Merge pull request #754 from zacg/master

Readme for Spatial Pooler Example

examples/sp/README.md

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+# ![Numenta Logo](http://numenta.org/images/numenta-icon128.png) NuPIC
+
+## Basic Spatial Pooler Example
+
+hello_sp.py contains a simple spatial pooler demonstration written in python.
+
+#### To run
+	python hello_sp.py
+
+
+#### Details
+
+This script provides 3 examples demonstrating the effects of the spatial pooler on the following 3 sets of input values:
+
+1. Displaying the output [SDRs](https://github.com/numenta/nupic/wiki/Sparse-Distributed-Representations) of 3 randomized input values.
+2. Displaying 3 [SDR's](https://github.com/numenta/nupic/wiki/Sparse-Distributed-Representations) generated from the same input value.
+3. Displaying 3 [SDR's](https://github.com/numenta/nupic/wiki/Sparse-Distributed-Representations) generated with slightly different input values, by adding 10% and 20% noise to the original input vector.
+
+The script uses a simple binary vector for input.
+
+After running this example and reading through the output you should have a basic understanding of the relationship between input and output of the spatial pooler.
+
+
+Further reading: [Encoders](https://github.com/numenta/nupic/wiki/Encoders)