inv_logit.hpp

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#ifndef STAN_MATH_OPENCL_KERNELS_DEVICE_FUNCTIONS_INV_LOGIT_HPP
#define STAN_MATH_OPENCL_KERNELS_DEVICE_FUNCTIONS_INV_LOGIT_HPP
#ifdef STAN_OPENCL
 
#include <stan/math/opencl/stringify.hpp>
#include <string>
 
namespace stan {
namespace math {
namespace opencl_kernels {
 
// \cond
static constexpr const char* inv_logit_device_function
    = "\n"
      "#ifndef STAN_MATH_OPENCL_KERNELS_DEVICE_FUNCTIONS_INV_LOGIT\n"
      "#define STAN_MATH_OPENCL_KERNELS_DEVICE_FUNCTIONS_INV_LOGIT\n" STRINGIFY(
          // \endcond
          double inv_logit(double x) {
            if (x < 0) {
              if (x < log(DBL_EPSILON)) {
                return exp(x);
              }
              return exp(x) / (1 + exp(x));
            }
            return 1.0 / (1 + exp(-x));
          }
          // \cond
          ) "\n#endif\n";  // NOLINT
// \endcond
 
}  // namespace opencl_kernels
}  // namespace math
}  // namespace stan
 
#endif
#endif