36 lines
935 B
Plaintext
36 lines
935 B
Plaintext
#ifndef __SOFTMAX_KERNEL_CUH__
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#define __SOFTMAX_KERNEL_CUH__
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#include <cuda_runtime.h>
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#include <math.h>
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#include <float.h>
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#include "../utils/cuda_utils.cuh"
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__global__ void softmax_forward_kernel(float* out, float inv_temperature, const float* inp, int N, int T) {
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// Implement this
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int x = blockDim.x * blockIdx.x + threadIdx.x;
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if(x < N*T){
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int own_pos = x % T;
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const float* a = inp + x * T;
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float maxval = -FLT_MAX;
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for (int i = 0; i <= own_pos; i++) {
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maxval = fmaxf(maxval,a[i]);
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}
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float sumval = 0.0f;
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for (int i = 0; i <= own_pos; ++i) {
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float ev = expf(inv_temperature * (a[i] - maxval));
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sumval += ev;
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out[x * T + i] = ev;
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}
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float norm = 1.0f / sumval;
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for (int i = 0; i <= own_pos; ++i) {
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out[x * T + i] *= norm;
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}
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}
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}
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#endif // __SOFTMAX_KERNEL_CUH__ |