安装说明

1. Windows的Mujoco

RFC需要Mujoco-py，安装系统是Windows，因此必须规定Mujoco-py的版本为1.50.1.68。

Windows support has been DEPRECATED and removed in 2.0.2.0. One known good past version is 1.50.1.68.

于是切到该版本进行安装，不出所料安装失败，报错信息如下：

error: could not create 'C:\Users\~\AppData\Local\Temp\pip-install-7xdw75gb\mujoco-py_aa94b50ebfb9499ea7d999af51e6c105\mujoco_py\generated\_pyxbld_1.50.1.68_37_windowsextensionbuilder\temp.win-amd64-3.7\Release\Users\~\AppData\Local\Temp\pip-install-7xdw75gb\mujoco-py_aa94b50ebfb9499ea7d999af51e6c105': The system cannot find the path specified
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
error: legacy-install-failure

× Encountered error while trying to install package.
╰─> mujoco-py
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这里是该错误的解决办法：https://github.com/openai/mujoco-py/issues/253#issuecomment-446025520，照着这个来就可以安装了。

1.1 Mujoco-py是啥

我猜Mujoco-py是Mujoco早期版本的python wrapper，也是早期版本的分发、版权控制，不过现在Mujoco已经免费了，所以直接pip install mujoco就行了，不必再去找激活码了。

1.2 额外

[1] Mujoco早期版本激活码：http://www.roboti.us/license.html
[2] Mujoco 150 版本下载链接：http://www.roboti.us/download.html