100 lines
3.1 KiB
C++
100 lines
3.1 KiB
C++
/********************************************************
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* ██████╗ ██████╗████████╗██╗
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* ██╔════╝ ██╔════╝╚══██╔══╝██║
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* ██║ ███╗██║ ██║ ██║
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* ██║ ██║██║ ██║ ██║
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* ╚██████╔╝╚██████╗ ██║ ███████╗
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* ╚═════╝ ╚═════╝ ╚═╝ ╚══════╝
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* Geophysical Computational Tools & Library (GCTL)
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*
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* Copyright (c) 2023 Yi Zhang (yizhang-geo@zju.edu.cn)
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*
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* GCTL is distributed under a dual licensing scheme. You can redistribute
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* it and/or modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation, either version 2
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* of the License, or (at your option) any later version. You should have
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* received a copy of the GNU Lesser General Public License along with this
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* program. If not, see <http://www.gnu.org/licenses/>.
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*
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* If the terms and conditions of the LGPL v.2. would prevent you from using
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* the GCTL, please consider the option to obtain a commercial license for a
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* fee. These licenses are offered by the GCTL's original author. As a rule,
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* licenses are provided "as-is", unlimited in time for a one time fee. Please
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* send corresponding requests to: yizhang-geo@zju.edu.cn. Please do not forget
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* to include some description of your company and the realm of its activities.
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* Also add information on how to contact you by electronic and paper mail.
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******************************************************/
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#include "loss_func.h"
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gctl::loss_func::loss_func()
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{
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uncer_type_ = 0;
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}
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gctl::loss_func::loss_func(const array<double> &tar, norm_type_e n_type)
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{
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uncer_type_ = 0;
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init(tar, n_type);
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}
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gctl::loss_func::~loss_func(){}
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void gctl::loss_func::init(const array<double> &tar, norm_type_e n_type)
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{
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tar_num_ = tar.size();
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tars_ = tar;
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norm_type_ = n_type;
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return;
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}
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void gctl::loss_func::set_uncertainty(double uncer)
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{
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uncer_type_ = 1;
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uncer_ = uncer;
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return;
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}
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void gctl::loss_func::set_uncertainty(const array<double> &uncer)
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{
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uncer_type_ = 2;
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uncers_ = uncer;
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return;
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}
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double gctl::loss_func::get_loss()
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{
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double l = loss_;
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loss_ = 0.0;
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return l;
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}
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double gctl::loss_func::evaluate(double inp, int id)
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{
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double val = (inp - tars_[id]);
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if (uncer_type_ == 1) val /= uncer_;
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else if (uncer_type_ == 2) val /= uncers_[id];
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if (norm_type_ == L1) val = fabs(val);
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if (norm_type_ == L2) val = val*val;
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loss_ += val;
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return val/tar_num_;
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}
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double gctl::loss_func::gradient(double inp, int id)
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{
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double c;
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if (uncer_type_ == 1) c = uncer_;
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else if (uncer_type_ == 2) c = uncers_[id];
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double val = (inp - tars_[id]);
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if (norm_type_ == L1 && val >= 0) val = 1.0;
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if (norm_type_ == L1 && val < 0) val = -1.0;
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if (norm_type_ == L2) val = 2.0*val;
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if (norm_type_ == L1 && uncer_type_ != 0) val /= c;
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else if (norm_type_ == L2 && uncer_type_ != 0) val /= (c*c);
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return val/tar_num_;
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} |