• [Bugfix][ESPnet2] add egs2/an4/asr1/local/path.sh #2343 by @kamo-naoyuki
• [Bugfix][ESPnet2] fix recursive add: espnet2/main_funcs/pack_funcs.py #2369 by @kamo-naoyuki
• [Bugfix][ESPnet2] remove unused import #2331 by @kamo-naoyuki
• [Bugfix][ESPnet2][Installation][Typo] fix typo #2344 by @kamo-naoyuki
• [Bugfix][ESPnet2][README] Fix typo #2372 by @Piteryo
• [Bugfix][ESPnet2][TTS] make vietnamese_cleaner to opiton #2341 by @kamo-naoyuki
• [Bugfix][Installation] Fix python version check for chainer #2342 by @kamo-naoyuki
• [Bugfix][Installation] add undefined variable: check_pytorch_cuda_compatibility.py #2361 by @kamo-naoyuki
• [Bugfix][TTS] Fix device allocation error in guided attention loss #2282 #2317 by @kan-bayashi

Documentation

• [Documentation] updated comment on the documentation #2351 by @GauravPandey892
• [Documentation][ESPnet2] Update TTS README #2316 by @kan-bayashi
• [Documentation][ESPnet2][README] Update ESPnet2 TTS README #2376 by @kan-bayashi
• [Documentation][ESPnet2][README][TTS] Update README #2330 by @kan-bayashi
• [Documentation][Installation] Devide setup_python.sh into setup_venv.sh and setup_python.sh #2382 by @kamo-naoyuki
• [Documentation][Installation] add a description about check install. #2360 by @sw005320
• [Documentation][README] CTC segmentation - Demo #2347 by @lumaku
• [Documentation][README] Update README.md #2379 by @kamo-naoyuki

Enhancement

• [Enhancement][ESPnet2] Change the default inference model to averaged model instead of the best #2346 by @kamo-naoyuki
• [Enhancement][ESPnet2][TTS] Add pitch and energy stats in packing #2350 by @kan-bayashi
• [Enhancement][Installation] Add checking for pytorch-cuda compatibility in Makefile #2334 by @kamo-naoyuki
• [Enhancement][Installation] Show raw error message when failed to import packages #2374 by @kamo-naoyuki

Refactoring

• [Refactoring] Apply new version black #2366 by @kamo-naoyuki
• [Refactoring][ASR][ESPnet2] Not to add _sp to $asr_exp if --asr_exp option is specified #2368 by @kamo-naoyuki
• [Refactoring][CI][ESPnet1][ESPnet2][Installation] Add installers for sctk and sph2pipe and create tools/extra_path.sh #2332 by @kamo-naoyuki
• [Refactoring][ESPnet1][Recipe] Disable preparation for lm in wsj recipe #2373 by @kamo-naoyuki
• [Refactoring][ESPnet2] Update Task design #2345 by @kamo-naoyuki
• [Refactoring][ESPnet2][SE] Remove unused option from enh.sh:--feats_normalize #2325 by @kamo-naoyuki

Recipe

• [Recipe][ASR][ESPnet1] MGB-2 #2289 by @AmirHussein96
• [Recipe][ASR][ESPnet1] Remove duplicated class definition of Conformer and update some new results of Aishell1 and Switchboard. #2364 by @pengchengguo
• [Recipe][ASR][ESPnet2][README] ASR WSJ RESULT update: Tuning LM #2355 by @kamo-naoyuki
• [Recipe][ASR][ESPnet2][README] add pretrained model link #2378 by @kamo-naoyuki

CI

• [CI][README] Update ubuntu images in circle ci #2349 by @ShigekiKarita
• [CI][mergify] Update .mergify.yml #2333 by @kamo-naoyuki
• [CI][mergify] Update .mergify.yml #2354 by @kamo-naoyuki

Acknowledgements

Special thanks to @AmirHussein96, @Emrys365, @GauravPandey892, @Piteryo, @ShigekiKarita, @kamo-naoyuki, @kan-bayashi, @koji-okabe-hub, @lumaku, @pengchengguo, @sw005320.