/*
 * LensKit, an open source recommender systems toolkit.
 * Copyright 2010-2014 LensKit Contributors.  See CONTRIBUTORS.md.
 * Work on LensKit has been funded by the National Science Foundation under
 * grants IIS 05-34939, 08-08692, 08-12148, and 10-17697.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
package org.lenskit.bias;

/**
 * Bias model that only uses a global bias.
 */
public class GlobalBiasModel implements BiasModel {
    private final double intercept;

    /**
     * Construct a new global bias model.
     * @param bias The global bias.
     */
    public GlobalBiasModel(double bias) {
        intercept = bias;
    }

    @Override
    public double getIntercept() {
        return intercept;
    }

    @Override
    public double getUserBias(long user) {
        return 0;
    }

    @Override
    public double getItemBias(long item) {
        return 0;
    }
}

@@ -1017,111 +1017,432 @@
 s;%0A%0A
-/**%0A * Bias model that only uses a global bias.%0A */%0Apublic class GlobalBiasModel implements BiasModel %7B
+import org.grouplens.grapht.annotation.DefaultProvider;%0Aimport org.lenskit.inject.Shareable;%0A%0Aimport javax.annotation.concurrent.Immutable;%0Aimport java.io.Serializable;%0A%0A/**%0A * Bias model that only uses a global bias.%0A */%0A@Shareable%0A@Immutable%0A@DefaultProvider(GlobalAverageRatingBiasModelProvider.class)%0Apublic class GlobalBiasModel implements BiasModel, Serializable %7B%0A    private static final long serialVersionUID = 1L;%0A
 %0A   

make global bias model sharable