Package opennlp.tools.ml.naivebayes

Class NaiveBayesModel

java.lang.Object

opennlp.tools.ml.model.AbstractModel

opennlp.tools.ml.naivebayes.NaiveBayesModel

All Implemented Interfaces:

MaxentModel

public class NaiveBayesModel
extends AbstractModel

A MaxentModel implementation of the multinomial Naive Bayes classifier model.

See Also:

• AbstractModel
• MaxentModel

Nested Class Summary

Nested classes/interfaces inherited from class opennlp.tools.ml.model.AbstractModel

AbstractModel.ModelType

Constructor Summary

Constructors

Constructor	Description
NaiveBayesModel(Context[] params, String[] predLabels, String[] outcomeNames)	Initializes a NaiveBayesModel.

Method Summary

Modifier and Type	Method	Description
static double[]	eval(int[] context, double[] prior, EvalParameters model)	Evaluates a NaiveBayesModel.
double[]	eval(String[] context)	Evaluates a context.
double[]	eval(String[] context, double[] probs)	Evaluates a context.
double[]	eval(String[] context, float[] values)	Evaluates a context with the specified context values.
double[]	eval(String[] context, float[] values, double[] outsums)

Methods inherited from class opennlp.tools.ml.model.AbstractModel

equals, getAllOutcomes, getBestOutcome, getDataStructures, getIndex, getModelType, getNumOutcomes, getOutcome, hashCode

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, toString, wait, wait, wait

Constructor Details

NaiveBayesModel

public NaiveBayesModel(Context[] params,
 String[] predLabels,
 String[] outcomeNames)

Initializes a NaiveBayesModel.

Parameters:

params - The parameters to set.

predLabels - The predicted labels.

outcomeNames - The names of the outcomes.

Method Details

eval

public double[] eval(String[] context)

Evaluates a context.

Parameters:

context - An array of String names of the contextual predicates which are to be evaluated together.

Returns:

An array of the probabilities for each of the different outcomes, all of which sum to 1.

eval

public double[] eval(String[] context,
 float[] values)

Evaluates a context with the specified context values.

Parameters:

context - An array of String names of the contextual predicates which are to be evaluated together.

values - The values associated with each context.

Returns:

An array of the probabilities for each of the different outcomes, all of which sum to 1.

eval

public double[] eval(String[] context,
 double[] probs)

Evaluates a context.

Parameters:

context - An array of String names of the contextual predicates which are to be evaluated together.

probs - An array which is populated with the probabilities for each of the different outcomes, all of which sum to 1.

Returns:

An array of the probabilities for each of the different outcomes, all of which sum to 1.

eval

public double[] eval(String[] context,
 float[] values,
 double[] outsums)

eval

public static double[] eval(int[] context,
 double[] prior,
 EvalParameters model)

Evaluates a NaiveBayesModel.

Parameters:

context - The context parameters as int[].

prior - The data prior to the evaluation as double[].

model - The EvalParameters used for evaluation.

Returns:

The resulting evaluation data as double[].