TypeError: type 'Collector' is not subscriptable

[jaried]

• I have marked all applicable categories:
  • [] exception-raising bug
  • RL algorithm bug
  • documentation request (i.e. "X is missing from the documentation.")
  • new feature request
  • design request (i.e. "X should be changed to Y.")
• 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, gymnasium as gym, torch, numpy, sys
  print(tianshou.__version__, gym.__version__, torch.__version__, numpy.__version__, sys.version, sys.platform)

1.1.0 0.28.1 2.5.1+cu124 1.26.4 3.11.0 | packaged by Anaconda, Inc. | (main, Mar  1 2023, 18:18:21) [MSC v.1916 64 bit (AMD64)] win32

tianshou/examples/discrete/discrete_dqn.py

Line 46 in 151000b

train_collector = ts.data.Collector[CollectStats](

    train_collector = ts.data.Collector[CollectStats](
                      ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
TypeError: type 'Collector' is not subscriptable

[MischaPanch]

This happens because you are using the version of the script from master but a released tianshou version from pypi. You can either

1. Install the latest version of tianshou from master
2. Use the script from the version 1.1.0 (checkout the corresponding tag)
3. Wait for release of 1.2.0, which will happen in February