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 DeepQLearning
 =============
 
-A powerful machine learning algorithm utilizing Q-Learning and Neural Networks, implemented using Torch and Lua.
+Written by Blake Milner and Jeff Soldate, with help from Eugenio Culurciello and his lab. Work was
+done as part of a project for BME495, a Computational Neuroscience course at Purdue. The original
+code, written in JavaScript, was developed by Andrej Karpathy, a Ph.D. student at Stanford University.
+
+A powerful machine learning algorithm utilizing Q-Learning and Neural Networks, implemented using Torch
+and Lua.
+
+In many practical engineering scenarios it is often necessary for an algorithm to perform a
+series of decisions in order to accomplish a given task. However, that task itself is not always
+well-defined and the intermediate decisions to accomplish it are often complex and ever-changing.
+Furthermore, information that contributes to accomplishing the task is often not readily available
+until critical intermediate decisions have already been made. Video games are a good example of
+situations in which a series of actions is required in order to accomplish a task. In recent years
+very robust algorithms utilizing these concepts have been developed and applied successfully to retro
+Atari video games: http://arxiv.org/pdf/1312.5602v1.pdf.
+
+Reinforcement learning methods that encourage both exploration and strategizing have been developed in
+order to address this problem. One of these methods, called Q-learning, utilizes a policy in order to
+select an optimal action.
+
+The Q-learning algorithm hinges on utility function called the Q-function. This function
+accepts a state that contains all pertinent information about the playing field along with a possible
+action. The function returns a number that describes the utility of that action. In Q-learning the utility
+of an action is evaluated based on the immediate reward gained from taking that action and the
+possibility of a delayed reward that the action may lead to. For large games with many states and possible
+actions the above approach is very time-consuming and computationally intense. Using a neural network to
+represent the Q-function can solve many of these issues by eliminating the need for enumeration for complete
+exploration of the state space.
+
+An implementation of the method described above (written in JavaScript) exists and is freely available:
+http://cs.stanford.edu/people/karpathy/convnetjs/demo/rldemo.html
+
+However, this package is designed for a browser and used primarily as a learning tool. DeepQLearning is a 
+partial port of the Q-learning component of this package to the Lua scripting language. The Neural Network 
+component is powered by Torch 7, a scientific computing framework used for machine learning. It is the hope 
+of the authors that this package can be used to fuel further scientific inquiry into this topic.
+
+
+Installation and Use
+====================
+
+Requirements:
+
+ * Torch7 (with nnx and optim package) 
+-- A scientific computing framework with wide support for machine learning algorithms. (https://github.com/torch/torch7)
+
+
+Usage:
+
+The DeepQLearning module can be easily included in a Lua scipt using:
+
+```bash
+Brain = require 'deepqlearn'
+```
+
+The brain must then be initialized with the number of expected inputs and outputs:
+
+```bash
+Brain.init(num_inputs, num_outputs)   
+```
+
+An action can be selected from an input state space using:
+
+```bash
+action = Brain.forward(state); 
+```
+
+Learning can be effected from the last state space input to Brian.forward by giving a reward value:
+
+```bash
+Brain.backward(reward); 
+```