lb_constrain.hpp

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#ifndef STAN_MATH_OPENCL_REV_CONSTRAINT_LB_CONSTRAIN_HPP
#define STAN_MATH_OPENCL_REV_CONSTRAINT_LB_CONSTRAIN_HPP
#ifdef STAN_OPENCL
 
#include <stan/math/opencl/rev/adjoint_results.hpp>
#include <stan/math/opencl/matrix_cl.hpp>
#include <stan/math/opencl/kernel_generator.hpp>
#include <stan/math/opencl/prim/sum.hpp>
#include <stan/math/rev/core.hpp>
#include <stan/math/rev/fun/value_of.hpp>
#include <stan/math/rev/core/reverse_pass_callback.hpp>
#include <stan/math/prim/fun/constants.hpp>
#include <stan/math/prim/fun/value_of.hpp>
#include <stan/math/prim/meta/is_kernel_expression.hpp>
 
namespace stan {
namespace math {
 
template <typename T_x, typename T_lb,
          require_all_prim_or_rev_kernel_expression_t<T_x, T_lb>* = nullptr,
          require_any_var_t<T_x, T_lb>* = nullptr,
          require_any_not_stan_scalar_t<T_x, T_lb>* = nullptr>
inline var_value<matrix_cl<double>> lb_constrain(T_x&& x, T_lb&& lb) {
  arena_t<T_x> x_arena = std::forward<T_x>(x);
  arena_t<T_lb> lb_arena = std::forward<T_lb>(lb);
 
  return make_callback_var(
      lb_constrain(value_of(x_arena), value_of(lb_arena)),
      [x_arena, lb_arena](vari_value<matrix_cl<double>>& res) mutable {
        auto lb_inf = value_of(lb_arena) == NEGATIVE_INFTY;
        adjoint_results(x_arena, lb_arena) += expressions(
            select(lb_inf, res.adj(),
                   elt_multiply(res.adj(), exp(value_of(x_arena)))),
            select(lb_inf, 0, res.adj()));
      });
}
 
template <typename T_x, typename T_lb,
          require_all_prim_or_rev_kernel_expression_t<T_x, T_lb>* = nullptr,
          require_any_var_t<T_x, T_lb>* = nullptr,
          require_any_not_stan_scalar_t<T_x, T_lb>* = nullptr>
inline var_value<matrix_cl<double>> lb_constrain(T_x&& x, T_lb&& lb, var& lp) {
  arena_t<T_x> x_arena = std::forward<T_x>(x);
  arena_t<T_lb> lb_arena = std::forward<T_lb>(lb);
 
  double lp_inc = 0;
  matrix_cl<double> res
      = lb_constrain(value_of(x_arena), value_of(lb_arena), lp_inc);
  lp += lp_inc;
 
  return make_callback_var(
      std::move(res),
      [x_arena, lb_arena, lp](vari_value<matrix_cl<double>>& res) mutable {
        auto lb_inf = value_of(lb_arena) == NEGATIVE_INFTY;
        adjoint_results(x_arena, lb_arena) += expressions(
            select(lb_inf, res.adj(),
                   elt_multiply(res.adj(), exp(value_of(x_arena))) + lp.adj()),
            select(lb_inf, 0, res.adj()));
      });
}
 
}  // namespace math
}  // namespace stan
 
#endif
#endif