PLASTK version 0.1

PLASTK GUI ScreenshotIn a departure from my recent blog themes, I’d like to get back to AI and machine learning today to announce the first development release of PLASTK: The Python Learning Agent Software Toolkit.

From the PLASTK README.txt file:

PLASTK is a Python class library for building and experimenting with learning agents, i.e. software programs that interact in a closed loop with an environment (agents) and that learn. Especially, but not limited to, reinforcement learning agents.
PLASTK has an extensible component architecture for defining the components that make up a software agent system, including agents, and environments, and various components needed to build agents, such as function approximators and vector quantizers.

PLASTK Pendulum DemoPLASTK started life as an ad-hoc collection of algorithms from the reinforcement learning and self-organization literature that I implemented for my dissertation experiments. While in grad school I managed to clean it up to the point where a couple of other students were able to use it. The current release is the first step in my effort to make it usable outside a close circle of labmates.

PLASTK currently contains implementations of Q-learning and Sarsa agents tabular state and linear feature representations, self-organizing (Kohonen) maps, growing neural gas, linear, affine, and locally weighted regression. It also contains some demo environments including a two dimensional “gridworld” (shown in the figure), and a pendulum. Included examples show how to set up agents to learn in the gridworld and pendulum environments. PLASTK also includes a simple, component-based GUI, shown in the screenshot on the right, for visualizing agent/environment interaction.

PLASTK’s biggest deficit right now is that the agent/environment interaction API is the long-deprecated RLI version 5, from Rich Suttons RLAI group. One of the first to-do-list items is to update the interface to the new RL-Glue standard.

The PLASTK code is redistributable under GPL v.2, and available for download on Please feel free to contribute! Patches are welcome.


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