Anyone who've ever used openai_ros with gym?

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Hello, I'm working with ROS kinetic on Ubuntu 16.04.

I've finished installing Tensorflow and Keras with the Openai_ros package for the DRL frameworks.

But it seems openai_ros needs the appropriate gym module for a learning environment.

I've simply thought that openai_ros package also includes the gym module, but it was not; every time I declare gym like

from gym import spaces

it brought ImportError.

Is it necessary to install gym module once more?

Honesty, I'm afraid I would make some mistake in installing it for some reason; whether it might spoil my work env, so I'm hesitating to install...

If anyone who've ever used openai gym with ROS, would you please give me helpful advice?

Thanks in advance. Thanks in advance.