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A simple package to allow users to run Monte Carlo Tree Search on any perfect information domain

Project description


This package provides a simple way of using Monte Carlo Tree Search in any perfect information domain.


With pip: pip install mcts

Without pip: Download the zip/tar.gz file of the latest release, extract it, and run python install

Quick Usage

In order to run MCTS, you must implement a State class which can fully describe the state of the world. It must also implement four methods:

  • getPossibleActions(): Returns an iterable of all actions which can be taken from this state
  • takeAction(action): Returns the state which results from taking action action
  • isTerminal(): Returns whether this state is a terminal state
  • getReward(): Returns the reward for this state. Only needed for terminal states.

You must also choose a hashable representation for an action as used in getPossibleActions and takeAction. Typically this would be a class with a custom __hash__ method, but it could also simply be a tuple or a string.

Once these have been implemented, running MCTS is as simple as initializing your starting state, then running:

from mcts import mcts

mcts = mcts(timeLimit=1000)
bestAction =

See for a simple example.

Slow Usage



Feel free to raise a new issue for any new feature or bug you've spotted. Pull requests are also welcomed if you're interested in directly improving the project.

Project details

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Files for mcts, version 1.0.4
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