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## de.jstacs.models
Interface Model

All Superinterfaces:
  Cloneable, Storable

All Known Implementing Classes:
  AbstractMixtureModel, AbstractModel, BayesianNetworkModel, CompositeModel, DAGModel, DiscreteGraphicalModel, FSDAGModel, FSDAGModelForGibbsSampling, HiddenMotifMixture, HomogeneousMM, HomogeneousModel, InhomogeneousDGM, MixtureModel, NormalizableScoringFunctionModel, SharedStructureMixture, SingleHiddenMotifMixture, StrandModel, UniformModel, VariableLengthWrapperModel

    public interface Model

extends Cloneable, Storable

This interface defines all methods for a probabilistic model.

Author:
  Andre Gohr, Jan Grau, Jens Keilwagen

Method Summary
`Model` | `clone()` Creates a clone (deep copy) of the current `Model` instance.
`Sample` | `emitSample(int numberOfSequences, int... seqLength)` This method returns a `Sample` object containing artificial sequence(s).
`AlphabetContainer` | `getAlphabetContainer()` Returns the container of alphabets that were used when constructing the model.
`ResultSet` | `getCharacteristics()` Returns some information characterizing or describing the current instance of the model.
`String` | `getInstanceName()` Should return a short instance name such as iMM(0), BN(2), ...
`int` | `getLength()` Returns the length of sequences this model can classify.
`double` | `getLogPriorTerm()` Returns a value that is proportional to the log of the prior.
`double[]` | `getLogProbFor(Sample data)` This method computes the logarithm of the probabilities of all sequences in the given sample.
`void` | `getLogProbFor(Sample data, double[] res)` This method computes and stores the logarithm of the probabilities for any sequence in the sample in the given `double`-array.
`double` | `getLogProbFor(Sequence sequence)` Returns the logarithm of the probability of the given sequence given the model.
`double` | `getLogProbFor(Sequence sequence, int startpos)` Returns the logarithm of the probability of (a part of) the given sequence given the model.
`double` | `getLogProbFor(Sequence sequence, int startpos, int endpos)` Returns the logarithm of the probability of (a part of) the given sequence given the model.
`byte` | `getMaximalMarkovOrder()` This method returns the maximal used Markov order, if possible.
`NumericalResultSet` | `getNumericalCharacteristics()` Returns the subset of numerical values that are also returned by `getCharacteristics()`.
`double` | `getPriorTerm()` Returns a value that is proportional to the prior.
`double` | `getProbFor(Sequence sequence)` Returns the probability of the given sequence given the model.
`double` | `getProbFor(Sequence sequence, int startpos)` Returns the probability of (a part of) the given sequence given the model.
`double` | `getProbFor(Sequence sequence, int startpos, int endpos)` Returns the probability of (a part of) the given sequence given the model.
`boolean` | `isTrained()` Returns `true` if the model has been trained successfully, `false` otherwise.
`boolean` | `setNewAlphabetContainerInstance(AlphabetContainer abc)` This method tries to set a new instance of an `AlphabetContainer` for the current model.
`String` | `toString()` Should give a simple representation (text) of the model as `String` .
`void` | `train(Sample data)` Trains the `Model` object given the data as `Sample`.
`void` | `train(Sample data, double[] weights)` Trains the `Model` object given the data as `Sample` using the specified weights.

Methods inherited from interface de.jstacs.Storable
`toXML`

Method Detail

### clone

    Model clone()
                throws CloneNotSupportedException

  Creates a clone (deep copy) of the current `Model` instance.

  Returns:
    the cloned instance
  Throws:
    `CloneNotSupportedException` - if something went wrong while cloning

### train

    void train(Sample data)
               throws Exception

  Trains the `Model` object given the data as `Sample`.
  This method should work non-incrementally. That means the result of the following series: `train(data1)`; `train(data2)` should be a fully trained model over `data2` and not over `data1+data2`. All parameters of the model were given by the call of the constructor.

  Parameters:
    `data` - the given sequences as `Sample`
  Throws:
    `Exception` - if the training did not succeed
  See Also:
    `Sample.getElementAt(int)`, `Sample.ElementEnumerator`

### train

    void train(Sample data,
               double[] weights)
               throws Exception

  Trains the `Model` object given the data as `Sample` using the specified weights. The weight at position i belongs to the element at position i. So the array `weight` should have the number of sequences in the sample as dimension. (Optionally it is possible to use `weight == null` if all weights have the value one.)
  This method should work non-incrementally. That means the result of the following series: `train(data1)`; `train(data2)` should be a fully trained model over `data2` and not over `data1+data2`. All parameters of the model were given by the call of the constructor.

  Parameters:
    `data` - the given sequences as `Sample`
    `weights` - the weights of the elements, each weight should be non-negative
  Throws:
    `Exception` - if the training did not succeed (e.g. the dimension of `weights` and the number of sequences in the sample do not match)
  See Also:
    `Sample.getElementAt(int)`, `Sample.ElementEnumerator`

### getProbFor

    double getProbFor(Sequence sequence)
                      throws NotTrainedException,
                             Exception

  Returns the probability of the given sequence given the model. If at least one random variable is continuous the value of the density function is returned.
  The `length` and the `alphabets` define the type of data that can be modeled and therefore both has to be checked.

  Parameters:
    `sequence` - the given sequence for which the probability/the value of the density function should be returned
  Returns:
    the probability or the value of the density function of the given sequence given the model
  Throws:
    `Exception` - if the sequence could not be handled by the model
    `NotTrainedException` - if the model is not trained yet

### getProbFor

    double getProbFor(Sequence sequence,
                      int startpos)
                      throws NotTrainedException,
                             Exception

  Returns the probability of (a part of) the given sequence given the model. If at least one random variable is continuous the value of density function is returned.
  If the length of the sequences, whose probability should be returned, is fixed (e.g. in a inhomogeneous model) and the given sequence is longer than their fixed length, the start position within the given sequence is given by `startpos`. E.g. the fixed length is 12. The length of the given sequence is 30 and the `startpos`=15 the probability of the part from position 15 to 26 (inclusive) given the model should be returned.
  The `length` and the `alphabets` define the type of data that can be modeled and therefore both has to be checked.

  Parameters:
    `sequence` - the given sequence
    `startpos` - the start position within the given sequence
  Returns:
    the probability or the value of the density function of (the part of) the given sequence given the model
  Throws:
    `Exception` - if the sequence could not be handled by the model
    `NotTrainedException` - if the model is not trained yet

### getProbFor

    double getProbFor(Sequence sequence,
                      int startpos,
                      int endpos)
                      throws NotTrainedException,
                             Exception

  Returns the probability of (a part of) the given sequence given the model. If at least one random variable is continuous the value of density function is returned.
  It extends the possibility given by the method `getProbFor(Sequence, int)` by the fact, that the model could be e.g. homogeneous and therefore the length of the sequences, whose probability should be returned, is not fixed. Additionally the end position of the part of the given sequence is given and the probability of the part from position `startpos` to `endpos` (inclusive) should be returned.
  The `length` and the `alphabets` define the type of data that can be modeled and therefore both has to be checked.

  Parameters:
    `sequence` - the given sequence
    `startpos` - the start position within the given sequence
    `endpos` - the last position to be taken into account
  Returns:
    the probability or the value of the density function of (the part of) the given sequence given the model
  Throws:
    `Exception` - if the sequence could not be handled (e.g. `startpos > endpos`, `endpos > sequence.length`, ...) by the model
    `NotTrainedException` - if the model is not trained yet

### getLogProbFor

    double getLogProbFor(Sequence sequence,
                         int startpos,
                         int endpos)
                         throws Exception

  Returns the logarithm of the probability of (a part of) the given sequence given the model. If at least one random variable is continuous the value of density function is returned.
  For more details see `getProbFor(Sequence, int, int)`

  Parameters:
    `sequence` - the given sequence
    `startpos` - the start position within the given sequence
    `endpos` - the last position to be taken into account
  Returns:
    the logarithm of the probability or the value of the density function of (the part of) the given sequence given the model
  Throws:
    `Exception` - if the sequence could not be handled (e.g. `startpos >` , `endpos > sequence.length`, ...) by the model
    `NotTrainedException` - if the model is not trained yet
  See Also:
    `getProbFor(Sequence, int, int)`

### getLogProbFor

    double getLogProbFor(Sequence sequence,
                         int startpos)
                         throws Exception

  Returns the logarithm of the probability of (a part of) the given sequence given the model. If at least one random variable is continuous the value of density function is returned.
  For more details see `getProbFor(Sequence, int)`

  Parameters:
    `sequence` - the given sequence
    `startpos` - the start position within the given sequence
  Returns:
    the logarithm of the probability or the value of the density function of (the part of) the given sequence given the model
  Throws:
    `Exception` - if the sequence could not be handled by the model
    `NotTrainedException` - if the model is not trained yet
  See Also:
    `getProbFor(Sequence, int)`

### getLogProbFor

    double getLogProbFor(Sequence sequence)
                         throws Exception

  Returns the logarithm of the probability of the given sequence given the model. If at least one random variable is continuous the value of density function is returned.
  For more details see `getProbFor(Sequence)`

  Parameters:
    `sequence` - the given sequence for which the logarithm of the probability/the value of the density function should be returned
  Returns:
    the logarithm of the probability or the value of the density function of the part of the given sequence given the model
  Throws:
    `Exception` - if the sequence could not be handled by the model
    `NotTrainedException` - if the model is not trained yet
  See Also:
    `getProbFor(Sequence)`

### getLogProbFor

    double[] getLogProbFor(Sample data)
                           throws Exception

  This method computes the logarithm of the probabilities of all sequences in the given sample. The values are stored in an array according to the index of the respective sequence in the sample.
  The probability for any sequence shall be computed independent of all other sequences in the sample. So the result should be exactly the same as for the method `getLogProbFor(Sequence)`.

  Parameters:
    `data` - the sample of sequences
  Returns:
    an array containing the logarithm of the probabilities of all sequences of the sample
  Throws:
    `Exception` - if something went wrong
  See Also:
    `getLogProbFor(Sequence)`

### getLogProbFor

    void getLogProbFor(Sample data,
                       double[] res)
                       throws Exception

  This method computes and stores the logarithm of the probabilities for any sequence in the sample in the given `double`-array.
  The probability for any sequence shall be computed independent of all other sequences in the sample. So the result should be exactly the same as for the method `getLogProbFor(Sequence)`.

  Parameters:
    `data` - the sample of sequences
    `res` - the array for the results, has to have length `data.getNumberOfElements()` (which returns the number of sequences in the sample)
  Throws:
    `Exception` - if something went wrong
  See Also:
    `getLogProbFor(Sample)`

### getPriorTerm

    double getPriorTerm()
                        throws Exception

  Returns a value that is proportional to the prior. For ML 1 should be returned.

  Returns:
    a value that is proportional to the prior
  Throws:
    `Exception` - if something went wrong

### getLogPriorTerm

    double getLogPriorTerm()
                           throws Exception

  Returns a value that is proportional to the log of the prior. For ML 0 should be returned.

  Returns:
    a value that is proportional to the log of the prior
  Throws:
    `Exception` - if something went wrong
  See Also:
    `getPriorTerm()`

### emitSample

    Sample emitSample(int numberOfSequences,
                      int... seqLength)
                      throws NotTrainedException,
                             Exception

  This method returns a `Sample` object containing artificial sequence(s).
  There are two different possibilities to create a sample for a model with length 0 (homogeneous models).
  1. `emitSample( int n, int l )` should return a sample with `n` sequences of length `l`.
  2. `emitSample( int n, int[] l )` should return a sample with `n` sequences which have a sequence length corresponding to the entry in the given array `l`.
  There are two different possibilities to create a sample for a model with length greater than 0 (inhomogeneous models).
  `emitSample( int n )` and `emitSample( int n, null )` should return a sample with `n` sequences of length of the model ( `getLength()`).
  The standard implementation throws an `Exception`.

  Parameters:
    `numberOfSequences` - the number of sequences that should be contained in the returned sample
    `seqLength` - the length of the sequences for a homogeneous model; for an inhomogeneous model this parameter should be `null` or an array of size 0.
  Returns:
    a `Sample` containing the artificial sequence(s)
  Throws:
    `Exception` - if the emission did not succeed
    `NotTrainedException` - if the model is not trained yet
  See Also:
    `Sample`

### getAlphabetContainer

    AlphabetContainer getAlphabetContainer()

  Returns the container of alphabets that were used when constructing the model.

  Returns:
    the container of alphabets that were used when constructing the model

### getInstanceName

    String getInstanceName()

  Should return a short instance name such as iMM(0), BN(2), ...

  Returns:
    a short instance name

### getLength

    int getLength()

  Returns the length of sequences this model can classify. Models that can only classify sequences of defined length are e.g. PWM or inhomogeneous Markov models. If the model can classify sequences of arbitrary length, e.g. homogeneous Markov models, this method returns 0 (zero).

  Returns:
    the length of sequences the model can classify

### getMaximalMarkovOrder

    byte getMaximalMarkovOrder()
                               throws UnsupportedOperationException

  This method returns the maximal used Markov order, if possible.

  Returns:
    maximal used Markov order
  Throws:
    `UnsupportedOperationException` - if the model can't give a proper answer

### isTrained

    boolean isTrained()

  Returns `true` if the model has been trained successfully, `false` otherwise.

  Returns:
    `true` if the model has been trained successfully, `false` otherwise

### getCharacteristics

    ResultSet getCharacteristics()
                                 throws Exception

  Returns some information characterizing or describing the current instance of the model. This could be e.g. the number of edges for a Bayesian network or an image showing some representation of the model. The set of characteristics should always include the XML-representation of the model. The corresponding result type is `StorableResult`.

  Returns:
    the characteristics of the current instance of the model
  Throws:
    `Exception` - if some of the characteristics could not be defined
  See Also:
    `StorableResult`

### getNumericalCharacteristics

    NumericalResultSet getNumericalCharacteristics()
                                                   throws Exception

  Returns the subset of numerical values that are also returned by `getCharacteristics()`.

  Returns:
    the numerical characteristics of the current instance of the model
  Throws:
    `Exception` - if some of the characteristics could not be defined

### toString

    String toString()

  Should give a simple representation (text) of the model as `String` .

  Overrides:
    `toString` in class `Object`
  Returns:
    the representation as `String`

### setNewAlphabetContainerInstance

    boolean setNewAlphabetContainerInstance(AlphabetContainer abc)

  This method tries to set a new instance of an `AlphabetContainer` for the current model. This instance has to be consistent with the underlying instance of an `AlphabetContainer`.
  This method can be very useful to save time.

  Parameters:
    `abc` - the alphabets in an `AlphabetContainer`
  Returns:
    `true` if the new instance could be set
  See Also:
    `getAlphabetContainer()`, `AlphabetContainer.checkConsistency(AlphabetContainer)`

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