超！備忘録！ml-agents

ml-agentsを利用していく中，遭遇した現象（事故）について載っけていきます。見直しとか全くしていません。あくまで<b>個人用のメモ</b>です。

### エラー１：多分ml-agentsインストールできていない

絶対気のせいだが，`pip install protobuf==3.20.3 && pip install numpy==1.23.5`（protpbufとnumpyのダウングレード）を実行してから`mlagents-learn --help`ができない。勝手に消されたのかは分からない。（インストールしていなかった，ということはない）
``` console:エラー１
mlagents-learn --help       
Traceback (most recent call last):
  File "/Users/[USER_NAME]/opt/anaconda3/envs/ml-test/bin/mlagents-learn", line 5, in <module>
    from mlagents.trainers.learn import main
  File "/Users/[USER_NAME]/opt/anaconda3/envs/ml-test/lib/python3.10/site-packages/mlagents/trainers/learn.py", line 2, in <module>
    from mlagents import torch_utils
  File "/Users/[USER_NAME]/opt/anaconda3/envs/ml-test/lib/python3.10/site-packages/mlagents/torch_utils/__init__.py", line 1, in <module>
    from mlagents.torch_utils.torch import torch as torch  # noqa
  File "/Users/[USER_NAME]/opt/anaconda3/envs/ml-test/lib/python3.10/site-packages/mlagents/torch_utils/torch.py", line 6, in <module>
    from mlagents.trainers.settings import TorchSettings
  File "/Users/[USER_NAME]/opt/anaconda3/envs/ml-test/lib/python3.10/site-packages/mlagents/trainers/settings.py", line 25, in <module>
    from mlagents.trainers.cli_utils import StoreConfigFile, DetectDefault, parser
  File "/Users/[USER_NAME]/opt/anaconda3/envs/ml-test/lib/python3.10/site-packages/mlagents/trainers/cli_utils.py", line 5, in <module>
    from mlagents_envs.environment import UnityEnvironment
  File "/Users/[USER_NAME]/opt/anaconda3/envs/ml-test/lib/python3.10/site-packages/mlagents_envs/environment.py", line 12, in <module>
    from mlagents_envs.side_channel.side_channel import SideChannel
  File "/Users/[USER_NAME]/opt/anaconda3/envs/ml-test/lib/python3.10/site-packages/mlagents_envs/side_channel/__init__.py", line 5, in <module>
    from mlagents_envs.side_channel.default_training_analytics_side_channel import (  # noqa
  File "/Users/[USER_NAME]/opt/anaconda3/envs/ml-test/lib/python3.10/site-packages/mlagents_envs/side_channel/default_training_analytics_side_channel.py", line 7, in <module>
    from mlagents_envs.communicator_objects.training_analytics_pb2 import (
  File "/Users/[USER_NAME]/opt/anaconda3/envs/ml-test/lib/python3.10/site-packages/mlagents_envs/communicator_objects/training_analytics_pb2.py", line 6, in <module>
    from google.protobuf import descriptor as _descriptor
  File "/Users/[USER_NAME]/opt/anaconda3/envs/ml-test/lib/python3.10/site-packages/google/protobuf/descriptor.py", line 47, in <module>
    from google.protobuf.pyext import _message
ImportError: dlopen(/Users/[USER_NAME]/opt/anaconda3/envs/ml-test/lib/python3.10/site-packages/google/protobuf/pyext/_message.cpython-310-darwin.so, 0x0002): Library not loaded: @rpath/libprotobuf.30.dylib
  Referenced from: <7A1D0729-4282-3861-B440-3706ACE578B2> /Users/[USER_NAME]/opt/anaconda3/envs/ml-test/lib/python3.10/site-packages/google/protobuf/pyext/_message.cpython-310-darwin.so
  Reason: tried: '/Users/[USER_NAME]/opt/anaconda3/envs/ml-test/lib/libprotobuf.30.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/Users/[USER_NAME]/opt/anaconda3/envs/ml-test/lib/libprotobuf.30.dylib' (no such file), '/Users/[USER_NAME]/opt/anaconda3/envs/ml-test/lib/libprotobuf.30.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/Users/[USER_NAME]/opt/anaconda3/envs/ml-test/lib/libprotobuf.30.dylib' (no such file), '/Users/[USER_NAME]/opt/anaconda3/envs/ml-test/lib/python3.10/site-packages/google/protobuf/pyext/../../../../../libprotobuf.30.dylib' (no such file), '/Users/[USER_NAME]/opt/anaconda3/envs/ml-test/lib/libprotobuf.30.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/Users/[USER_NAME]/opt/anaconda3/envs/ml-test/lib/libprotobuf.30.dylib' (no such file), '/Users/[USER_NAME]/opt/anaconda3/envs/ml-test/lib/libprotobuf.30.dylib' (no such file), '/System/Volumes/Preboot/Cryptexes/OS/Users/[USER_NAME]/opt/anaconda3/envs/ml-test/lib/libprotobuf.30.dylib' (no such file), '/Users/[USER_NAME]/opt/anaconda3/envs/ml-test/lib/python3.10/site-packages/google/protobuf/pyext/../../../../../libprotobuf.30.dylib' (no such file), '/Users/[USER_NAME]/opt/anaconda3/envs/ml-test/bin/../lib/libprotobuf.30.dylib' (no such file), '/Users/[USER_NAME]/opt/anaconda3/envs/ml-test/bin/../lib/libprotobuf.30.dylib' (no such file), '/usr/local/lib/libprotobuf.30.dylib' (no such file), '/usr/lib/libprotobuf.30.dylib' (no such file, not in dyld cache)
```
___

### エラー２：UnityObservationException
以下のエラーの場合，理由はよくわからないが，unityのml-agentsパッケージを2.0から3.0へとアップデートしたら動いた。
package managerの，`Add package from git URL`より，
```console
git+https://github.com/Unity-Technologies/ml-agents.git?path=com.unity.ml-agents#release_21
```
を入力すれば，3.0のml-agentsパッケージを取得できる。
```console:エラー２
mlagents_envs.exception.UnityObservationException: Decompressed observation did not have the expected shape - decompressed had (3, 84, 84) but expected [84, 84, 3]
```
参考：https://github.com/Unity-Technologies/ml-agents/issues/6041
___

### エラー３：