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/*
 * Copyright (c) 2010-2024 Haifeng Li. All rights reserved.
 *
 * Smile is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Smile is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Smile.  If not, see .
 */

package smile.deep.activation;

import org.bytedeco.pytorch.global.torch;
import smile.deep.tensor.Tensor;

/**
 * Log sigmoid activation function.
 *
 * @author Haifeng Li
 */
public class LogSigmoid extends ActivationFunction {
    /**
     * Constructor.
     */
    public LogSigmoid() {
        super("LogSigmoid", false);
    }

    @Override
    public Tensor forward(Tensor x) {
        return new Tensor(torch.log_sigmoid(x.asTorch()));
    }
}