Major changes

N/A

New features

N/A

Bug fixes & minor changes

• [ALL] Fixes the NaN issues in unigram model training: https://github.com/google/sentencepiece/issues/851
• [ALL] Fixes the bug in unigram loss computation: https://github.com/google/sentencepiece/issues/628
• [ALL] Fixes the minor bug in BPE token extraction algorithm: https://github.com/google/sentencepiece/issues/318
• [ALL] Increase the number of maximum threads from 128 to 1024. https://github.com/google/sentencepiece/issues/857