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/*
 * File:                LinearizableBinaryCategorizerOnlineLearner.java
 * Authors:             Justin Basilico
 * Company:             Sandia National Laboratories
 * Project:             Cognitive Foundry Learning Core
 * 
 * Copyright March 28, 2011, Sandia Corporation.
 * Under the terms of Contract DE-AC04-94AL85000, there is a non-exclusive 
 * license for use of this work by or on behalf of the U.S. Government. Export 
 * of this program may require a license from the United States Government.
 *
 */

package gov.sandia.cognition.learning.algorithm.perceptron;

import gov.sandia.cognition.learning.algorithm.SupervisedBatchAndIncrementalLearner;
import gov.sandia.cognition.learning.algorithm.SupervisedIncrementalLearner;
import gov.sandia.cognition.learning.data.InputOutputPair;
import gov.sandia.cognition.learning.function.categorization.DefaultKernelBinaryCategorizer;
import gov.sandia.cognition.learning.function.categorization.LinearBinaryCategorizer;
import gov.sandia.cognition.math.matrix.VectorFactory;
import gov.sandia.cognition.math.matrix.Vectorizable;

/**
 * Interface for an online learner of a kernel binary categorizer that can also
 * be used for learning a linear categorizer. Thus, there are a second set of
 * methods that are similar to the one for the normal learner that are
 * specifically for linear learning. The companion to this class is
 * {@code KernelizableBinaryCategorizerOnlineLearner}.
 * 
 * @param   
 *      The input type that kernel learning happens on.
 * @author  Justin Basilico
 * @since   3.3.0
 * @see     KernelizableBinaryCategorizerOnlineLearner
 */
public interface LinearizableBinaryCategorizerOnlineLearner
    extends SupervisedBatchAndIncrementalLearner>
{

    /**
     * Creates the initial learned object.
     *
     * @param   vectorFactory
     *      The vector factory to use.
     * @return
     *      A new linear binary categorizer.
     */
    public LinearBinaryCategorizer createInitialLinearLearnedObject(
        final VectorFactory vectorFactory);

    /**
     * Performs a linear incremental update step on the given object using the
     * given supervised data.
     *
     * @param   target
     *      The target object to update.
     * @param   data
     *      The supervised training data
     * @param   vectorFactory
     *      The vector factory to use.
     */
    public void update(
        final LinearBinaryCategorizer target,
        final Iterable> data,
        final VectorFactory vectorFactory);

    /**
     * Performs a linear incremental update step on the given object using the
     * given supervised data.
     *
     * @param   target
     *      The target object to update.
     * @param   data
     *      The supervised training data
     * @param   vectorFactory
     *      The vector factory to use.
     */
    public void update(
        final LinearBinaryCategorizer target,
        final InputOutputPair data,
        final VectorFactory vectorFactory);

    /**
     * Performs a linear incremental update step on the given object using the
     * given supervised data.
     *
     * @param   target
     *      The target object to update.
     * @param   input
     *      The supervised input value.
     * @param   output
     *      The supervised output value (label).
     * @param   vectorFactory
     *      The vector factory to use.
     */
    public void update(
        final LinearBinaryCategorizer target,
        final Vectorizable input,
        final Boolean output,
        final VectorFactory vectorFactory);
    
    /**
     * Performs a linear incremental update step on the given object using the
     * given supervised data.
     *
     * @param   target
     *      The target object to update.
     * @param   input
     *      The supervised input value.
     * @param   output
     *      The supervised output value (label).
     * @param   vectorFactory
     *      The vector factory to use.
     */
    public void update(
        final LinearBinaryCategorizer target,
        final Vectorizable input,
        final boolean output,
        final VectorFactory vectorFactory);

    /**
     * Creates a new linear learner using the standard learning interfaces
     * based on this learner and its parameters.
     *
     * @param   vectorFactory
     *      The vector factory to use.
     * @return
     *      A linear version of this learning algorithm.
     */
    public SupervisedIncrementalLearner createLinearLearner(
        final VectorFactory vectorFactory);

}