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## de.jstacs.scoringFunctions.mix
Class AbstractMixtureScoringFunction

    java.lang.Object
      de.jstacs.scoringFunctions.AbstractNormalizableScoringFunction
          de.jstacs.scoringFunctions.mix.AbstractMixtureScoringFunction

All Implemented Interfaces:
  NormalizableScoringFunction, ScoringFunction, Storable, Cloneable

Direct Known Subclasses:
  HiddenMotifsMixture, MixtureScoringFunction, StrandScoringFunction

    public abstract class AbstractMixtureScoringFunction

extends AbstractNormalizableScoringFunction

This main abstract class for any mixture scoring function (e.g. "real" mixture, strand mixture, hidden motif mixture, ...). The potential for the hidden variables is parameterized depending on the parameterization of the given `NormalizableScoringFunction`s. If these are already normalized (see `NormalizableScoringFunction.isNormalized()` ) the potential is parameterized using the Meila-parameterization, otherwise it is parameterized using the unnormalized MRF(Markov Random Fields)-parameterization.

Author:
  Jens Keilwagen

Field Summary
`protected double[]` | `componentScore` This array is used while computing the score.
`protected DoubleList[]` | `dList` This array contains some `DoubleList`s that are used while computing the partial derivation.
`protected boolean` | `freeParams` This `boolean` indicates whether free parameterization or all parameters are used.
`protected NormalizableScoringFunction[]` | `function` This array contains the internal `ScoringFunction`s that are used to determine the score.
`protected double[]` | `hiddenParameter` This array contains the hidden parameters of the instance.
`protected double[]` | `hiddenPotential` This array contains the hidden potentials of the instance.
`protected IntList[]` | `iList` This array contains some `IntList`s that are used while computing the partial derivation.
`protected double` | `logGammaSum` This `double` contains the sum of the logarithm of the gamma functions used in the prior.
`protected double` | `logHiddenNorm` This `double` contains the logarithm of the normalization constant of hidden parameters of the instance.
`protected double[]` | `logHiddenPotential` This array contains the logarithm of the hidden potentials of the instance.
`protected double` | `norm` This `double` contains the normalization constant of the instance.
`protected boolean` | `optimizeHidden` This `boolean` indicates whether to optimize the hidden variables of this instance.
`protected int[]` | `paramRef` This array contains the references/indices for the parameters.
`protected double[]` | `partNorm` This array contains the partial normalization constants, i.e. the normalization constant for each component.

Fields inherited from class de.jstacs.scoringFunctions.AbstractNormalizableScoringFunction
`alphabets, length, r`

Fields inherited from interface de.jstacs.scoringFunctions.ScoringFunction
`UNKNOWN`

Constructor Summary
`protected` | `AbstractMixtureScoringFunction(int length, int starts, int dimension, boolean optimizeHidden, boolean plugIn, NormalizableScoringFunction... function)` This constructor creates a new `AbstractMixtureScoringFunction`.
`protected` | `AbstractMixtureScoringFunction(StringBuffer xml)` This is the constructor for the interface `Storable`.

Method Summary
`void` | `addGradientOfLogPriorTerm(double[] grad, int start)` This method computes the gradient of `NormalizableScoringFunction.getLogPriorTerm()` for each parameter of this model.
`AbstractMixtureScoringFunction` | `clone()` Creates a clone (deep copy) of the current `ScoringFunction` instance.
`protected void` | `cloneFunctions(NormalizableScoringFunction[] originalFunctions)` This method clones the given array of functions and enables the user to do some post-processing.
`protected void` | `computeHiddenParameter(double[] statistic)` This method has to be invoked during an initialization.
`protected void` | `computeLogGammaSum()` This method is used to pre-compute the sum of the logarithm of the gamma functions that is used in the prior.
`protected boolean` | `determineIsNormalized()` This method is used to determine the value that is returned by the method `isNormalized()`.
`protected void` | `extractFurtherInformation(StringBuffer xml)` This method is the opposite of `getFurtherInformation()`.
`protected abstract void` | `fillComponentScores(Sequence seq, int start)` Fills the internal array `componentScore` with the logarithmic scores of the components given a `Sequence`.
`protected void` | `fromXML(StringBuffer b)` This method is called in the constructor for the `Storable` interface to create a scoring function from a `StringBuffer`.
`double[]` | `getCurrentParameterValues()` Returns a `double` array of dimension `ScoringFunction.getNumberOfParameters()` containing the current parameter values.
`NormalizableScoringFunction` | `getFunction(int index)` This method returns a specific internal function.
`NormalizableScoringFunction[]` | `getFunctions()` This method returns an array of clones of the internal used functions.
`protected StringBuffer` | `getFurtherInformation()` This method is used to append further information of the instance to the XML representation.
`abstract double` | `getHyperparameterForHiddenParameter(int index)` This method returns the hyperparameter for the hidden parameter with index `index`.
`int` | `getIndexOfMaximalComponentFor(Sequence seq, int start)` Returns the index of the component that has the greatest impact on the complete score for a `Sequence`.
`protected int[]` | `getIndices(int index)` This array is used to compute the relative indices of a parameter index.
`double` | `getLogNormalizationConstant()` Returns the logarithm of the sum of the scores over all sequences of the event space.
`protected abstract double` | `getLogNormalizationConstantForComponent(int i)` Computes the logarithm of the normalization constant for the component `i`.
`double` | `getLogPriorTerm()` This method computes a value that is proportional to ``NormalizableScoringFunction.getEss()` * `NormalizableScoringFunction.getLogNormalizationConstant()` + Math.log( prior )` where `prior` is the prior for the parameters of this model.
`double` | `getLogScore(Sequence seq, int start)` Returns the logarithmic score for the `Sequence` `seq` beginning at position `start` in the `Sequence`.
`protected static int` | `getMaxIndex(double[] w)` Returns the index with maximal value in a `double` array.
`int` | `getNumberOfComponents()` Returns the number of different components of this `AbstractMixtureScoringFunction`.
`int` | `getNumberOfParameters()` Returns the number of parameters in this `ScoringFunction`.
`int` | `getNumberOfRecommendedStarts()` This method returns the number of recommended optimization starts.
`double[]` | `getProbsForComponent(Sequence seq)` Returns the probabilities for each component given a `Sequence`.
`NormalizableScoringFunction[]` | `getScoringFunctions()` Returns a deep copy of all internal used `ScoringFunction`s.
`int` | `getSizeOfEventSpaceForRandomVariablesOfParameter(int index)` Returns the size of the event space of the random variables that are affected by parameter no.
`protected String` | `getXMLTag()` This method returns the XML tag of the instance that is used to build a XML representation.
`protected void` | `init(boolean freeParams)` This method creates the underlying structure for the parameters.
`void` | `initializeFunction(int index, boolean freeParams, Sample[] data, double[][] weights)` This method creates the underlying structure of the `ScoringFunction`.
`void` | `initializeFunctionRandomly(boolean freeParams)` This method initializes the `ScoringFunction` randomly.
`protected void` | `initializeHiddenPotentialRandomly()` This method initializes the hidden potential (and the corresponding parameters) randomly.
`void` | `initializeHiddenUniformly()` This method initializes the hidden parameters of the instance uniformly.
`protected abstract void` | `initializeUsingPlugIn(int index, boolean freeParams, Sample[] data, double[][] weights)` This method initializes the functions using the data in some way.
`protected void` | `initWithLength(boolean freeParams, int len)` This method is used to create the underlying structure, e.g.
`boolean` | `isInitialized()` This method can be used to determine whether the model is initialized.
`boolean` | `isNormalized()` This method indicates whether the implemented score is already normalized to 1 or not.
`protected void` | `precomputeNorm()` Pre-computes the normalization constant.
`protected void` | `setHiddenParameters(double[] params, int start)` This method sets the hidden parameters of the model.
`void` | `setParameters(double[] params, int start)` This method sets the internal parameters to the values of `params` between `start` and `start + `ScoringFunction.getNumberOfParameters()` - 1`
`protected void` | `setParametersForFunction(int index, double[] params, int start)` This method allows to set the parameters for specific functions.
`StringBuffer` | `toXML()` This method returns an XML representation as `StringBuffer` of an instance of the implementing class.

Methods inherited from class de.jstacs.scoringFunctions.AbstractNormalizableScoringFunction
`getAlphabetContainer, getInitialClassParam, getLength, getLogScore, getLogScoreAndPartialDerivation, getNumberOfStarts, isNormalized`

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

Methods inherited from interface de.jstacs.scoringFunctions.NormalizableScoringFunction
`getEss, getLogPartialNormalizationConstant`

Methods inherited from interface de.jstacs.scoringFunctions.ScoringFunction
`getInstanceName, getLogScoreAndPartialDerivation`

Field Detail

### paramRef

    protected int[] paramRef

  This array contains the references/indices for the parameters. Only the start index for each new function is stored.

### optimizeHidden

    protected boolean optimizeHidden

  This `boolean` indicates whether to optimize the hidden variables of this instance. (It is not used recursive.)

### freeParams

    protected boolean freeParams

  This `boolean` indicates whether free parameterization or all parameters are used.

### function

    protected NormalizableScoringFunction[] function

  This array contains the internal `ScoringFunction`s that are used to determine the score.

### hiddenParameter

    protected double[] hiddenParameter

  This array contains the hidden parameters of the instance.

### logHiddenPotential

    protected double[] logHiddenPotential

  This array contains the logarithm of the hidden potentials of the instance.

### hiddenPotential

    protected double[] hiddenPotential

  This array contains the hidden potentials of the instance.

### componentScore

    protected double[] componentScore

  This array is used while computing the score. It stores the scores of the components and is used to avoid creating a new array every time.

### partNorm

    protected double[] partNorm

  This array contains the partial normalization constants, i.e. the normalization constant for each component.

### norm

    protected double norm

  This `double` contains the normalization constant of the instance.

### logHiddenNorm

    protected double logHiddenNorm

  This `double` contains the logarithm of the normalization constant of hidden parameters of the instance.

### logGammaSum

    protected double logGammaSum

  This `double` contains the sum of the logarithm of the gamma functions used in the prior.

  See Also:
    `computeLogGammaSum()`

### dList

    protected DoubleList[] dList

  This array contains some `DoubleList`s that are used while computing the partial derivation.

### iList

    protected IntList[] iList

  This array contains some `IntList`s that are used while computing the partial derivation.

Constructor Detail

### AbstractMixtureScoringFunction

    protected AbstractMixtureScoringFunction(int length,
                                             int starts,
                                             int dimension,
                                             boolean optimizeHidden,
                                             boolean plugIn,
                                             NormalizableScoringFunction... function)
                                      throws CloneNotSupportedException

  This constructor creates a new `AbstractMixtureScoringFunction`.

  Parameters:
    `length` - the sequence length that should be modeled
    `starts` - the number of starts that should be done in an optimization
    `dimension` - the number of different mixture components
    `optimizeHidden` - indicates whether the parameters for the hidden variables should be optimized or not
    `plugIn` - indicates whether the initial parameters for an optimization should be related to the data or randomly drawn
    `function` - the `ScoringFunction`s
  Throws:
    `CloneNotSupportedException` - if an element of `function` could not be cloned

### AbstractMixtureScoringFunction

    protected AbstractMixtureScoringFunction(StringBuffer xml)
                                      throws NonParsableException

  This is the constructor for the interface `Storable`. Creates a new `AbstractMixtureScoringFunction` out of a `StringBuffer` as returned by `toXML()`.

  Parameters:
    `xml` - the XML representation as `StringBuffer`
  Throws:
    `NonParsableException` - if the representation could not be parsed

Method Detail

### getMaxIndex

    protected static final int getMaxIndex(double[] w)

  Returns the index with maximal value in a `double` array.

  Parameters:
    `w` - the given `double` array
  Returns:
    the index

### computeLogGammaSum

    protected void computeLogGammaSum()

  This method is used to pre-compute the sum of the logarithm of the gamma functions that is used in the prior.

### clone

    public AbstractMixtureScoringFunction clone()
                                         throws CloneNotSupportedException

  Description copied from interface: `ScoringFunction`
  Creates a clone (deep copy) of the current `ScoringFunction` instance.

  Specified by:
    `clone` in interface `ScoringFunction`
  Overrides:
    `clone` in class `AbstractNormalizableScoringFunction`
  Returns:
    the cloned instance of the current `ScoringFunction`
  Throws:
    `CloneNotSupportedException` - if something went wrong while cloning the `ScoringFunction`

### cloneFunctions

    protected void cloneFunctions(NormalizableScoringFunction[] originalFunctions)
                           throws CloneNotSupportedException

  This method clones the given array of functions and enables the user to do some post-processing. This method is only used in `clone()`.

  Parameters:
    `originalFunctions` - the array of functions to be cloned
  Throws:
    `CloneNotSupportedException` - if an element of `originalFunctions` could not be cloned

### getHyperparameterForHiddenParameter

    public abstract double getHyperparameterForHiddenParameter(int index)

  This method returns the hyperparameter for the hidden parameter with index `index`.

  Parameters:
    `index` - the index of the hidden parameter
  Returns:
    the hyperparameter for the hidden parameter

### getLogPriorTerm

    public double getLogPriorTerm()

  Description copied from interface: `NormalizableScoringFunction`
  This method computes a value that is proportional to

  ``NormalizableScoringFunction.getEss()` * `NormalizableScoringFunction.getLogNormalizationConstant()` + Math.log( prior )`

  where `prior` is the prior for the parameters of this model.

  Returns:
    a value that is proportional to ``NormalizableScoringFunction.getEss()` * `NormalizableScoringFunction.getLogNormalizationConstant()` + Math.log( prior ).`
  See Also:
    `NormalizableScoringFunction.getEss()`, `NormalizableScoringFunction.getLogNormalizationConstant()`

### addGradientOfLogPriorTerm

    public void addGradientOfLogPriorTerm(double[] grad,
                                          int start)
                                   throws Exception

  Description copied from interface: `NormalizableScoringFunction`
  This method computes the gradient of `NormalizableScoringFunction.getLogPriorTerm()` for each parameter of this model. The results are added to the array `grad` beginning at index `start`.

  Parameters:
    `grad` - the array of gradients
    `start` - the start index in the `grad` array, where the partial derivations for the parameters of this models shall be entered
  Throws:
    `Exception` - if something went wrong with the computing of the gradients
  See Also:
    `NormalizableScoringFunction.getLogPriorTerm()`

### getIndexOfMaximalComponentFor

    public int getIndexOfMaximalComponentFor(Sequence seq,
                                             int start)

  Returns the index of the component that has the greatest impact on the complete score for a `Sequence`.

  Parameters:
    `seq` - the sequence
    `start` - the start position
  Returns:
    the index of the component

### getCurrentParameterValues

    public double[] getCurrentParameterValues()
                                       throws Exception

  Description copied from interface: `ScoringFunction`
  Returns a `double` array of dimension `ScoringFunction.getNumberOfParameters()` containing the current parameter values. If one likes to use these parameters to start an optimization it is highly recommended to invoke `ScoringFunction.initializeFunction(int, boolean, Sample[], double[][])` before. After an optimization this method can be used to get the current parameter values.

  Returns:
    the current parameter values
  Throws:
    `Exception` - if no parameters exist (yet)

### getLogScore

    public double getLogScore(Sequence seq,
                              int start)

  Description copied from interface: `ScoringFunction`
  Returns the logarithmic score for the `Sequence` `seq` beginning at position `start` in the `Sequence`.

  Parameters:
    `seq` - the `Sequence`
    `start` - the start position in the `Sequence`
  Returns:
    the logarithmic score for the `Sequence`

### getLogNormalizationConstant

    public final double getLogNormalizationConstant()

  Description copied from interface: `NormalizableScoringFunction`
  Returns the logarithm of the sum of the scores over all sequences of the event space.

  Returns:
    the logarithm of the normalization constant Z

### getNumberOfComponents

    public final int getNumberOfComponents()

  Returns the number of different components of this `AbstractMixtureScoringFunction`.

  Returns:
    the number of different components

### getNumberOfParameters

    public final int getNumberOfParameters()

  Description copied from interface: `ScoringFunction`
  Returns the number of parameters in this `ScoringFunction`. If the number of parameters is not known yet, the method returns `ScoringFunction.UNKNOWN`.

  Returns:
    the number of parameters in this `ScoringFunction`
  See Also:
    `ScoringFunction.UNKNOWN`

### getNumberOfRecommendedStarts

    public final int getNumberOfRecommendedStarts()

  Description copied from interface: `ScoringFunction`
  This method returns the number of recommended optimization starts. The standard implementation returns 1.

  Specified by:
    `getNumberOfRecommendedStarts` in interface `ScoringFunction`
  Overrides:
    `getNumberOfRecommendedStarts` in class `AbstractNormalizableScoringFunction`
  Returns:
    the number of recommended optimization starts

### getProbsForComponent

    public double[] getProbsForComponent(Sequence seq)

  Returns the probabilities for each component given a `Sequence`.

  Parameters:
    `seq` - the `Sequence`
  Returns:
    an array containing the probability of component `i` (`=p(i|class,seq)`) in entry `i`

### getScoringFunctions

    public NormalizableScoringFunction[] getScoringFunctions()
                                                      throws CloneNotSupportedException

  Returns a deep copy of all internal used `ScoringFunction`s.

  Returns:
    a deep copy of all internal used `ScoringFunction`s
  Throws:
    `CloneNotSupportedException` - if one element of the internal used `ScoringFunction`s could not be cloned

### getSizeOfEventSpaceForRandomVariablesOfParameter

    public int getSizeOfEventSpaceForRandomVariablesOfParameter(int index)

  Description copied from interface: `NormalizableScoringFunction`
  Returns the size of the event space of the random variables that are affected by parameter no. `index`, i.e. the product of the sizes of the alphabets at the position of each random variable affected by parameter `index`. For DNA alphabets this corresponds to 4 for a PWM, 16 for a WAM except position 0, ...

  Parameters:
    `index` - the index of the parameter
  Returns:
    the size of the event space

### initializeFunction

    public void initializeFunction(int index,
                                   boolean freeParams,
                                   Sample[] data,
                                   double[][] weights)
                            throws Exception

  Description copied from interface: `ScoringFunction`
  This method creates the underlying structure of the `ScoringFunction`.

  Parameters:
    `index` - the index of the class the `ScoringFunction` models
    `freeParams` - indicates whether the (reduced) parameterization is used
    `data` - the samples
    `weights` - the weights of the sequences in the samples
  Throws:
    `Exception` - if something went wrong

### initializeUsingPlugIn

    protected abstract void initializeUsingPlugIn(int index,
                                                  boolean freeParams,
                                                  Sample[] data,
                                                  double[][] weights)
                                           throws Exception

  This method initializes the functions using the data in some way.

  Parameters:
    `index` - the class index
    `freeParams` - if `true`, the (reduced) parameterization is used``
    `data` - the data
    `weights` - the weights for the data
  Throws:
    `Exception` - if the initialization could not be done
  See Also:
    `ScoringFunction.initializeFunction(int, boolean, Sample[], double[][])`

### initializeFunctionRandomly

    public void initializeFunctionRandomly(boolean freeParams)
                                    throws Exception

  Description copied from interface: `ScoringFunction`
  This method initializes the `ScoringFunction` randomly. It has to create the underlying structure of the `ScoringFunction`.

  Parameters:
    `freeParams` - indicates whether the (reduced) parameterization is used
  Throws:
    `Exception` - if something went wrong

### initializeHiddenPotentialRandomly

    protected void initializeHiddenPotentialRandomly()

  This method initializes the hidden potential (and the corresponding parameters) randomly.

### isInitialized

    public boolean isInitialized()

  Description copied from interface: `ScoringFunction`
  This method can be used to determine whether the model is initialized. If the model is not initialized you should invoke the method `ScoringFunction.initializeFunction(int, boolean, Sample[], double[][])`.

  Returns:
    `true` if the model is initialized, `false` otherwise

### setParameters

    public void setParameters(double[] params,
                              int start)

  Description copied from interface: `ScoringFunction`
  This method sets the internal parameters to the values of `params` between `start` and `start + `ScoringFunction.getNumberOfParameters()` - 1`

  Parameters:
    `params` - the new parameters
    `start` - the start index in `params`

### determineIsNormalized

    protected boolean determineIsNormalized()

  This method is used to determine the value that is returned by the method `isNormalized()`.

  Returns:
    the value that is set to an internal variable and that will be returned by `isNormalized()`

### initializeHiddenUniformly

    public void initializeHiddenUniformly()

  This method initializes the hidden parameters of the instance uniformly.

### setHiddenParameters

    protected void setHiddenParameters(double[] params,
                                       int start)

  This method sets the hidden parameters of the model.

  Parameters:
    `params` - the parameter vector
    `start` - the start index in `params`

### setParametersForFunction

    protected void setParametersForFunction(int index,
                                            double[] params,
                                            int start)

  This method allows to set the parameters for specific functions.

  Parameters:
    `index` - the function index
    `params` - the parameter vector
    `start` - the start index in `params`

### toXML

    public final StringBuffer toXML()

  Description copied from interface: `Storable`
  This method returns an XML representation as `StringBuffer` of an instance of the implementing class.

  Returns:
    the XML representation

### fromXML

    protected final void fromXML(StringBuffer b)
                          throws NonParsableException

  Description copied from class: `AbstractNormalizableScoringFunction`
  This method is called in the constructor for the `Storable` interface to create a scoring function from a `StringBuffer`.

  Specified by:
    `fromXML` in class `AbstractNormalizableScoringFunction`
  Parameters:
    `b` - the XML representation as `StringBuffer`
  Throws:
    `NonParsableException` - if the `StringBuffer` could not be parsed
  See Also:
    `AbstractNormalizableScoringFunction.AbstractNormalizableScoringFunction(StringBuffer)`

### getFurtherInformation

    protected StringBuffer getFurtherInformation()

  This method is used to append further information of the instance to the XML representation. This method is designed to allow subclasses to add information to the XML representation.

  Returns:
    the further information as XML code in a `StringBuffer`
  See Also:
    `extractFurtherInformation(StringBuffer)`

### extractFurtherInformation

    protected void extractFurtherInformation(StringBuffer xml)
                                      throws NonParsableException

  This method is the opposite of `getFurtherInformation()`. It extracts further information of the instance from a XML representation.

  Parameters:
    `xml` - the `StringBuffer` containing the information to be extracted as XML code
  Throws:
    `NonParsableException` - if the `StringBuffer` could not be parsed
  See Also:
    `getFurtherInformation()`

### getIndices

    protected int[] getIndices(int index)

  This array is used to compute the relative indices of a parameter index.

  Parameters:
    `index` - the parameter index
  Returns:
    the relative indices of the parameter index
  See Also:
    `paramRef`

### getXMLTag

    protected String getXMLTag()

  This method returns the XML tag of the instance that is used to build a XML representation.

  Returns:
    the XML tag of the instance
  See Also:
    `Class.getSimpleName()`

### init

    protected void init(boolean freeParams)

  This method creates the underlying structure for the parameters.

  Parameters:
    `freeParams` - indicates whether to use only free parameters or all parameters

### initWithLength

    protected final void initWithLength(boolean freeParams,
                                        int len)

  This method is used to create the underlying structure, e.g. `paramRef`.

  Parameters:
    `freeParams` - indicates whether to use free parameters or all
    `len` - the length of the array `paramRef`

### computeHiddenParameter

    protected void computeHiddenParameter(double[] statistic)

  This method has to be invoked during an initialization.

  Parameters:
    `statistic` - a statistic for the initialization of the hidden parameters
  See Also:
    `ScoringFunction.initializeFunction(int, boolean, Sample[], double[][])`

### precomputeNorm

    protected void precomputeNorm()

  Pre-computes the normalization constant.

### getLogNormalizationConstantForComponent

    protected abstract double getLogNormalizationConstantForComponent(int i)

  Computes the logarithm of the normalization constant for the component `i`.

  Parameters:
    `i` - the index of the component
  Returns:
    the logarithm of the normalization constant of the component

### fillComponentScores

    protected abstract void fillComponentScores(Sequence seq,
                                                int start)

  Fills the internal array `componentScore` with the logarithmic scores of the components given a `Sequence`.

  Parameters:
    `seq` - the sequence
    `start` - the start position in `seq`

### isNormalized

    public final boolean isNormalized()

  Description copied from interface: `NormalizableScoringFunction`
  This method indicates whether the implemented score is already normalized to 1 or not. The standard implementation returns `false`.

  Specified by:
    `isNormalized` in interface `NormalizableScoringFunction`
  Overrides:
    `isNormalized` in class `AbstractNormalizableScoringFunction`
  Returns:
    `true` if the implemented score is already normalized to 1, `false` otherwise

### getFunction

    public NormalizableScoringFunction getFunction(int index)
                                            throws CloneNotSupportedException

  This method returns a specific internal function.

  Parameters:
    `index` - the index of the specific function
  Returns:
    a clone of the specific function
  Throws:
    `CloneNotSupportedException` - if the function could not be cloned

### getFunctions

    public NormalizableScoringFunction[] getFunctions()
                                               throws CloneNotSupportedException

  This method returns an array of clones of the internal used functions.

  Returns:
    an array of clones of the internal used functions
  Throws:
    `CloneNotSupportedException` - if at least one function could not be cloned

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