graphics library

[npxp]

Hi, I was watching the introductory video you made on YouTube. At one point in the video, the existence of a graphics library for viewing games was mentioned, contributed by Daniel hennes, if I'm not mistaken. How can I access it? Is this available on openspiel?

[lanctot]

Hi,

I'm not 100% sure what you mean by graphics library, but if I mentioned Daniel Hennes, then I was likely referring to the nice phase portrait of evolutionary dynamics or to the automated games visualizations, which are:

• here: https://github.com/google-deepmind/open_spiel/tree/master/open_spiel/python/egt (visualization.py), and
• here: https://github.com/google-deepmind/open_spiel/tree/master/open_spiel/python/visualizations.

If you are looking for visualizations of the games themselves, there's a nice external project called SpielViz created by @michalsustr.

[npxp]

I'm referring to this. Thanks for the links, I will study more about them

[lanctot]

Ok the file that generated it was the second link in my response above.

[light188]

Hi, I encountered some difficulties while trying to run SpielViz after installing it. When I tried to run it, I kept receiving an error message: AttributeError: module 'pyspiel' has no attribute 'GameParameter'
Is this caused by a version update of OpenSpiel? If that's the case, which version should I use to adapt to SpielViz?

[GeorgeBreahna]

Had the same problem. Opened an issue for visibility.

[lanctot]

Hi, great thanks, but this is a bug in SpielViz not open_spiel. It needs to be fixed on their end. Can you please open the same bug on the SpielViz page instead? Thanks.

[kvr06-ai]

If you're looking for a way to visualize OpenSpiel game trees, spielviz covers this — it's a lightweight matplotlib-based library.

pip install spielviz

import spielviz
spielviz.quick_render("kuhn_poker", path="kuhn.png")

It renders game trees with player-colored nodes, action labels, information set highlighting, and strategy profile overlays. This is currently an MVP — if it's useful, I'm planning to add normal-form game rendering, compact tree layouts, learning dynamics plots, and interactive HTML export. Feedback welcome: https://github.com/kvr06-ai/spielviz/issues

Repo: https://github.com/kvr06-ai/spielviz

[kvr06-ai]

Interactive demo notebook: