chatglm-6b-int4 / quantization_kernels.c
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void compress_int4_weight(void *weight, void *out, int n, int m)
{
for(int i=0;i<n*m;i++)
{
(*(unsigned char*)(out)) = ((*(unsigned char*)(weight)) << 4);
weight += sizeof(char);
(*(unsigned char*)(out)) |= ((*(unsigned char*)(weight)) & 15);
weight += sizeof(char);
out += sizeof(char);
}
}
void extract_int8_weight_to_float(void *weight, void *scale_list, void *out, int n, int m)
{
for(int i=0;i<n;i++)
for(int j=0;j<m;j++)
(*(float*)(out + sizeof(float) * (i * m + j))) = (*(float*)(scale_list + sizeof(float) * i)) * (*(char*)(weight + sizeof(char) * (i * m + j)));
}
void extract_int4_weight_to_float(void *weight, void *scale_list, void *out, int n, int m)
{
for(int i=0;i<n;i++)
{
for(int j=0;j<m;j++)
{
(*(float*)(out)) = (*(float*)(scale_list)) * ((*(char*)(weight)) >> 4);
out += sizeof(float);
(*(float*)(out)) = (*(float*)(scale_list)) * (((char)((*(unsigned char*)(weight)) << 4))>> 4);
out += sizeof(float);
weight += sizeof(char);
}
scale_list += sizeof(float);
}
}