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< a href = "kernels_2softmax_8h.html" > Go to the documentation of this file.< / a > < div class = "fragment" > < div class = "line" > < a id = "l00001" name = "l00001" > < / a > < span class = "lineno" > 1< / span > < span class = "comment" > // Copyright © 2023-2024 Apple Inc.< / span > < / div >
< div class = "line" > < a id = "l00002" name = "l00002" > < / a > < span class = "lineno" > 2< / span > < / div >
< div class = "line" > < a id = "l00003" name = "l00003" > < / a > < span class = "lineno" > 3< / span > < span class = "keyword" > template< / span > < < span class = "keyword" > typename< / span > T> < / div >
< div class = "foldopen" id = "foldopen00004" data-start = "{" data-end = "}" >
< div class = "line" > < a id = "l00004" name = "l00004" > < / a > < span class = "lineno" > < a class = "line" href = "kernels_2softmax_8h.html#a440d4031ee5e86159a4dd715e44a438b" > 4< / a > < / span > < span class = "keyword" > inline< / span > T < a class = "code hl_function" href = "kernels_2softmax_8h.html#a440d4031ee5e86159a4dd715e44a438b" > softmax_exp< / a > (T x) {< / div >
< div class = "line" > < a id = "l00005" name = "l00005" > < / a > < span class = "lineno" > 5< / span > < span class = "comment" > // Softmax doesn' t need high precision exponential cause x is gonna be in< / span > < / div >
< div class = "line" > < a id = "l00006" name = "l00006" > < / a > < span class = "lineno" > 6< / span > < span class = "comment" > // (-oo, 0] anyway and subsequently it will be divided by sum(exp(x_i)).< / span > < / div >
< div class = "line" > < a id = "l00007" name = "l00007" > < / a > < span class = "lineno" > 7< / span > < span class = "keywordflow" > return< / span > fast::exp(x);< / div >
< div class = "line" > < a id = "l00008" name = "l00008" > < / a > < span class = "lineno" > 8< / span > }< / div >
< / div >
< div class = "line" > < a id = "l00009" name = "l00009" > < / a > < span class = "lineno" > 9< / span > < / div >
< div class = "line" > < a id = "l00010" name = "l00010" > < / a > < span class = "lineno" > 10< / span > < span class = "keyword" > template< / span > < < span class = "keyword" > typename< / span > T, < span class = "keyword" > typename< / span > AccT = T, < span class = "keywordtype" > int< / span > N_READS = SOFTMAX_N_READS> < / div >
< div class = "foldopen" id = "foldopen00011" data-start = "{" data-end = "}" >
< div class = "line" > < a id = "l00011" name = "l00011" > < / a > < span class = "lineno" > < a class = "line" href = "kernels_2softmax_8h.html#a815fe70f879f318e5d6e99acf043f52b" > 11< / a > < / span > [[kernel]] < span class = "keywordtype" > void< / span > < a class = "code hl_function" href = "kernels_2softmax_8h.html#a815fe70f879f318e5d6e99acf043f52b" > softmax_single_row< / a > (< / div >
< div class = "line" > < a id = "l00012" name = "l00012" > < / a > < span class = "lineno" > 12< / span > < span class = "keyword" > const< / span > device T* in,< / div >
< div class = "line" > < a id = "l00013" name = "l00013" > < / a > < span class = "lineno" > 13< / span > device T* out,< / div >
< div class = "line" > < a id = "l00014" name = "l00014" > < / a > < span class = "lineno" > 14< / span > constant < span class = "keywordtype" > int< / span > & axis_size,< / div >
< div class = "line" > < a id = "l00015" name = "l00015" > < / a > < span class = "lineno" > 15< / span > uint gid [[threadgroup_position_in_grid]],< / div >
< div class = "line" > < a id = "l00016" name = "l00016" > < / a > < span class = "lineno" > 16< / span > uint _lid [[thread_position_in_threadgroup]],< / div >
< div class = "line" > < a id = "l00017" name = "l00017" > < / a > < span class = "lineno" > 17< / span > uint simd_lane_id [[thread_index_in_simdgroup]],< / div >
< div class = "line" > < a id = "l00018" name = "l00018" > < / a > < span class = "lineno" > 18< / span > uint simd_group_id [[simdgroup_index_in_threadgroup]]) {< / div >
< div class = "line" > < a id = "l00019" name = "l00019" > < / a > < span class = "lineno" > 19< / span > < span class = "keywordtype" > int< / span > lid = _lid;< / div >
< div class = "line" > < a id = "l00020" name = "l00020" > < / a > < span class = "lineno" > 20< / span > < / div >
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< div class = "line" > < a id = "l00021" name = "l00021" > < / a > < span class = "lineno" > 21< / span > < span class = "keyword" > constexpr< / span > < span class = "keywordtype" > int< / span > < a class = "code hl_variable" href = "quantized_8h.html#a62969a218d93680f5e35d0c61b160b99" > SIMD_SIZE< / a > = 32;< / div >
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< div class = "line" > < a id = "l00022" name = "l00022" > < / a > < span class = "lineno" > 22< / span > < / div >
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< div class = "line" > < a id = "l00023" name = "l00023" > < / a > < span class = "lineno" > 23< / span > threadgroup AccT local_max[< a class = "code hl_variable" href = "quantized_8h.html#a62969a218d93680f5e35d0c61b160b99" > SIMD_SIZE< / a > ];< / div >
< div class = "line" > < a id = "l00024" name = "l00024" > < / a > < span class = "lineno" > 24< / span > threadgroup AccT local_normalizer[< a class = "code hl_variable" href = "quantized_8h.html#a62969a218d93680f5e35d0c61b160b99" > SIMD_SIZE< / a > ];< / div >
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< div class = "line" > < a id = "l00025" name = "l00025" > < / a > < span class = "lineno" > 25< / span > < / div >
< div class = "line" > < a id = "l00026" name = "l00026" > < / a > < span class = "lineno" > 26< / span > AccT ld[N_READS];< / div >
< div class = "line" > < a id = "l00027" name = "l00027" > < / a > < span class = "lineno" > 27< / span > < / div >
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< div class = "line" > < a id = "l00028" name = "l00028" > < / a > < span class = "lineno" > 28< / span > in += gid * size_t(axis_size) + lid * N_READS;< / div >
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< div class = "line" > < a id = "l00029" name = "l00029" > < / a > < span class = "lineno" > 29< / span > < span class = "keywordflow" > if< / span > (lid * N_READS + N_READS < = axis_size) {< / div >
< div class = "line" > < a id = "l00030" name = "l00030" > < / a > < span class = "lineno" > 30< / span > < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = 0; i < N_READS; i++) {< / div >
< div class = "line" > < a id = "l00031" name = "l00031" > < / a > < span class = "lineno" > 31< / span > ld[i] = AccT(in[i]);< / div >
< div class = "line" > < a id = "l00032" name = "l00032" > < / a > < span class = "lineno" > 32< / span > }< / div >
< div class = "line" > < a id = "l00033" name = "l00033" > < / a > < span class = "lineno" > 33< / span > } < span class = "keywordflow" > else< / span > {< / div >
< div class = "line" > < a id = "l00034" name = "l00034" > < / a > < span class = "lineno" > 34< / span > < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = 0; i < N_READS; i++) {< / div >
< div class = "line" > < a id = "l00035" name = "l00035" > < / a > < span class = "lineno" > 35< / span > ld[i] = ((lid * N_READS + i) < axis_size) ? AccT(in[i])< / div >
< div class = "line" > < a id = "l00036" name = "l00036" > < / a > < span class = "lineno" > 36< / span > : < a class = "code hl_struct" href = "struct_limits.html" > Limits< AccT> ::finite_min< / a > ;< / div >
< div class = "line" > < a id = "l00037" name = "l00037" > < / a > < span class = "lineno" > 37< / span > }< / div >
< div class = "line" > < a id = "l00038" name = "l00038" > < / a > < span class = "lineno" > 38< / span > }< / div >
< div class = "line" > < a id = "l00039" name = "l00039" > < / a > < span class = "lineno" > 39< / span > < span class = "keywordflow" > if< / span > (simd_group_id == 0) {< / div >
< div class = "line" > < a id = "l00040" name = "l00040" > < / a > < span class = "lineno" > 40< / span > local_max[simd_lane_id] = < a class = "code hl_struct" href = "struct_limits.html" > Limits< AccT> ::finite_min< / a > ;< / div >
< div class = "line" > < a id = "l00041" name = "l00041" > < / a > < span class = "lineno" > 41< / span > local_normalizer[simd_lane_id] = 0;< / div >
< div class = "line" > < a id = "l00042" name = "l00042" > < / a > < span class = "lineno" > 42< / span > }< / div >
< div class = "line" > < a id = "l00043" name = "l00043" > < / a > < span class = "lineno" > 43< / span > threadgroup_barrier(mem_flags::mem_threadgroup);< / div >
< div class = "line" > < a id = "l00044" name = "l00044" > < / a > < span class = "lineno" > 44< / span > < / div >
< div class = "line" > < a id = "l00045" name = "l00045" > < / a > < span class = "lineno" > 45< / span > < span class = "comment" > // Get the max< / span > < / div >
< div class = "line" > < a id = "l00046" name = "l00046" > < / a > < span class = "lineno" > 46< / span > AccT maxval = < a class = "code hl_struct" href = "struct_limits.html" > Limits< AccT> ::finite_min< / a > ;< / div >
< div class = "line" > < a id = "l00047" name = "l00047" > < / a > < span class = "lineno" > 47< / span > < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = 0; i < N_READS; i++) {< / div >
< div class = "line" > < a id = "l00048" name = "l00048" > < / a > < span class = "lineno" > 48< / span > maxval = (maxval < ld[i]) ? ld[i] : maxval;< / div >
< div class = "line" > < a id = "l00049" name = "l00049" > < / a > < span class = "lineno" > 49< / span > }< / div >
< div class = "line" > < a id = "l00050" name = "l00050" > < / a > < span class = "lineno" > 50< / span > maxval = simd_max(maxval);< / div >
< div class = "line" > < a id = "l00051" name = "l00051" > < / a > < span class = "lineno" > 51< / span > < span class = "keywordflow" > if< / span > (simd_lane_id == 0) {< / div >
< div class = "line" > < a id = "l00052" name = "l00052" > < / a > < span class = "lineno" > 52< / span > local_max[simd_group_id] = maxval;< / div >
< div class = "line" > < a id = "l00053" name = "l00053" > < / a > < span class = "lineno" > 53< / span > }< / div >
< div class = "line" > < a id = "l00054" name = "l00054" > < / a > < span class = "lineno" > 54< / span > threadgroup_barrier(mem_flags::mem_threadgroup);< / div >
< div class = "line" > < a id = "l00055" name = "l00055" > < / a > < span class = "lineno" > 55< / span > < span class = "keywordflow" > if< / span > (simd_group_id == 0) {< / div >
< div class = "line" > < a id = "l00056" name = "l00056" > < / a > < span class = "lineno" > 56< / span > maxval = simd_max(local_max[simd_lane_id]);< / div >
< div class = "line" > < a id = "l00057" name = "l00057" > < / a > < span class = "lineno" > 57< / span > < span class = "keywordflow" > if< / span > (simd_lane_id == 0) {< / div >
< div class = "line" > < a id = "l00058" name = "l00058" > < / a > < span class = "lineno" > 58< / span > local_max[0] = maxval;< / div >
< div class = "line" > < a id = "l00059" name = "l00059" > < / a > < span class = "lineno" > 59< / span > }< / div >
< div class = "line" > < a id = "l00060" name = "l00060" > < / a > < span class = "lineno" > 60< / span > }< / div >
< div class = "line" > < a id = "l00061" name = "l00061" > < / a > < span class = "lineno" > 61< / span > threadgroup_barrier(mem_flags::mem_threadgroup);< / div >
< div class = "line" > < a id = "l00062" name = "l00062" > < / a > < span class = "lineno" > 62< / span > maxval = local_max[0];< / div >
< div class = "line" > < a id = "l00063" name = "l00063" > < / a > < span class = "lineno" > 63< / span > < / div >
< div class = "line" > < a id = "l00064" name = "l00064" > < / a > < span class = "lineno" > 64< / span > < span class = "comment" > // Compute exp(x_i - maxval) and store the partial sums in local_normalizer< / span > < / div >
< div class = "line" > < a id = "l00065" name = "l00065" > < / a > < span class = "lineno" > 65< / span > AccT normalizer = 0;< / div >
< div class = "line" > < a id = "l00066" name = "l00066" > < / a > < span class = "lineno" > 66< / span > < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = 0; i < N_READS; i++) {< / div >
< div class = "line" > < a id = "l00067" name = "l00067" > < / a > < span class = "lineno" > 67< / span > AccT exp_x = < a class = "code hl_function" href = "kernels_2softmax_8h.html#a440d4031ee5e86159a4dd715e44a438b" > softmax_exp< / a > (ld[i] - maxval);< / div >
< div class = "line" > < a id = "l00068" name = "l00068" > < / a > < span class = "lineno" > 68< / span > ld[i] = exp_x;< / div >
< div class = "line" > < a id = "l00069" name = "l00069" > < / a > < span class = "lineno" > 69< / span > normalizer += exp_x;< / div >
< div class = "line" > < a id = "l00070" name = "l00070" > < / a > < span class = "lineno" > 70< / span > }< / div >
< div class = "line" > < a id = "l00071" name = "l00071" > < / a > < span class = "lineno" > 71< / span > normalizer = simd_sum(normalizer);< / div >
< div class = "line" > < a id = "l00072" name = "l00072" > < / a > < span class = "lineno" > 72< / span > < span class = "keywordflow" > if< / span > (simd_lane_id == 0) {< / div >
< div class = "line" > < a id = "l00073" name = "l00073" > < / a > < span class = "lineno" > 73< / span > local_normalizer[simd_group_id] = normalizer;< / div >
< div class = "line" > < a id = "l00074" name = "l00074" > < / a > < span class = "lineno" > 74< / span > }< / div >
< div class = "line" > < a id = "l00075" name = "l00075" > < / a > < span class = "lineno" > 75< / span > threadgroup_barrier(mem_flags::mem_threadgroup);< / div >
< div class = "line" > < a id = "l00076" name = "l00076" > < / a > < span class = "lineno" > 76< / span > < span class = "keywordflow" > if< / span > (simd_group_id == 0) {< / div >
< div class = "line" > < a id = "l00077" name = "l00077" > < / a > < span class = "lineno" > 77< / span > normalizer = simd_sum(local_normalizer[simd_lane_id]);< / div >
< div class = "line" > < a id = "l00078" name = "l00078" > < / a > < span class = "lineno" > 78< / span > < span class = "keywordflow" > if< / span > (simd_lane_id == 0) {< / div >
< div class = "line" > < a id = "l00079" name = "l00079" > < / a > < span class = "lineno" > 79< / span > local_normalizer[0] = normalizer;< / div >
< div class = "line" > < a id = "l00080" name = "l00080" > < / a > < span class = "lineno" > 80< / span > }< / div >
< div class = "line" > < a id = "l00081" name = "l00081" > < / a > < span class = "lineno" > 81< / span > }< / div >
< div class = "line" > < a id = "l00082" name = "l00082" > < / a > < span class = "lineno" > 82< / span > threadgroup_barrier(mem_flags::mem_threadgroup);< / div >
< div class = "line" > < a id = "l00083" name = "l00083" > < / a > < span class = "lineno" > 83< / span > normalizer = 1 / local_normalizer[0];< / div >
< div class = "line" > < a id = "l00084" name = "l00084" > < / a > < span class = "lineno" > 84< / span > < / div >
< div class = "line" > < a id = "l00085" name = "l00085" > < / a > < span class = "lineno" > 85< / span > < span class = "comment" > // Normalize and write to the output< / span > < / div >
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< div class = "line" > < a id = "l00086" name = "l00086" > < / a > < span class = "lineno" > 86< / span > out += gid * size_t(axis_size) + lid * N_READS;< / div >
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< div class = "line" > < a id = "l00087" name = "l00087" > < / a > < span class = "lineno" > 87< / span > < span class = "keywordflow" > if< / span > (lid * N_READS + N_READS < = axis_size) {< / div >
< div class = "line" > < a id = "l00088" name = "l00088" > < / a > < span class = "lineno" > 88< / span > < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = 0; i < N_READS; i++) {< / div >
< div class = "line" > < a id = "l00089" name = "l00089" > < / a > < span class = "lineno" > 89< / span > out[i] = T(ld[i] * normalizer);< / div >
< div class = "line" > < a id = "l00090" name = "l00090" > < / a > < span class = "lineno" > 90< / span > }< / div >
< div class = "line" > < a id = "l00091" name = "l00091" > < / a > < span class = "lineno" > 91< / span > } < span class = "keywordflow" > else< / span > {< / div >
< div class = "line" > < a id = "l00092" name = "l00092" > < / a > < span class = "lineno" > 92< / span > < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = 0; i < N_READS; i++) {< / div >
< div class = "line" > < a id = "l00093" name = "l00093" > < / a > < span class = "lineno" > 93< / span > < span class = "keywordflow" > if< / span > ((lid * N_READS + i) < axis_size) {< / div >
< div class = "line" > < a id = "l00094" name = "l00094" > < / a > < span class = "lineno" > 94< / span > out[i] = T(ld[i] * normalizer);< / div >
< div class = "line" > < a id = "l00095" name = "l00095" > < / a > < span class = "lineno" > 95< / span > }< / div >
< div class = "line" > < a id = "l00096" name = "l00096" > < / a > < span class = "lineno" > 96< / span > }< / div >
< div class = "line" > < a id = "l00097" name = "l00097" > < / a > < span class = "lineno" > 97< / span > }< / div >
< div class = "line" > < a id = "l00098" name = "l00098" > < / a > < span class = "lineno" > 98< / span > }< / div >
< / div >
< div class = "line" > < a id = "l00099" name = "l00099" > < / a > < span class = "lineno" > 99< / span > < / div >
< div class = "line" > < a id = "l00100" name = "l00100" > < / a > < span class = "lineno" > 100< / span > < span class = "keyword" > template< / span > < < span class = "keyword" > typename< / span > T, < span class = "keyword" > typename< / span > AccT = T, < span class = "keywordtype" > int< / span > N_READS = SOFTMAX_N_READS> < / div >
< div class = "foldopen" id = "foldopen00101" data-start = "{" data-end = "}" >
< div class = "line" > < a id = "l00101" name = "l00101" > < / a > < span class = "lineno" > < a class = "line" href = "kernels_2softmax_8h.html#a8c47b0924ebfeebcca25f3dd17373276" > 101< / a > < / span > [[kernel]] < span class = "keywordtype" > void< / span > < a class = "code hl_function" href = "kernels_2softmax_8h.html#a8c47b0924ebfeebcca25f3dd17373276" > softmax_looped< / a > (< / div >
< div class = "line" > < a id = "l00102" name = "l00102" > < / a > < span class = "lineno" > 102< / span > < span class = "keyword" > const< / span > device T* in,< / div >
< div class = "line" > < a id = "l00103" name = "l00103" > < / a > < span class = "lineno" > 103< / span > device T* out,< / div >
< div class = "line" > < a id = "l00104" name = "l00104" > < / a > < span class = "lineno" > 104< / span > constant < span class = "keywordtype" > int< / span > & axis_size,< / div >
< div class = "line" > < a id = "l00105" name = "l00105" > < / a > < span class = "lineno" > 105< / span > uint gid [[threadgroup_position_in_grid]],< / div >
< div class = "line" > < a id = "l00106" name = "l00106" > < / a > < span class = "lineno" > 106< / span > uint lid [[thread_position_in_threadgroup]],< / div >
< div class = "line" > < a id = "l00107" name = "l00107" > < / a > < span class = "lineno" > 107< / span > uint lsize [[threads_per_threadgroup]],< / div >
< div class = "line" > < a id = "l00108" name = "l00108" > < / a > < span class = "lineno" > 108< / span > uint simd_lane_id [[thread_index_in_simdgroup]],< / div >
< div class = "line" > < a id = "l00109" name = "l00109" > < / a > < span class = "lineno" > 109< / span > uint simd_group_id [[simdgroup_index_in_threadgroup]]) {< / div >
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< div class = "line" > < a id = "l00110" name = "l00110" > < / a > < span class = "lineno" > 110< / span > in += gid * size_t(axis_size);< / div >
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< div class = "line" > < a id = "l00111" name = "l00111" > < / a > < span class = "lineno" > 111< / span > < / div >
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< div class = "line" > < a id = "l00112" name = "l00112" > < / a > < span class = "lineno" > 112< / span > < span class = "keyword" > constexpr< / span > < span class = "keywordtype" > int< / span > < a class = "code hl_variable" href = "quantized_8h.html#a62969a218d93680f5e35d0c61b160b99" > SIMD_SIZE< / a > = 32;< / div >
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< div class = "line" > < a id = "l00113" name = "l00113" > < / a > < span class = "lineno" > 113< / span > < / div >
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< div class = "line" > < a id = "l00114" name = "l00114" > < / a > < span class = "lineno" > 114< / span > threadgroup AccT local_max[< a class = "code hl_variable" href = "quantized_8h.html#a62969a218d93680f5e35d0c61b160b99" > SIMD_SIZE< / a > ];< / div >
< div class = "line" > < a id = "l00115" name = "l00115" > < / a > < span class = "lineno" > 115< / span > threadgroup AccT local_normalizer[< a class = "code hl_variable" href = "quantized_8h.html#a62969a218d93680f5e35d0c61b160b99" > SIMD_SIZE< / a > ];< / div >
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< div class = "line" > < a id = "l00116" name = "l00116" > < / a > < span class = "lineno" > 116< / span > < / div >
< div class = "line" > < a id = "l00117" name = "l00117" > < / a > < span class = "lineno" > 117< / span > < span class = "comment" > // Get the max and the normalizer in one go< / span > < / div >
< div class = "line" > < a id = "l00118" name = "l00118" > < / a > < span class = "lineno" > 118< / span > AccT prevmax;< / div >
< div class = "line" > < a id = "l00119" name = "l00119" > < / a > < span class = "lineno" > 119< / span > AccT maxval = < a class = "code hl_struct" href = "struct_limits.html" > Limits< AccT> ::finite_min< / a > ;< / div >
< div class = "line" > < a id = "l00120" name = "l00120" > < / a > < span class = "lineno" > 120< / span > AccT normalizer = 0;< / div >
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< div class = "line" > < a id = "l00121" name = "l00121" > < / a > < span class = "lineno" > 121< / span > < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > r = 0; r < static_cast< int> (< a class = "code hl_function" href = "backend_2metal_2kernels_2utils_8h.html#a8e5a4b0fb5d018d7b078d147efe4f1e3" > ceildiv< / a > (axis_size, N_READS * lsize));< / div >
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< div class = "line" > < a id = "l00122" name = "l00122" > < / a > < span class = "lineno" > 122< / span > r++) {< / div >
< div class = "line" > < a id = "l00123" name = "l00123" > < / a > < span class = "lineno" > 123< / span > < span class = "keywordtype" > int< / span > offset = r * lsize * N_READS + lid * N_READS;< / div >
< div class = "line" > < a id = "l00124" name = "l00124" > < / a > < span class = "lineno" > 124< / span > AccT vals[N_READS];< / div >
< div class = "line" > < a id = "l00125" name = "l00125" > < / a > < span class = "lineno" > 125< / span > < span class = "keywordflow" > if< / span > (offset + N_READS < = axis_size) {< / div >
< div class = "line" > < a id = "l00126" name = "l00126" > < / a > < span class = "lineno" > 126< / span > < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = 0; i < N_READS; i++) {< / div >
< div class = "line" > < a id = "l00127" name = "l00127" > < / a > < span class = "lineno" > 127< / span > vals[i] = AccT(in[offset + i]);< / div >
< div class = "line" > < a id = "l00128" name = "l00128" > < / a > < span class = "lineno" > 128< / span > }< / div >
< div class = "line" > < a id = "l00129" name = "l00129" > < / a > < span class = "lineno" > 129< / span > } < span class = "keywordflow" > else< / span > {< / div >
< div class = "line" > < a id = "l00130" name = "l00130" > < / a > < span class = "lineno" > 130< / span > < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = 0; i < N_READS; i++) {< / div >
< div class = "line" > < a id = "l00131" name = "l00131" > < / a > < span class = "lineno" > 131< / span > vals[i] = (offset + i < axis_size) ? AccT(in[offset + i])< / div >
< div class = "line" > < a id = "l00132" name = "l00132" > < / a > < span class = "lineno" > 132< / span > : < a class = "code hl_struct" href = "struct_limits.html" > Limits< AccT> ::finite_min< / a > ;< / div >
< div class = "line" > < a id = "l00133" name = "l00133" > < / a > < span class = "lineno" > 133< / span > }< / div >
< div class = "line" > < a id = "l00134" name = "l00134" > < / a > < span class = "lineno" > 134< / span > }< / div >
< div class = "line" > < a id = "l00135" name = "l00135" > < / a > < span class = "lineno" > 135< / span > prevmax = maxval;< / div >
< div class = "line" > < a id = "l00136" name = "l00136" > < / a > < span class = "lineno" > 136< / span > < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = 0; i < N_READS; i++) {< / div >
< div class = "line" > < a id = "l00137" name = "l00137" > < / a > < span class = "lineno" > 137< / span > maxval = (maxval < vals[i]) ? vals[i] : maxval;< / div >
< div class = "line" > < a id = "l00138" name = "l00138" > < / a > < span class = "lineno" > 138< / span > }< / div >
< div class = "line" > < a id = "l00139" name = "l00139" > < / a > < span class = "lineno" > 139< / span > normalizer *= < a class = "code hl_function" href = "kernels_2softmax_8h.html#a440d4031ee5e86159a4dd715e44a438b" > softmax_exp< / a > (prevmax - maxval);< / div >
< div class = "line" > < a id = "l00140" name = "l00140" > < / a > < span class = "lineno" > 140< / span > < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = 0; i < N_READS; i++) {< / div >
< div class = "line" > < a id = "l00141" name = "l00141" > < / a > < span class = "lineno" > 141< / span > normalizer += < a class = "code hl_function" href = "kernels_2softmax_8h.html#a440d4031ee5e86159a4dd715e44a438b" > softmax_exp< / a > (vals[i] - maxval);< / div >
< div class = "line" > < a id = "l00142" name = "l00142" > < / a > < span class = "lineno" > 142< / span > }< / div >
< div class = "line" > < a id = "l00143" name = "l00143" > < / a > < span class = "lineno" > 143< / span > }< / div >
< div class = "line" > < a id = "l00144" name = "l00144" > < / a > < span class = "lineno" > 144< / span > < span class = "comment" > // Now we got partial normalizer of N_READS * ceildiv(axis_size, N_READS *< / span > < / div >
< div class = "line" > < a id = "l00145" name = "l00145" > < / a > < span class = "lineno" > 145< / span > < span class = "comment" > // lsize) parts. We need to combine them.< / span > < / div >
< div class = "line" > < a id = "l00146" name = "l00146" > < / a > < span class = "lineno" > 146< / span > < span class = "comment" > // 1. We start by finding the max across simd groups< / span > < / div >
< div class = "line" > < a id = "l00147" name = "l00147" > < / a > < span class = "lineno" > 147< / span > < span class = "comment" > // 2. We then change the partial normalizers to account for a possible< / span > < / div >
< div class = "line" > < a id = "l00148" name = "l00148" > < / a > < span class = "lineno" > 148< / span > < span class = "comment" > // change in max< / span > < / div >
< div class = "line" > < a id = "l00149" name = "l00149" > < / a > < span class = "lineno" > 149< / span > < span class = "comment" > // 3. We sum all normalizers< / span > < / div >
< div class = "line" > < a id = "l00150" name = "l00150" > < / a > < span class = "lineno" > 150< / span > prevmax = maxval;< / div >
< div class = "line" > < a id = "l00151" name = "l00151" > < / a > < span class = "lineno" > 151< / span > maxval = simd_max(maxval);< / div >
< div class = "line" > < a id = "l00152" name = "l00152" > < / a > < span class = "lineno" > 152< / span > normalizer *= < a class = "code hl_function" href = "kernels_2softmax_8h.html#a440d4031ee5e86159a4dd715e44a438b" > softmax_exp< / a > (prevmax - maxval);< / div >
< div class = "line" > < a id = "l00153" name = "l00153" > < / a > < span class = "lineno" > 153< / span > normalizer = simd_sum(normalizer);< / div >
< div class = "line" > < a id = "l00154" name = "l00154" > < / a > < span class = "lineno" > 154< / span > < / div >
< div class = "line" > < a id = "l00155" name = "l00155" > < / a > < span class = "lineno" > 155< / span > < span class = "comment" > // Now the normalizer and max value is correct for each simdgroup. We write< / span > < / div >
< div class = "line" > < a id = "l00156" name = "l00156" > < / a > < span class = "lineno" > 156< / span > < span class = "comment" > // them shared memory and combine them.< / span > < / div >
< div class = "line" > < a id = "l00157" name = "l00157" > < / a > < span class = "lineno" > 157< / span > prevmax = maxval;< / div >
< div class = "line" > < a id = "l00158" name = "l00158" > < / a > < span class = "lineno" > 158< / span > < span class = "keywordflow" > if< / span > (simd_lane_id == 0) {< / div >
< div class = "line" > < a id = "l00159" name = "l00159" > < / a > < span class = "lineno" > 159< / span > local_max[simd_group_id] = maxval;< / div >
< div class = "line" > < a id = "l00160" name = "l00160" > < / a > < span class = "lineno" > 160< / span > }< / div >
< div class = "line" > < a id = "l00161" name = "l00161" > < / a > < span class = "lineno" > 161< / span > threadgroup_barrier(mem_flags::mem_threadgroup);< / div >
< div class = "line" > < a id = "l00162" name = "l00162" > < / a > < span class = "lineno" > 162< / span > maxval = simd_max(local_max[simd_lane_id]);< / div >
< div class = "line" > < a id = "l00163" name = "l00163" > < / a > < span class = "lineno" > 163< / span > normalizer *= < a class = "code hl_function" href = "kernels_2softmax_8h.html#a440d4031ee5e86159a4dd715e44a438b" > softmax_exp< / a > (prevmax - maxval);< / div >
< div class = "line" > < a id = "l00164" name = "l00164" > < / a > < span class = "lineno" > 164< / span > < span class = "keywordflow" > if< / span > (simd_lane_id == 0) {< / div >
< div class = "line" > < a id = "l00165" name = "l00165" > < / a > < span class = "lineno" > 165< / span > local_normalizer[simd_group_id] = normalizer;< / div >
< div class = "line" > < a id = "l00166" name = "l00166" > < / a > < span class = "lineno" > 166< / span > }< / div >
< div class = "line" > < a id = "l00167" name = "l00167" > < / a > < span class = "lineno" > 167< / span > threadgroup_barrier(mem_flags::mem_threadgroup);< / div >
< div class = "line" > < a id = "l00168" name = "l00168" > < / a > < span class = "lineno" > 168< / span > normalizer = simd_sum(local_normalizer[simd_lane_id]);< / div >
< div class = "line" > < a id = "l00169" name = "l00169" > < / a > < span class = "lineno" > 169< / span > normalizer = 1 / normalizer;< / div >
< div class = "line" > < a id = "l00170" name = "l00170" > < / a > < span class = "lineno" > 170< / span > < / div >
< div class = "line" > < a id = "l00171" name = "l00171" > < / a > < span class = "lineno" > 171< / span > < span class = "comment" > // Finally given the normalizer and max value we can directly write the< / span > < / div >
< div class = "line" > < a id = "l00172" name = "l00172" > < / a > < span class = "lineno" > 172< / span > < span class = "comment" > // softmax output< / span > < / div >
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< div class = "line" > < a id = "l00173" name = "l00173" > < / a > < span class = "lineno" > 173< / span > out += gid * size_t(axis_size);< / div >
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< div class = "line" > < a id = "l00174" name = "l00174" > < / a > < span class = "lineno" > 174< / span > < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > r = 0; r < static_cast< int> (< a class = "code hl_function" href = "backend_2metal_2kernels_2utils_8h.html#a8e5a4b0fb5d018d7b078d147efe4f1e3" > ceildiv< / a > (axis_size, N_READS * lsize));< / div >
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< div class = "line" > < a id = "l00175" name = "l00175" > < / a > < span class = "lineno" > 175< / span > r++) {< / div >
< div class = "line" > < a id = "l00176" name = "l00176" > < / a > < span class = "lineno" > 176< / span > < span class = "keywordtype" > int< / span > offset = r * lsize * N_READS + lid * N_READS;< / div >
< div class = "line" > < a id = "l00177" name = "l00177" > < / a > < span class = "lineno" > 177< / span > < span class = "keywordflow" > if< / span > (offset + N_READS < = axis_size) {< / div >
< div class = "line" > < a id = "l00178" name = "l00178" > < / a > < span class = "lineno" > 178< / span > < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = 0; i < N_READS; i++) {< / div >
< div class = "line" > < a id = "l00179" name = "l00179" > < / a > < span class = "lineno" > 179< / span > out[offset + i] = T(< a class = "code hl_function" href = "kernels_2softmax_8h.html#a440d4031ee5e86159a4dd715e44a438b" > softmax_exp< / a > (in[offset + i] - maxval) * normalizer);< / div >
< div class = "line" > < a id = "l00180" name = "l00180" > < / a > < span class = "lineno" > 180< / span > }< / div >
< div class = "line" > < a id = "l00181" name = "l00181" > < / a > < span class = "lineno" > 181< / span > } < span class = "keywordflow" > else< / span > {< / div >
< div class = "line" > < a id = "l00182" name = "l00182" > < / a > < span class = "lineno" > 182< / span > < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > int< / span > i = 0; i < N_READS; i++) {< / div >
< div class = "line" > < a id = "l00183" name = "l00183" > < / a > < span class = "lineno" > 183< / span > < span class = "keywordflow" > if< / span > (offset + i < axis_size) {< / div >
< div class = "line" > < a id = "l00184" name = "l00184" > < / a > < span class = "lineno" > 184< / span > out[offset + i] =< / div >
< div class = "line" > < a id = "l00185" name = "l00185" > < / a > < span class = "lineno" > 185< / span > T(< a class = "code hl_function" href = "kernels_2softmax_8h.html#a440d4031ee5e86159a4dd715e44a438b" > softmax_exp< / a > (in[offset + i] - maxval) * normalizer);< / div >
< div class = "line" > < a id = "l00186" name = "l00186" > < / a > < span class = "lineno" > 186< / span > }< / div >
< div class = "line" > < a id = "l00187" name = "l00187" > < / a > < span class = "lineno" > 187< / span > }< / div >
< div class = "line" > < a id = "l00188" name = "l00188" > < / a > < span class = "lineno" > 188< / span > }< / div >
< div class = "line" > < a id = "l00189" name = "l00189" > < / a > < span class = "lineno" > 189< / span > }< / div >
< div class = "line" > < a id = "l00190" name = "l00190" > < / a > < span class = "lineno" > 190< / span > }< / div >
< / div >
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< div class = "ttc" id = "abackend_2metal_2kernels_2utils_8h_html_a8e5a4b0fb5d018d7b078d147efe4f1e3" > < div class = "ttname" > < a href = "backend_2metal_2kernels_2utils_8h.html#a8e5a4b0fb5d018d7b078d147efe4f1e3" > ceildiv< / a > < / div > < div class = "ttdeci" > T ceildiv(T N, U M)< / div > < div class = "ttdoc" > Compute ceil((float)N/(float)M)< / div > < div class = "ttdef" > < b > Definition< / b > utils.h:409< / div > < / div >
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< div class = "ttc" id = "akernels_2softmax_8h_html_a440d4031ee5e86159a4dd715e44a438b" > < div class = "ttname" > < a href = "kernels_2softmax_8h.html#a440d4031ee5e86159a4dd715e44a438b" > softmax_exp< / a > < / div > < div class = "ttdeci" > T softmax_exp(T x)< / div > < div class = "ttdef" > < b > Definition< / b > softmax.h:4< / div > < / div >
< div class = "ttc" id = "akernels_2softmax_8h_html_a815fe70f879f318e5d6e99acf043f52b" > < div class = "ttname" > < a href = "kernels_2softmax_8h.html#a815fe70f879f318e5d6e99acf043f52b" > softmax_single_row< / a > < / div > < div class = "ttdeci" > void softmax_single_row(const device T *in, device T *out, constant int & axis_size, uint gid, uint _lid, uint simd_lane_id, uint simd_group_id)< / div > < div class = "ttdef" > < b > Definition< / b > softmax.h:11< / div > < / div >
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2024-07-12 06:32:08 +08:00
< div class = "ttc" id = "aquantized_8h_html_a62969a218d93680f5e35d0c61b160b99" > < div class = "ttname" > < a href = "quantized_8h.html#a62969a218d93680f5e35d0c61b160b99" > SIMD_SIZE< / a > < / div > < div class = "ttdeci" > static constant constexpr const int SIMD_SIZE< / div > < div class = "ttdef" > < b > Definition< / b > quantized.h:10< / div > < / div >
2024-06-07 11:28:06 +08:00
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