• I have marked all applicable categories:
  • exception-raising fix
  • algorithm implementation fix
  • documentation modification
  • new feature
• If applicable, I have mentioned the relevant/related issue(s)

Less important but also useful:

• I have visited the source website
• I have searched through the issue tracker for duplicates
• I have mentioned version numbers, operating system and environment, where applicable:

  import tianshou, torch, sys
  print(tianshou.__version__, torch.__version__, sys.version, sys.platform)
  
  # 0.2.5 1.3.1 3.7.7 (default, May  7 2020, 21:25:33) 
  # [GCC 7.3.0] linux