trace.hpp

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#ifndef STAN_MATH_OPENCL_REV_TRACE_HPP
#define STAN_MATH_OPENCL_REV_TRACE_HPP
#ifdef STAN_OPENCL
 
#include <stan/math/opencl/prim/sum.hpp>
#include <stan/math/opencl/prim/trace.hpp>
#include <stan/math/rev/core.hpp>
#include <stan/math/rev/fun/value_of.hpp>
#include <stan/math/rev/core/reverse_pass_callback.hpp>
 
namespace stan {
namespace math {
 
template <typename T,
          require_all_kernel_expressions_and_none_scalar_t<T>* = nullptr>
inline var trace(const var_value<T>& x) {
  return make_callback_var(trace(value_of(x)), [x](vari& res) mutable {
    diagonal(x.adj()) += res.adj();
  });
}
 
}  // namespace math
}  // namespace stan
 
#endif
#endif