| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.ignite.ml.naivebayes.gaussian; |
| |
| import java.io.Serializable; |
| import java.util.HashMap; |
| import java.util.Map; |
| import org.apache.ignite.ml.math.util.MapUtil; |
| |
| /** Service class is used to calculate means and variances. */ |
| class GaussianNaiveBayesSumsHolder implements Serializable, AutoCloseable { |
| /** Serial version uid. */ |
| private static final long serialVersionUID = 1L; |
| |
| /** Sum of all values for all features for each label */ |
| Map<Double, double[]> featureSumsPerLbl = new HashMap<>(); |
| |
| /** Sum of all squared values for all features for each label */ |
| Map<Double, double[]> featureSquaredSumsPerLbl = new HashMap<>(); |
| |
| /** Rows count for each label */ |
| Map<Double, Integer> featureCountersPerLbl = new HashMap<>(); |
| |
| /** */ |
| public GaussianNaiveBayesSumsHolder() { |
| } |
| |
| /** */ |
| public Map<Double, double[]> getFeatureSumsPerLbl() { |
| return featureSumsPerLbl; |
| } |
| |
| /** */ |
| public Map<Double, double[]> getFeatureSquaredSumsPerLbl() { |
| return featureSquaredSumsPerLbl; |
| } |
| |
| /** */ |
| public Map<Double, Integer> getFeatureCountersPerLbl() { |
| return featureCountersPerLbl; |
| } |
| |
| /** Merge to current */ |
| GaussianNaiveBayesSumsHolder merge(GaussianNaiveBayesSumsHolder other) { |
| featureSumsPerLbl = MapUtil.mergeMaps(featureSumsPerLbl, other.featureSumsPerLbl, this::sum, HashMap::new); |
| featureSquaredSumsPerLbl = MapUtil.mergeMaps(featureSquaredSumsPerLbl, other.featureSquaredSumsPerLbl, this::sum, HashMap::new); |
| featureCountersPerLbl = MapUtil.mergeMaps(featureCountersPerLbl, other.featureCountersPerLbl, (i1, i2) -> i1 + i2, HashMap::new); |
| return this; |
| } |
| |
| /** In-place operation. Sums {@code arr2} to {@code arr1} element to element. */ |
| private double[] sum(double[] arr1, double[] arr2) { |
| for (int i = 0; i < arr1.length; i++) |
| arr1[i] += arr2[i]; |
| |
| return arr1; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public void close() { |
| // Do nothing, GC will clean up. |
| } |
| } |