Methods
ridge(y, X, ridge)
    Performs ridge regression, according to the Weka code.
    Parameters:
| Name | Type | Description | 
|---|---|---|
y | 
            
            array | corresponds to screen coordinates (either x or y) for each of n click events | 
X | 
            
            Array.<Array.<number>> | corresponds to gray pixel features (120 pixels for both eyes) for each of n clicks | 
ridge | 
            
            array | ridge parameter | 
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