1 /** 2 * Copyright (C) Azureus Software, Inc, All Rights Reserved. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 2 7 * of the License, or (at your option) any later version. 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * You should have received a copy of the GNU General Public License 13 * along with this program; if not, write to the Free Software 14 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 15 * 16 */ 17 18 package com.aelitis.azureus.core.neuronal; 19 20 public class LogisticActivationFunction implements ActivationFunction { 21 getDerivedFunctionValueFor(double x)22 public double getDerivedFunctionValueFor(double x) { 23 return x * (1-x); 24 } 25 getValueFor(double x)26 public double getValueFor(double x) { 27 return 1.0 / (1.0 + Math.exp(-x)); 28 } 29 30 } 31