RAMP_mapping_kernel.h

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/*
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     from this software without specific prior written permission.
 
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*/
 
#ifndef __NEKO_CUDA_RAMP_MAPPING_KERNELS__
#define __NEKO_CUDA_RAMP_MAPPING_KERNELS__
 
template <typename T>
__global__ void convex_down_RAMP_mapping_apply_kernel(
    const T f_min, const T f_max, const T q, T* __restrict__ X_out_d,
    T* __restrict__ X_in_d, const int n) {
 
    const int idx = blockIdx.x * blockDim.x + threadIdx.x;
    const int str = blockDim.x * gridDim.x;
 
    for (int i = idx; i < n; i += str) {
        X_out_d[i] = f_min 
            + (f_max - f_min) * X_in_d[i] / (1.0 + q * (1.0 + X_in_d[i]));
    }
}
 
template <typename T>
__global__ void convex_down_RAMP_mapping_apply_backward_kernel(
    const T f_min, const T f_max, const T q, T* __restrict__ dF_dX_in_d,
    T* __restrict__ dF_dX_out_d, T* __restrict__ X_in_d, const int n) {
 
    const int idx = blockIdx.x * blockDim.x + threadIdx.x;
    const int str = blockDim.x * gridDim.x;
 
    for (int i = idx; i < n; i += str) {
        dF_dX_in_d[i] = (f_max - f_min) * (q + 1.0) / (
                (1.0 - q * (X_in_d[i] - 1.0)) * (1.0 - q * (X_in_d[i] - 1.0))
            ) * dF_dX_out_d[i];
    }
}
template <typename T>
__global__ void convex_up_RAMP_mapping_apply_kernel(
    const T f_min, const T f_max, const T q, T* __restrict__ X_out_d,
    T* __restrict__ X_in_d, const int n) {
 
    const int idx = blockIdx.x * blockDim.x + threadIdx.x;
    const int str = blockDim.x * gridDim.x;
 
    for (int i = idx; i < n; i += str) {
        X_out_d[i] = f_min 
            + (f_max - f_min) * X_in_d[i] * (1.0 + q) / (X_in_d[i] + q);
    }
}
 
template <typename T>
__global__ void convex_up_RAMP_mapping_apply_backward_kernel(
    const T f_min, const T f_max, const T q, T* __restrict__ dF_dX_in_d,
    T* __restrict__ dF_dX_out_d, T* __restrict__ X_in_d, const int n) {
 
    const int idx = blockIdx.x * blockDim.x + threadIdx.x;
    const int str = blockDim.x * gridDim.x;
 
    for (int i = idx; i < n; i += str) {
        dF_dX_in_d[i] = (f_max - f_min) 
            * (q + 1.0) / ( (X_in_d[i] + q) * (X_in_d[i] + q)) * dF_dX_out_d[i];
    }
}
#endif // __NEKO_CUDA_RAMP_MAPPING_KERNELS__