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metal : handle F16 inf values, fix FA partial offload (#7434)

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ggml-ci
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Georgi Gerganov 2024-05-21 23:03:42 +03:00 committed by GitHub
parent e402de364b
commit 6369bf0433
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1 changed files with 12 additions and 15 deletions
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@ -2204,11 +2204,7 @@ kernel void kernel_flash_attn_ext_f16(
// pointer to the mask
device const half * mp = (device const half *) (mask + iq1*nb31);
// prepare diagonal scale matrix
simdgroup_float8x8 mscale(scale);
// prepare diagonal slope matrix
simdgroup_float8x8 mslope(1.0f);
float slope = 1.0f;
// ALiBi
if (max_bias > 0.0f) {
@ -2217,7 +2213,7 @@ kernel void kernel_flash_attn_ext_f16(
const float base = h < n_head_log2 ? m0 : m1;
const int exph = h < n_head_log2 ? h + 1 : 2*(h - n_head_log2) + 1;
mslope = simdgroup_float8x8(pow(base, exph));
slope = pow(base, exph);
}
// loop over the KV cache
@ -2242,18 +2238,20 @@ kernel void kernel_flash_attn_ext_f16(
simdgroup_multiply_accumulate(mqk, mq[i], mk, mqk);
}
simdgroup_store(mqk, ss + 8*cc, TF, 0, false);
const short tx = tiisg%4;
const short ty = tiisg/4;
if (mask != q) {
// mqk = mqk*scale + mask*slope
simdgroup_half8x8 mm;
simdgroup_load(mm, mp + ic + 8*cc, nb31/sizeof(half), 0, false);
simdgroup_multiply(mm, mslope, mm);
simdgroup_multiply_accumulate(mqk, mqk, mscale, mm);
ss[8*cc + ty*TF + 2*tx + 0] = scale*ss[8*cc + ty*TF + 2*tx + 0] + slope*mp[ic + 8*cc + ty*nb31/sizeof(half) + 2*tx + 0];
ss[8*cc + ty*TF + 2*tx + 1] = scale*ss[8*cc + ty*TF + 2*tx + 1] + slope*mp[ic + 8*cc + ty*nb31/sizeof(half) + 2*tx + 1];
} else {
// mqk = mqk*scale
simdgroup_multiply(mqk, mscale, mqk);
ss[8*cc + ty*TF + 2*tx + 0] *= scale;
ss[8*cc + ty*TF + 2*tx + 1] *= scale;
}
simdgroup_store(mqk, ss + 8*cc, TF, 0, false);
}
}
@ -2816,8 +2814,7 @@ kernel void kernel_cpy_f32_f16(
for (int64_t i00 = tpitg.x; i00 < ne00; i00 += ntg.x) {
device const float * src = (device float *)((device char *) src0 + i03*nb03 + i02*nb02 + i01*nb01 + i00*nb00);
// TODO: is there a better way to handle -INFINITY?
dst_data[i00] = src[0] == -INFINITY ? -MAXHALF : src[0];
dst_data[i00] = src[0];
}
}