vbatts/llama.cpp
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fix softmax

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luoyu-intel 2024-07-02 08:27:09 +00:00
parent e50517b64f
commit d70305b343
1 changed files with 16 additions and 4 deletions
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20
ggml/src/ggml-sycl/softmax.cpp
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@ -14,7 +14,9 @@ static void soft_max_f32(const float * x, const float * mask, float * dst, const
const int warp_id = item_ct1.get_local_id(2) / WARP_SIZE;
const int lane_id = item_ct1.get_local_id(2) % WARP_SIZE;
const int nthreads = block_size;
const int nwarps = nthreads / WARP_SIZE;
int nreduce = nwarps / WARP_SIZE;
float slope = 1.0f;
// ALiBi
@ -27,7 +29,7 @@ static void soft_max_f32(const float * x, const float * mask, float * dst, const
slope = sycl::pow(base, float(exp));
}
float * vals = vals_smem ? buf + WARP_SIZE : dst + rowx*ncols;
float *vals = vals_smem ? buf + std::max(nwarps, WARP_SIZE) : dst + rowx * ncols;
float max_val = -INFINITY;
for (int col0 = 0; col0 < ncols; col0 += block_size) {
@ -51,6 +53,8 @@ static void soft_max_f32(const float * x, const float * mask, float * dst, const
if (block_size > WARP_SIZE) {
if (warp_id == 0) {
buf[lane_id] = -INFINITY;
for (size_t i = 1; i < nreduce; i += 1)
buf[lane_id + i * WARP_SIZE] = -INFINITY;
}
item_ct1.barrier(sycl::access::fence_space::local_space);
@ -58,13 +62,15 @@ static void soft_max_f32(const float * x, const float * mask, float * dst, const
buf[warp_id] = max_val;
}
item_ct1.barrier(sycl::access::fence_space::local_space);
max_val = buf[lane_id];
for (size_t i = 1; i < nreduce; i += 1)
{
max_val = std::max(max_val, buf[lane_id + i * WARP_SIZE]);
}
max_val = warp_reduce_max(max_val, item_ct1);
}
float tmp = 0.f;
#pragma unroll
for (int col0 = 0; col0 < ncols; col0 += block_size) {
const int col = col0 + tid;
@ -83,6 +89,8 @@ static void soft_max_f32(const float * x, const float * mask, float * dst, const
item_ct1.barrier(sycl::access::fence_space::local_space);
if (warp_id == 0) {
buf[lane_id] = 0.f;
for (size_t i = 1; i < nreduce; i += 1)
buf[lane_id + i * WARP_SIZE] = 0.f;
}
item_ct1.barrier(sycl::access::fence_space::local_space);
@ -92,6 +100,10 @@ static void soft_max_f32(const float * x, const float * mask, float * dst, const
item_ct1.barrier(sycl::access::fence_space::local_space);
tmp = buf[lane_id];
for (size_t i = 1; i < nreduce; i += 1)
{
tmp += buf[lane_id + i * WARP_SIZE];
}
tmp = warp_reduce_sum(tmp, item_ct1);
}