| /** |
| * 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.horn.funcs; |
| |
| import org.apache.hama.commons.math.DoubleDoubleFunction; |
| import org.apache.hama.commons.math.DoubleFunction; |
| |
| /** |
| * Factory to create the functions. |
| * |
| */ |
| public class FunctionFactory { |
| |
| /** |
| * Create a double function with specified name. |
| * |
| * @param functionName |
| * @return an appropriate double function. |
| */ |
| public static DoubleFunction createDoubleFunction(String functionName) { |
| if (functionName.equalsIgnoreCase(Sigmoid.class.getSimpleName())) { |
| return new Sigmoid(); |
| } else if (functionName.equalsIgnoreCase(Tanh.class.getSimpleName())) { |
| return new Tanh(); |
| } else if (functionName.equalsIgnoreCase(IdentityFunction.class |
| .getSimpleName())) { |
| return new IdentityFunction(); |
| } |
| |
| throw new IllegalArgumentException(String.format( |
| "No double function with name '%s' exists.", functionName)); |
| } |
| |
| /** |
| * Create a double double function with specified name. |
| * |
| * @param functionName |
| * @return an appropriate double double function. |
| */ |
| public static DoubleDoubleFunction createDoubleDoubleFunction( |
| String functionName) { |
| if (functionName.equalsIgnoreCase(SquaredError.class.getSimpleName())) { |
| return new SquaredError(); |
| } else if (functionName |
| .equalsIgnoreCase(CrossEntropy.class.getSimpleName())) { |
| return new CrossEntropy(); |
| } |
| |
| throw new IllegalArgumentException(String.format( |
| "No double double function with name '%s' exists.", functionName)); |
| } |
| |
| } |