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// $Id$ |
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/* |
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Copyright (C) 2022 Peter Johansson |
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This file is part of the yat library, https://dev.thep.lu.se/yat |
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The yat library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU General Public License as |
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published by the Free Software Foundation; either version 3 of the |
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License, or (at your option) any later version. |
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The yat library is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with yat. If not, see <https://www.gnu.org/licenses/>. |
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*/ |
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#include <config.h> |
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|
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#include "MultiCox.h" |
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|
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#include "detail/Cox.h" |
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|
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#include <yat/utility/BFGS2.h> |
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#include <yat/utility/Matrix.h> |
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#include <yat/utility/MatrixBase.h> |
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#include <yat/utility/Vector.h> |
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#include <yat/utility/VectorBase.h> |
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|
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#include <gsl/gsl_cdf.h> |
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|
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#include <cassert> |
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#include <cmath> |
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|
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namespace theplu { |
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namespace yat { |
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namespace regression { |
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|
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class MultiCox::Impl : public cox::Implementation<utility::Vector> |
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{ |
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public: |
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using cox::Implementation<utility::Vector>::add; |
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void add(const utility::MatrixBase& X, |
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const utility::VectorBase& times, |
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const std::vector<char>& events) |
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{ |
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assert(times.size() == events.size()); |
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assert(X.columns() == events.size()); |
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for (size_t i=0; i<times.size(); ++i) |
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add(X.column_const_view(i), times(i), events[i]); |
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} |
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|
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|
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double b(size_t i) const |
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{ |
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assert(i < beta_.size()); |
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return beta_(i); |
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} |
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|
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|
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const utility::Matrix& covariance(void) const |
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{ |
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return beta_cov_; |
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} |
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|
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|
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double hazard_ratio(size_t i) const |
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{ |
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return exp(b(i)); |
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} |
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|
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|
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double hazard_ratio_lower_CI(size_t i, double alpha) const |
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{ |
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return exp(b(i) - hazard_ratio_CI(i, alpha)); |
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} |
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|
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|
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double hazard_ratio_upper_CI(size_t i, double alpha) const |
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{ |
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return exp(b(i) + hazard_ratio_CI(i, alpha)); |
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} |
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|
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|
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double hazard_ratio_CI(size_t i, double alpha) const |
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{ |
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assert(i < beta_cov_.rows()); |
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assert(i < beta_cov_.columns()); |
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double z = gsl_cdf_ugaussian_Qinv(0.5 * (1.0 - alpha)); |
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return z * std::sqrt(beta_cov_(i,i)); |
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} |
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|
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|
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double p(size_t i) const |
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{ |
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if (b(i) > 0) |
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return 2 * gsl_cdf_ugaussian_Q(z(i)); |
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return 2 * gsl_cdf_ugaussian_P(z(i)); |
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} |
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|
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|
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void train(void) |
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{ |
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if (data_.empty()) |
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return; |
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|
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size_t n = data_.front().x.size(); |
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prepare_times(); |
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logL func(times_); |
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beta_.resize(n, 0.0); |
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utility::BFGS2 solver(n); |
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solver(beta_, func, utility::MultiMinimizerDerivative::Gradient(1e-3)); |
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|
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// Calculate 2nd deriviate at beta_; |
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utility::Matrix H(n, n); |
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func.hessian(beta_, H); |
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inverse_svd(H, beta_cov_); |
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} |
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|
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|
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double z(size_t i) const |
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{ |
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assert(i < beta_cov_.rows()); |
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assert(i < beta_cov_.columns()); |
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return b(i) / std::sqrt(beta_cov_(i,i)); |
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} |
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|
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|
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private: |
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utility::Vector beta_; |
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utility::Matrix beta_cov_; |
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|
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class logL |
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{ |
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const std::vector<TimePoint>& times_; |
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public: |
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logL(const std::vector<TimePoint>& times) |
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: times_(times) |
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{} |
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|
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|
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double operator()(const utility::VectorBase& beta) |
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{ |
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double f = 0; |
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double theta_Q = 0; |
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for (auto time = times_.rbegin(); time!=times_.rend(); ++time) { |
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double sum_event_theta = 0; |
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for (auto it = time->events_begin(); it!=time->events_end(); ++it) |
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sum_event_theta += it->theta(beta); |
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theta_Q += sum_event_theta; |
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for (auto it=time->censored_begin(); it!=time->censored_end(); ++it) |
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theta_Q += it->theta(beta); |
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|
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for (auto it = time->events_begin(); it!=time->events_end(); ++it) { |
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const size_t k = it - time->events_begin(); |
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double r = static_cast<double>(k) / time->size(); |
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f -= it->x * beta; |
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f += log(theta_Q - r * sum_event_theta); |
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} |
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} |
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return f; |
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} |
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|
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|
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void operator()(const utility::VectorBase& beta, |
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utility::VectorMutable& gradient) |
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{ |
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assert(beta.size() == gradient.size()); |
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gradient.all(0.0); |
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size_t n = beta.size(); |
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|
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double theta_Q = 0; |
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utility::Vector thetaX_Q(n, 0.0); |
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for (auto time = times_.rbegin(); time!=times_.rend(); ++time) { |
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double sum_event_theta = 0; |
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utility::Vector sum_event_thetaX(n, 0); |
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for (auto it = time->events_begin(); it!=time->events_end(); ++it) { |
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double theta = it->theta(beta); |
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sum_event_theta += theta; |
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sum_event_thetaX += theta * it->x; |
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} |
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theta_Q += sum_event_theta; |
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thetaX_Q += sum_event_thetaX; |
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|
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for (auto it=time->censored_begin(); it!=time->censored_end(); ++it){ |
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double theta = it->theta(beta); |
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theta_Q += theta; |
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thetaX_Q += theta * it->x; |
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} |
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|
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// loop over events at time point t |
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for (auto it = time->events_begin(); it!=time->events_end(); ++it) { |
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const size_t k = it - time->events_begin(); |
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double r = static_cast<double>(k) / time->size(); |
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|
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gradient -= it->x; |
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gradient += (1.0 / (theta_Q - r * sum_event_theta)) * |
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(thetaX_Q - r * sum_event_thetaX); |
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} |
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} |
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} |
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|
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|
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void hessian(const utility::VectorBase& beta, utility::Matrix& H) const |
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{ |
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size_t n = beta.size(); |
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H.all(0.0); |
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|
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double sum_theta = 0; |
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utility::Vector sum_thetaX(n,0); |
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utility::Matrix sum_thetaXX(n, n, 0); |
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for (const auto& t : times_) { |
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for (auto it = t.begin; it!=t.end; ++it) { |
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double theta = it->theta(beta); |
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sum_theta += theta; |
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sum_thetaX += theta * it->x; |
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for (size_t i=0; i<n; ++i) |
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sum_thetaXX.row_view(i) += theta * it->x(i) * it->x; |
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} |
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} |
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|
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// loop over unique time points |
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for (const auto& t : times_) { |
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|
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if (t.events_begin() != t.events_end()) { |
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// sum over all events in H_j |
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double part_sum_theta = 0; |
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utility::Vector part_sum_thetaX(n, 0); |
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utility::Matrix part_sum_thetaXX(n, n,0); |
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for (auto it = t.events_begin(); it!=t.events_end(); ++it) { |
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double theta = it->theta(beta); |
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part_sum_theta += theta; |
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part_sum_thetaX += theta * it->x; |
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for (size_t i=0; i<n; ++i) |
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part_sum_thetaXX.row_view(i) += theta * it->x(i) * it->x; |
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} |
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|
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// loop over events at time point t |
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for (auto it = t.events_begin(); it!=t.events_end(); ++it) { |
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const size_t k = it - t.events_begin(); |
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double r = static_cast<double>(k) / t.size(); |
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double S_theta = sum_theta - r * part_sum_theta; |
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utility::Vector S_thetaX = sum_thetaX - r * part_sum_thetaX; |
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utility::Matrix S_thetaXX = sum_thetaXX - r * part_sum_thetaXX; |
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|
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H += (1.0 / S_theta) * S_thetaXX; |
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utility::Vector ratio = (1.0 / S_theta) * S_thetaX; |
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for (size_t i=0; i<n; ++i) |
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H.row_view(i) -= ratio(i) * ratio; |
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} |
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} |
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|
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// update the cumulative sums |
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for (auto it = t.begin; it!=t.end; ++it) { |
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double theta = it->theta(beta); |
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sum_theta -= theta; |
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sum_thetaX -= theta * it->x; |
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for (size_t i=0; i<n; ++i) |
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sum_thetaXX.row_view(i) -= theta * it->x(i) * it->x; |
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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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|
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MultiCox::MultiCox(void) |
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: pimpl_(new Impl) |
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{ |
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} |
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|
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|
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MultiCox::MultiCox(const MultiCox& other) |
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: pimpl_(new Impl(*other.pimpl_)) |
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{ |
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} |
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|
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|
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MultiCox::MultiCox(MultiCox&& other) |
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{ |
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std::swap(pimpl_, other.pimpl_); |
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} |
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|
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|
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MultiCox::~MultiCox(void) |
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{ |
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} |
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|
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|
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MultiCox& MultiCox::operator=(const MultiCox& other) |
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{ |
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assert(other.pimpl_); |
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pimpl_.reset(new Impl(*other.pimpl_)); |
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peter |
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return *this; |
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} |
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peter |
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|
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|
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MultiCox& MultiCox::operator=(MultiCox&& other) |
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peter |
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{ |
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std::swap(pimpl_, other.pimpl_); |
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peter |
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return *this; |
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peter |
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} |
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peter |
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|
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|
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void MultiCox::add(const utility::VectorBase& x, double time, |
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peter |
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bool event) |
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{ |
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pimpl_->add(x, time, event); |
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} |
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peter |
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|
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peter |
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|
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void MultiCox::add(const utility::MatrixBase& X, |
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peter |
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const utility::VectorBase& times, |
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peter |
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const std::vector<char>& event) |
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peter |
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{ |
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pimpl_->add(X, times, event); |
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peter |
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} |
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|
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peter |
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|
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peter |
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double MultiCox::b(size_t i) const |
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{ |
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return pimpl_->b(i); |
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19 Aug 22 |
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} |
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peter |
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|
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peter |
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|
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peter |
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void MultiCox::clear(void) |
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peter |
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{ |
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pimpl_->clear(); |
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19 Aug 22 |
peter |
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} |
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|
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|
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const utility::MatrixBase& MultiCox::covariance(void) const |
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{ |
4198 |
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return pimpl_->covariance(); |
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19 Aug 22 |
peter |
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} |
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peter |
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|
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19 Aug 22 |
peter |
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|
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peter |
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double MultiCox::hazard_ratio(size_t i) const |
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{ |
4198 |
19 Aug 22 |
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return pimpl_->hazard_ratio(i); |
4198 |
19 Aug 22 |
peter |
345 |
} |
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peter |
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|
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19 Aug 22 |
peter |
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|
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19 Aug 22 |
peter |
348 |
double MultiCox::hazard_ratio_lower_CI(size_t i, double alpha) const |
4198 |
19 Aug 22 |
peter |
349 |
{ |
4198 |
19 Aug 22 |
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350 |
return pimpl_->hazard_ratio_lower_CI(i, alpha); |
4198 |
19 Aug 22 |
peter |
351 |
} |
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19 Aug 22 |
peter |
352 |
|
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19 Aug 22 |
peter |
353 |
|
4198 |
19 Aug 22 |
peter |
354 |
double MultiCox::hazard_ratio_upper_CI(size_t i, double alpha) const |
4198 |
19 Aug 22 |
peter |
355 |
{ |
4198 |
19 Aug 22 |
peter |
356 |
return pimpl_->hazard_ratio_upper_CI(i, alpha); |
4198 |
19 Aug 22 |
peter |
357 |
} |
4198 |
19 Aug 22 |
peter |
358 |
|
4198 |
19 Aug 22 |
peter |
359 |
|
4198 |
19 Aug 22 |
peter |
360 |
double MultiCox::p(size_t i) const |
4198 |
19 Aug 22 |
peter |
361 |
{ |
4198 |
19 Aug 22 |
peter |
362 |
return pimpl_->p(i); |
4198 |
19 Aug 22 |
peter |
363 |
} |
4198 |
19 Aug 22 |
peter |
364 |
|
4198 |
19 Aug 22 |
peter |
365 |
|
4198 |
19 Aug 22 |
peter |
366 |
void MultiCox::train(void) |
4198 |
19 Aug 22 |
peter |
367 |
{ |
4198 |
19 Aug 22 |
peter |
368 |
pimpl_->train(); |
4198 |
19 Aug 22 |
peter |
369 |
} |
4198 |
19 Aug 22 |
peter |
370 |
|
4198 |
19 Aug 22 |
peter |
371 |
|
4198 |
19 Aug 22 |
peter |
372 |
double MultiCox::z(size_t i) const |
4198 |
19 Aug 22 |
peter |
373 |
{ |
4198 |
19 Aug 22 |
peter |
374 |
return pimpl_->z(i); |
4198 |
19 Aug 22 |
peter |
375 |
} |
4198 |
19 Aug 22 |
peter |
376 |
|
4198 |
19 Aug 22 |
peter |
377 |
|
4198 |
19 Aug 22 |
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378 |
}}} |