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// Ported from ggml_compute_forward_norm_f32
// Dispatch [ ( ne01 + 31 ) / 32, ne02, ne03 ] thread groups of this shader
Buffer<float> arg0: register( t0 );
RWBuffer<float> result: register( u0 );
cbuffer Constants: register( b0 )
{
uint4 src0_elements: packoffset( c0 );
uint4 src0_strides: packoffset( c1 );
uint4 result_strides: packoffset( c3 );
}
static const double eps = 1e-5; // TODO: make this a parameter
#include "groupReduce.hlsli"
double computeVectorSum( uint i, const uint length )
{
double res = 0.0;
const uint iEnd = i + length;
for( ; i < iEnd; i++ )
res += arg0[ i ];
return res;
}
double offsetAndComputeSumSquares( uint rsi, uint rdi, const double mean, const uint length )
{
precise double sum2 = 0.0;
const uint rsiEnd = rsi + length;
for( ; rsi < rsiEnd; rsi++, rdi++ )
{
double v = arg0[ rsi ];
v -= mean;
result[ rdi ] = (float)v;
double prod = v * v;
sum2 += prod;
}
return sum2;
}
void scaleVector( uint rdi, const float scale, const uint length )
{
const uint rdiEnd = rdi + length;
for( ; rdi < rdiEnd; rdi++ )
{
float f = result[ rdi ];
f *= scale;
result[ rdi ] = f;
}
}
#include "fp64Utils.hlsli"
[ numthreads( 32, 1, 1 ) ]
void main( uint3 dtid: SV_DispatchThreadID )
{
const uint i03 = dtid.z;
const uint i02 = dtid.y;
const uint i01 = dtid.x;
if( i01 >= src0_elements[ 1 ] )
return;
const uint nb01 = src0_strides[ 1 ];
const uint nb02 = src0_strides[ 2 ];
const uint nb03 = src0_strides[ 3 ];
const uint p = i01 * nb01 + i02 * nb02 + i03 * nb03;
const uint ne00 = src0_elements[ 0 ];
double mean = computeVectorSum( p, ne00 );
mean = div64( mean, (double)(int)ne00 );
const uint nb1 = result_strides[ 1 ];
const uint nb2 = result_strides[ 2 ];
const uint nb3 = result_strides[ 3 ];
const uint y = i01 * nb1 + i02 * nb2 + i03 * nb3;
const double sum2 = offsetAndComputeSumSquares( p, y, mean, ne00 );
const float scale = (float)div64( 1.0, sqrt64( sum2 / (float)(int)ne00 + eps ) );
scaleVector( y, scale, ne00 );
}
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