PressureBoundaryVariableToSimulation.cpp

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#include <polyfem/optimization/var2sims/PressureBoundaryVariableToSimulation.hpp>
 
#include <polyfem/Common.hpp>
#include <polyfem/varforms/diff/DifferentiableVarForm.hpp>
#include <polyfem/assembler/GenericProblem.hpp>
#include <polyfem/optimization/AdjointTools.hpp>
#include <polyfem/optimization/VarFormDiff.hpp>
#include <polyfem/optimization/var2sims/ActiveSelectionUtils.hpp>
#include <polyfem/utils/JSONUtils.hpp>
#include <polyfem/utils/Logger.hpp>
 
#include <Eigen/Core>
 
#include <cassert>
#include <string>
#include <utility>
#include <vector>
#include <algorithm>
 
namespace polyfem::solver
{
 
    PressureBoundaryVariableToSimulation::PressureBoundaryVariableToSimulation(
        VarFormPtrs varforms,
        DiffCachePtrs diff_caches,
        CompositeParametrization parametrizations,
        Eigen::VectorXi active_boundary_ids,
        Eigen::VectorXi active_time_slices)
        : is_transient_(varforms[0]->get_problem().is_time_dependent()),
          time_steps_(0),
          varforms_(std::move(varforms)),
          diff_caches_(std::move(diff_caches)),
          parametrization_(std::move(parametrizations)),
          active_boundary_ids_(std::move(active_boundary_ids)),
          active_time_slices_(std::move(active_time_slices))
    {
        assert(!varforms_.empty());
        assert(varforms_.size() == diff_caches_.size());
 
        for (auto &varform : varforms_)
        {
            if (varform->get_problem().is_time_dependent() != is_transient_)
            {
                log_and_throw_adjoint_error("Fail to construct pressure boundary variable to simulation. Reason: inconsistent transient/static varforms.");
            }
        }
 
        // time_step field might not be populated for static problem.
        if (is_transient_)
        {
            time_steps_ = varforms_[0]->get_args()["time"]["time_steps"].get<int>();
        }
 
        // Expand implicit all-active boundary id selection (keep JSON order; no sort/unique pass).
        if (active_boundary_ids_.size() == 0)
        {
            json boundary_json = varforms_[0]->get_args()["boundary_conditions"]["pressure_boundary"];
            std::vector<int> tmp;
            for (const json &bc : utils::json_as_array(boundary_json))
            {
                tmp.push_back(bc["id"].get<int>());
            }
 
            if (tmp.empty())
            {
                log_and_throw_adjoint_error("Fail to construct pressure boundary variable to simulation. Reason: No pressure boundary");
            }
 
            active_boundary_ids_ = Eigen::Map<Eigen::VectorXi>(tmp.data(), tmp.size());
        }
 
        // Expand implicit all-active time slice selection (transient only).
        if (is_transient_ && active_time_slices_.size() == 0)
        {
            active_time_slices_ = Eigen::VectorXi::LinSpaced(time_steps_, 0, time_steps_ - 1);
        }
 
        // Validate expanded selections against every varform.
        std::string reason;
        if (!is_active_pressure_boundary_ids_valid(active_boundary_ids_, varforms_, reason))
        {
            log_and_throw_adjoint_error("Fail to construct pressure boundary variable to simulation. Reason: {}", reason);
        }
        if (is_transient_ && !is_active_time_slices_valid(active_time_slices_, varforms_, reason))
        {
            log_and_throw_adjoint_error("Fail to construct pressure boundary variable to simulation. Reason: {}", reason);
        }
    }
 
    std::string PressureBoundaryVariableToSimulation::name() const
    {
        return "pressure";
    }
 
    ParameterType PressureBoundaryVariableToSimulation::parameter_type() const
    {
        return ParameterType::PressureBC;
    }
 
    bool PressureBoundaryVariableToSimulation::affects_varform(const varform::DifferentiableVarForm &target) const
    {
        for (auto &varform : varforms_)
        {
            if (varform.get() == &target)
            {
                return true;
            }
        }
        return false;
    }
 
    void PressureBoundaryVariableToSimulation::update(const Eigen::VectorXd &x)
    {
        Eigen::VectorXd y = parametrization_.eval(x);
        assert(y.size() == para_out_dof());
 
        for (auto &varform : varforms_)
        {
            if (is_transient_)
            {
                for (int ti = 0; ti < active_time_slices_.size(); ++ti)
                {
                    int time_step = active_time_slices_(ti) + 1;
                    for (int bi = 0; bi < active_boundary_ids_.size(); ++bi)
                    {
                        int boundary_id = active_boundary_ids_(bi);
                        varform->set_pressure_boundary(boundary_id, time_step, y(ti * active_boundary_ids_.size() + bi));
                    }
                }
            }
            else
            {
                for (int bi = 0; bi < active_boundary_ids_.size(); ++bi)
                {
                    int boundary_id = active_boundary_ids_(bi);
                    varform->set_pressure_boundary(boundary_id, /*time_step=*/1, y(bi));
                }
            }
        }
    }
 
    void PressureBoundaryVariableToSimulation::update_state_variables(const Eigen::VectorXd &x, Eigen::VectorXd &state_variables) const
    {
        assert(state_variables.size() == para_out_dof());
        state_variables = parametrization_.eval(x);
    }
 
    Eigen::VectorXd PressureBoundaryVariableToSimulation::compute_adjoint_term(const Eigen::VectorXd &x) const
    {
        Eigen::VectorXd term = Eigen::VectorXd::Zero(para_out_dof());
        int bnum = active_boundary_ids_.size();
 
        // AdjointTool helps take std::vector<int> instead of Eigen::Vector.
        // Create temp to workaround this.
        std::vector<int> tmp(active_boundary_ids_.data(), active_boundary_ids_.data() + bnum);
 
        for (int si = 0; si < varforms_.size(); ++si)
        {
            auto &varform = varforms_[si];
            auto &diff_cache = diff_caches_[si];
 
            if (is_transient_)
            {
                Eigen::MatrixXd adjoint_p = get_adjoint_mat(*varform, *diff_cache, 0);
                Eigen::MatrixXd adjoint_nu = get_adjoint_mat(*varform, *diff_cache, 1);
 
                Eigen::VectorXd cur_term;
                AdjointTools::dJ_pressure_transient_adjoint_term(*varform, *diff_cache, tmp, adjoint_nu, adjoint_p, cur_term);
 
                assert(cur_term.size() == time_steps_ * bnum);
                for (int ti = 0; ti < active_time_slices_.size(); ++ti)
                {
                    int slice = active_time_slices_(ti);
                    term.segment(ti * bnum, bnum) += cur_term.segment(slice * bnum, bnum);
                }
            }
            else
            {
                Eigen::MatrixXd adjoint_p = get_adjoint_mat(*varform, *diff_cache, 0);
                Eigen::VectorXd cur_term;
                AdjointTools::dJ_pressure_static_adjoint_term(*varform, tmp, diff_cache->u(0), adjoint_p, cur_term);
                assert(cur_term.size() == bnum);
                term += cur_term;
            }
        }
 
        assert(term.size() == para_out_dof());
        return parametrization_.apply_jacobian(term, x);
    }
 
    int PressureBoundaryVariableToSimulation::inverse_dof() const
    {
        return parametrization_.inverse_size(para_out_dof());
    }
 
    Eigen::VectorXd PressureBoundaryVariableToSimulation::inverse_eval() const
    {
        Eigen::VectorXd y = Eigen::VectorXd::Zero(para_out_dof());
        int bnum = active_boundary_ids_.size();
 
        json boundary_json = varforms_[0]->get_args()["boundary_conditions"]["pressure_boundary"];
        std::vector<json> boundaries = utils::json_as_array(boundary_json);
 
        for (int bi = 0; bi < bnum; ++bi)
        {
            int boundary_id = active_boundary_ids_(bi);
 
            auto pred = [boundary_id](const json &bc) { return bc["id"].get<int>() == boundary_id; };
            auto iter = std::find_if(boundaries.begin(), boundaries.end(), pred);
            if (iter == boundaries.end())
            {
                logger().warn("Cannot find pressure boundary id {} in JSON; falling back to zero.", boundary_id);
                continue;
            }
 
            const json &value = (*iter)["value"];
            if (is_transient_)
            {
                Eigen::VectorXd pressures;
                try
                {
                    pressures = value;
                }
                catch (std::exception &err)
                {
                }
 
                int required = time_steps_ + 1;
                if (pressures.size() != required)
                {
                    logger().warn("Unsupported initial value spec for pressure boundary id {}; falling back to zero.", boundary_id);
                    pressures = Eigen::VectorXd::Zero(required);
                }
 
                for (int ti = 0; ti < active_time_slices_.size(); ++ti)
                {
                    int slice = active_time_slices_(ti);
                    y(ti * bnum + bi) = pressures(slice + 1);
                }
            }
            else
            {
                if (value.is_number())
                {
                    y(bi) = value.get<double>();
                }
                else
                {
                    logger().warn("Unsupported initial value spec for pressure boundary id {}; falling back to zero.", boundary_id);
                }
            }
        }
 
        return parametrization_.inverse_eval(y);
    }
 
    Eigen::VectorXd PressureBoundaryVariableToSimulation::apply_parametrization_jacobian(const Eigen::VectorXd &, const Eigen::VectorXd &) const
    {
        // Not implemented because there's no user
        log_and_throw_adjoint_error("apply_parametrization_jacobian is not implemented in {} variable to simulation.", name());
    }
 
    int PressureBoundaryVariableToSimulation::para_out_dof() const
    {
        return is_transient_ ? (active_time_slices_.size() * active_boundary_ids_.size()) : active_boundary_ids_.size();
    }
 
} // namespace polyfem::solver