| Interface | Description | 
|---|---|
| DistanceMetric | 
 An interface for defining the distance between two states that are represented with double arrays. 
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| Class | Description | 
|---|---|
| RBF | 
 A class for defining radial basis functions for states represented with a double array. 
 | 
| RBFFeatures | 
 A feature database of RBF units that can be used for linear value function approximation. 
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