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Trainer Agnostic Deep Learning

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/*
 * Copyright (c) 2016, Peter Abeles. All Rights Reserved.
 *
 * This file is part of DeepBoof
 *
 * Licensed 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 deepboof.impl.forward.standard;

import deepboof.forward.ActivationSigmoid;
import deepboof.tensors.Tensor_F64;

/**
 * Implementation of {@link ActivationSigmoid} for {@link Tensor_F64}.
 *
 * @author Peter Abeles
 */
public class ActivationSigmoid_F64 extends ElementWiseFunction
		implements ActivationSigmoid {

	@Override
	public void _forward(Tensor_F64 input, Tensor_F64 output) {
		int length = input.length();

		int indexIn = input.startIndex;
		int indexOut = output.startIndex;

		for (int i = 0; i < length; i++) {
			double value = input.d[indexIn+i];
			output.d[indexOut+i] = 1.0/(1.0 + Math.exp(-value));
		}
	}

	@Override
	public Class getTensorType() {
		return Tensor_F64.class;
	}
}