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Reinforcement Learning using Tensor Flow

For all of you smarty pants, who discovered the "continuous" branch of my repo: it is not yet functional, I never got it to coverge and it probably has a software bug. If you want to play around with it you are welcome, but be prepared to do some serious debugging. If you do get it to work though, definitely let me know! ;-) I'll probably get back to fixing it some time in February / March.

Quick start

Check out Karpathy game in notebooks folder.

The image above depicts a strategy learned by the DeepQ controller. Available actions are accelerating top, bottom, left or right. The reward signal is +1 for the green fellas, -1 for red and -5 for orange.

Requirements

  • future==0.15.2
  • euclid==0.1
  • inkscape (for animation gif creation)

How does this all fit together.

tf_rl has controllers and simulators which can be pieced together using simulate function.

Using human controller.

Want to have some fun controlling the simulation by yourself? You got it! Use tf_rl.controller.HumanController in your simulation.

To issue commands run in terminal

python3 tf_rl/controller/human_controller.py

For it to work you also need to have a redis server running locally.

Writing your own controller

To write your own controller define a controller class with 3 functions:

  • action(self, observation) given an observation (usually a tensor of numbers) representing an observation returns action to perform.
  • store(self, observation, action, reward, newobservation) called each time a transition is observed from observation to newobservation. Transition is a consequence of action and has associated reward
  • training_step(self) if your controller requires training that is the place to do it, should not take to long, because it will be called roughly every action execution.

Writing your own simulation

To write your own simulation define a simulation class with 4 functions:

  • observe(self) returns a current observation
  • collect_reward(self) returns the reward accumulated since the last time function was called.
  • perform_action(self, action) updates internal state to reflect the fact that aciton was executed
  • step(self, dt) update internal state as if dt of simulation time has passed.
  • to_html(self, info=[]) generate an html visualization of the game. info can be optionally passed an has a list of strings that should be displayed along with the visualization

Creating GIFs based on simulation

The simulate method accepts save_path argument which is a folder where all the consecutive images will be stored. To make them into a GIF use scripts/make_gif.sh PATH where path is the same as the path you passed to save_path argument