Phi_approx.hpp

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#ifndef STAN_MATH_OPENCL_REV_PHI_APPROX_HPP
#define STAN_MATH_OPENCL_REV_PHI_APPROX_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>> Phi_approx(const var_value<T>& A) {
  return make_callback_var(
      Phi_approx(A.val()), [A](vari_value<matrix_cl<double>>& res) mutable {
        A.adj() += elt_multiply(
            elt_multiply(elt_multiply(res.adj(), res.val()), 1 - res.val()),
            3.0 * 0.07056 * square(A.val()) + 1.5976);
      });
}
 
}  // namespace math
}  // namespace stan
 
#endif
#endif