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## de.jstacs.classifier.scoringFunctionBased.logPrior
Class SimpleGaussianSumLogPrior

    java.lang.Object
      de.jstacs.algorithms.optimization.DifferentiableFunction
          de.jstacs.classifier.scoringFunctionBased.logPrior.LogPrior
              de.jstacs.classifier.scoringFunctionBased.logPrior.SimpleGaussianSumLogPrior

All Implemented Interfaces:
  Function, Storable

    public class SimpleGaussianSumLogPrior

extends LogPrior

This class implements a prior that is a product of Gaussian distributions with mean 0 and equal variance for each parameter.

Author:
  Jens Keilwagen

Field Summary

Fields inherited from class de.jstacs.classifier.scoringFunctionBased.logPrior.LogPrior
`UNKNOWN`

Constructor Summary
`SimpleGaussianSumLogPrior(double sigma)` Creates a new `SimpleGaussianSumLogPrior` with mean 0 and variance `sigma` for all parameters, including the class parameters.
`SimpleGaussianSumLogPrior(StringBuffer xml)` Recreates a `SimpleGaussianSumLogPrior` from its XML representation as returned by `toXML()`.

Method Summary
`void` | `addGradientFor(double[] params, double[] grad)` Adds the gradient of the log-prior using the current parameters to a given vector.
`double` | `evaluateFunction(double[] params)` Evaluates the function at a certain vector (in mathematical sense) `x`.
`int` | `getDimensionOfScope()` Returns the dimension of the scope of the function.
`String` | `getInstanceName()` Returns a short instance name.
`SimpleGaussianSumLogPrior` | `getNewInstance()` This method returns an empty new instance of the current prior.
`StringBuffer` | `toXML()` Encodes the prior as an XML representation.

Methods inherited from class de.jstacs.classifier.scoringFunctionBased.logPrior.LogPrior
`evaluateGradientOfFunction, set`

Methods inherited from class de.jstacs.algorithms.optimization.DifferentiableFunction
`findOneDimensionalMin`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### SimpleGaussianSumLogPrior

    public SimpleGaussianSumLogPrior(double sigma)

  Creates a new `SimpleGaussianSumLogPrior` with mean 0 and variance `sigma` for all parameters, including the class parameters.

  Parameters:
    `sigma` - the variance

### SimpleGaussianSumLogPrior

    public SimpleGaussianSumLogPrior(StringBuffer xml)
                              throws NonParsableException

  Recreates a `SimpleGaussianSumLogPrior` from its XML representation as returned by `toXML()`.

  Parameters:
    `xml` - the XML representation
  Throws:
    `NonParsableException` - is thrown if the XML code could not be parsed

Method Detail

### addGradientFor

    public void addGradientFor(double[] params,
                               double[] grad)

  Description copied from class: `LogPrior`
  Adds the gradient of the log-prior using the current parameters to a given vector.

  Specified by:
    `addGradientFor` in class `LogPrior`
  Parameters:
    `params` - the parameters
    `grad` - the vector

### evaluateFunction

    public double evaluateFunction(double[] params)

  Description copied from interface: `Function`
  Evaluates the function at a certain vector (in mathematical sense) `x`.

  Parameters:
    `params` - the current vector
  Returns:
    the evaluation of the function

### getDimensionOfScope

    public int getDimensionOfScope()

  Description copied from interface: `Function`
  Returns the dimension of the scope of the function.

  Returns:
    dimension of the scope; n, with f: R^n -> R

### getNewInstance

    public SimpleGaussianSumLogPrior getNewInstance()
                                             throws CloneNotSupportedException

  Description copied from class: `LogPrior`
  This method returns an empty new instance of the current prior. The method works similar to clone, but does not clone `ScoringFunction` s that may be inside the instance. The `ScoringFunction`s must be set by an invocation of the method `LogPrior.set(boolean, ScoringFunction...)`.

  Specified by:
    `getNewInstance` in class `LogPrior`
  Returns:
    a new empty instance of the prior
  Throws:
    `CloneNotSupportedException` - if something went wrong while cloning
  See Also:
    `LogPrior.set(boolean, ScoringFunction...)`

### toXML

    public StringBuffer toXML()

  Description copied from class: `LogPrior`
  Encodes the prior as an XML representation. It does not encode all information, since the method ``LogPrior.set(boolean, ScoringFunction...)` has to be invoked after decoding.

  `
  Specified by:
    `toXML` in interface `Storable`
  Specified by:
    `toXML` in class `LogPrior`
  Returns:
    the XML representation;

### getInstanceName

    public String getInstanceName()

  Description copied from class: `LogPrior`
  Returns a short instance name.

  Specified by:
    `getInstanceName` in class `LogPrior`
  Returns:
    a short instance name

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