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Bugfix for dequantizing q5k layers. (#1569)

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This commit is contained in:
Laurent Mazare
2024-01-11 23:15:11 +01:00
committed by GitHub
parent c1876b8041
commit 41915184bb
2 changed files with 5 additions and 5 deletions
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8
candle-core/src/quantized/k_quants.rs
View File

@ -1545,13 +1545,13 @@ impl GgmlType for BlockQ5K {
let d2 = d * sc as f32;
let m2 = min * m as f32;
for (ql, qh) in ql.iter().zip(qh) {
let to_add = if qh & u1 != 0 { 16 } else { 1 };
y[ys_index] = d1 * ((ql & 0xF) + to_add) as f32 - m1;
let to_add = if qh & u1 != 0 { 16f32 } else { 0f32 };
y[ys_index] = d1 * ((ql & 0xF) as f32 + to_add) - m1;
ys_index += 1;
}
for (ql, qh) in ql.iter().zip(qh) {
let to_add = if qh & u2 != 0 { 16 } else { 1 };
y[ys_index] = d2 * ((ql >> 4) + to_add) as f32 - m2;
let to_add = if qh & u2 != 0 { 16f32 } else { 0f32 };
y[ys_index] = d2 * ((ql >> 4) as f32 + to_add) - m2;
ys_index += 1;
}
is += 2;

2
candle-core/tests/quantized_tests.rs
View File

@ -407,7 +407,7 @@ fn quantize_q5k() -> Result<()> {
let dst = round_vector(&dst);
assert_eq!(
[dst[0], dst[128], dst[256], dst[512], dst[800], dst[1023]],
[-0.499, -0.372, -0.249, 0.001, 0.279, 0.499]
[-0.5, -0.373, -0.25, 0.0, 0.279, 0.499]
);
let (src_big, mut dst_big) = get_test_vector(128.0, 1024);