001/*
002 * Copyright (c) 2015-2020, Oracle and/or its affiliates. All rights reserved.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.tribuo.math.kernel;
018
019import com.oracle.labs.mlrg.olcut.provenance.ConfiguredObjectProvenance;
020import com.oracle.labs.mlrg.olcut.provenance.impl.ConfiguredObjectProvenanceImpl;
021import org.tribuo.math.la.SparseVector;
022
023/**
024 * A linear kernel, u.dot(v).
025 */
026public class Linear implements Kernel {
027    private static final long serialVersionUID = 1L;
028
029    /**
030     * A linear kernel, u.dot(v).
031     */
032    public Linear() { }
033
034    @Override
035    public double similarity(SparseVector a, SparseVector b) {
036        return a.dot(b);
037    }
038
039    @Override
040    public String toString() {
041        return "Linear()";
042    }
043
044    @Override
045    public ConfiguredObjectProvenance getProvenance() {
046        return new ConfiguredObjectProvenanceImpl(this,"Kernel");
047    }
048}