symmetrize_from_upper_tri.hpp

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#ifndef STAN_MATH_OPENCL_REV_SYMMETRIZE_FROM_UPPER_TRI_HPP
#define STAN_MATH_OPENCL_REV_SYMMETRIZE_FROM_UPPER_TRI_HPP
#ifdef STAN_OPENCL
 
#include <stan/math/opencl/kernel_generator.hpp>
#include <stan/math/rev/core.hpp>
#include <stan/math/rev/fun/value_of.hpp>
 
namespace stan {
namespace math {
 
template <typename T,
          require_all_kernel_expressions_and_none_scalar_t<T>* = nullptr>
inline var_value<matrix_cl<double>> symmetrize_from_upper_tri(
    const var_value<T>& A) {
  return make_callback_var(
      symmetrize_from_upper_tri(A.val()),
      [A](vari_value<matrix_cl<double>>& res) mutable {
        A.adj() += select(row_index() < col_index(),
                          res.adj() + transpose(res.adj()),
                          select(row_index() == col_index(), res.adj(), 0.0));
      });
}
 
}  // namespace math
}  // namespace stan
 
#endif
#endif