001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018package org.apache.commons.math4.ml.neuralnet;
019
020/**
021 * Defines neighbourhood types.
022 *
023 * @since 3.3
024 */
025public enum SquareNeighbourhood {
026    /**
027     * <a href="http://en.wikipedia.org/wiki/Von_Neumann_neighborhood">
028     *  Von Neumann neighbourhood</a>: in two dimensions, each (internal)
029     * neuron has four neighbours.
030     */
031    VON_NEUMANN,
032    /**
033     * <a href="http://en.wikipedia.org/wiki/Moore_neighborhood">
034     *  Moore neighbourhood</a>: in two dimensions, each (internal)
035     * neuron has eight neighbours.
036     */
037    MOORE,
038}