Split out the quantized file. (#456)

candle-core/src/quantized/k_quants.rs

@@ -0,0 +1,728 @@
+use super::GgmlDType;
+use crate::Result;
+use half::f16;
+
+// Default to QK_K 256 rather than 64.
+pub const QK_K: usize = 256;
+pub const K_SCALE_SIZE: usize = 12;
+
+pub const QK4_0: usize = 32;
+pub const QK4_1: usize = 32;
+pub const QK5_0: usize = 32;
+pub const QK5_1: usize = 32;
+pub const QK8_0: usize = 32;
+pub const QK8_1: usize = 32;
+
+pub trait GgmlType: Sized + Clone {
+    const DTYPE: GgmlDType;
+    const BLCK_SIZE: usize;
+    type VecDotType: GgmlType;
+
+    // This is only safe for types that include immediate values such as float/int/...
+    fn zeros() -> Self {
+        unsafe { std::mem::MaybeUninit::zeroed().assume_init() }
+    }
+    fn to_float(xs: &[Self], ys: &mut [f32]) -> Result<()>;
+    fn from_float(xs: &[f32], ys: &mut [Self]) -> Result<()>;
+
+    /// Dot product used as a building block for quantized mat-mul.
+    /// n is the number of elements to be considered.
+    fn vec_dot(n: usize, xs: &[Self], ys: &[Self::VecDotType]) -> Result<f32>;
+}
+
+#[derive(Debug, Clone, PartialEq)]
+#[repr(C)]
+pub struct BlockQ4_0 {
+    d: f16,
+    qs: [u8; QK4_0 / 2],
+}
+const _: () = assert!(std::mem::size_of::<BlockQ4_0>() == 18);
+
+#[derive(Debug, Clone, PartialEq)]
+#[repr(C)]
+pub struct BlockQ4_1 {
+    d: f16,
+    m: f16,
+    qs: [u8; QK4_1 / 2],
+}
+const _: () = assert!(std::mem::size_of::<BlockQ4_1>() == 20);
+
+#[derive(Debug, Clone, PartialEq)]
+#[repr(C)]
+pub struct BlockQ5_0 {
+    d: f16,
+    qh: [u8; 4],
+    qs: [u8; QK5_0 / 2],
+}
+const _: () = assert!(std::mem::size_of::<BlockQ5_0>() == 22);
+
+#[derive(Debug, Clone, PartialEq)]
+#[repr(C)]
+pub struct BlockQ5_1 {
+    d: f16,
+    m: f16,
+    qh: [u8; 4],
+    qs: [u8; QK5_1 / 2],
+}
+const _: () = assert!(std::mem::size_of::<BlockQ5_1>() == 24);
+
+#[derive(Debug, Clone, PartialEq)]
+#[repr(C)]
+pub struct BlockQ8_0 {
+    d: f16,
+    qs: [u8; QK8_0],
+}
+const _: () = assert!(std::mem::size_of::<BlockQ8_0>() == 34);
+
+#[derive(Debug, Clone, PartialEq)]
+#[repr(C)]
+pub struct BlockQ8_1 {
+    d: f16,
+    s: f16,
+    qs: [u8; QK8_1],
+}
+const _: () = assert!(std::mem::size_of::<BlockQ8_1>() == 36);
+
+#[derive(Debug, Clone, PartialEq)]
+#[repr(C)]
+pub struct BlockQ2K {
+    scales: [u8; QK_K / 16],
+    qs: [u8; QK_K / 4],
+    d: f16,
+    dmin: f16,
+}
+const _: () = assert!(QK_K / 16 + QK_K / 4 + 2 * 2 == std::mem::size_of::<BlockQ2K>());
+
+#[derive(Debug, Clone, PartialEq)]
+#[repr(C)]
+pub struct BlockQ3K {
+    hmask: [u8; QK_K / 8],
+    qs: [u8; QK_K / 4],
+    scales: [u8; 12],
+    d: f16,
+}
+const _: () = assert!(QK_K / 8 + QK_K / 4 + 12 + 2 == std::mem::size_of::<BlockQ3K>());
+
+#[derive(Debug, Clone, PartialEq)]
+// https://github.com/ggerganov/llama.cpp/blob/468ea24fb4633a0d681f7ac84089566c1c6190cb/k_quants.h#L82
+#[repr(C)]
+pub struct BlockQ4K {
+    d: f16,
+    dmin: f16,
+    scales: [u8; K_SCALE_SIZE],
+    qs: [u8; QK_K / 2],
+}
+const _: () = assert!(QK_K / 2 + K_SCALE_SIZE + 2 * 2 == std::mem::size_of::<BlockQ4K>());
+
+#[derive(Debug, Clone, PartialEq)]
+#[repr(C)]
+pub struct BlockQ5K {
+    d: f16,
+    dmin: f16,
+    scales: [u8; K_SCALE_SIZE],
+    qh: [u8; QK_K / 8],
+    qs: [u8; QK_K / 2],
+}
+const _: () =
+    assert!(QK_K / 8 + QK_K / 2 + 2 * 2 + K_SCALE_SIZE == std::mem::size_of::<BlockQ5K>());
+
+#[derive(Debug, Clone, PartialEq)]
+#[repr(C)]
+pub struct BlockQ6K {
+    ql: [u8; QK_K / 2],
+    qh: [u8; QK_K / 4],
+    scales: [i8; QK_K / 16],
+    d: f16,
+}
+const _: () = assert!(3 * QK_K / 4 + QK_K / 16 + 2 == std::mem::size_of::<BlockQ6K>());
+
+#[derive(Debug, Clone, PartialEq)]
+#[repr(C)]
+pub struct BlockQ8K {
+    d: f32,
+    qs: [i8; QK_K],
+    bsums: [i16; QK_K / 16],
+}
+const _: () = assert!(4 + QK_K + QK_K / 16 * 2 == std::mem::size_of::<BlockQ8K>());
+
+impl GgmlType for BlockQ4_1 {
+    const DTYPE: GgmlDType = GgmlDType::Q4_1;
+    const BLCK_SIZE: usize = QK4_1;
+    type VecDotType = BlockQ8_1;
+
+    fn vec_dot(_n: usize, _xs: &[Self], _ys: &[Self::VecDotType]) -> Result<f32> {
+        todo!()
+    }
+
+    fn from_float(_xs: &[f32], _ys: &mut [Self]) -> Result<()> {
+        todo!()
+    }
+
+    // https://github.com/ggerganov/llama.cpp/blob/468ea24fb4633a0d681f7ac84089566c1c6190cb/ggml.c#L1545
+    fn to_float(xs: &[Self], ys: &mut [f32]) -> Result<()> {
+        let k = ys.len();
+        if k % QK4_1 != 0 {
+            crate::bail!("dequantize_row_q4_1: {k} is not divisible by {QK4_1}");
+        }
+
+        let nb = k / QK4_1;
+        for i in 0..nb {
+            let d = xs[i].d.to_f32();
+            let m = xs[i].m.to_f32();
+
+            for j in 0..(QK4_1 / 2) {
+                let x0 = xs[i].qs[j] & 0x0F;
+                let x1 = xs[i].qs[j] >> 4;
+
+                ys[i * QK4_1 + j] = (x0 as f32) * d + m;
+                ys[i * QK4_1 + j + QK4_1 / 2] = (x1 as f32) * d + m;
+            }
+        }
+        Ok(())
+    }
+}
+
+impl GgmlType for BlockQ5_0 {
+    const DTYPE: GgmlDType = GgmlDType::Q5_0;
+    const BLCK_SIZE: usize = QK5_0;
+    type VecDotType = BlockQ8_0;
+
+    fn vec_dot(_n: usize, _xs: &[Self], _ys: &[Self::VecDotType]) -> Result<f32> {
+        todo!()
+    }
+
+    fn from_float(_xs: &[f32], _ys: &mut [Self]) -> Result<()> {
+        todo!()
+    }
+
+    // https://github.com/ggerganov/llama.cpp/blob/468ea24fb4633a0d681f7ac84089566c1c6190cb/ggml.c#L1566
+    fn to_float(xs: &[Self], ys: &mut [f32]) -> Result<()> {
+        let k = ys.len();
+        if k % QK5_0 != 0 {
+            crate::bail!("dequantize_row_q5_0: {k} is not divisible by {QK5_0}");
+        }
+
+        let nb = k / QK5_0;
+        for i in 0..nb {
+            let d = xs[i].d.to_f32();
+            let qh: u32 = unsafe { std::mem::transmute_copy(&xs[i].qh) };
+
+            for j in 0..(QK5_0 / 2) {
+                let xh_0 = (((qh >> j) << 4) & 0x10) as u8;
+                let xh_1 = ((qh >> (j + 12)) & 0x10) as u8;
+
+                let x0 = ((xs[i].qs[j] & 0x0F) | xh_0) as i32 - 16;
+                let x1 = ((xs[i].qs[j] >> 4) | xh_1) as i32 - 16;
+
+                ys[i * QK5_0 + j] = (x0 as f32) * d;
+                ys[i * QK5_0 + j + QK5_0 / 2] = (x1 as f32) * d;
+            }
+        }
+        Ok(())
+    }
+}
+
+impl GgmlType for BlockQ5_1 {
+    const DTYPE: GgmlDType = GgmlDType::Q5_1;
+    const BLCK_SIZE: usize = QK5_1;
+    type VecDotType = BlockQ8_1;
+
+    fn vec_dot(_n: usize, _xs: &[Self], _ys: &[Self::VecDotType]) -> Result<f32> {
+        todo!()
+    }
+
+    fn from_float(_xs: &[f32], _ys: &mut [Self]) -> Result<()> {
+        todo!()
+    }
+
+    // https://github.com/ggerganov/llama.cpp/blob/468ea24fb4633a0d681f7ac84089566c1c6190cb/ggml.c#L1592
+    fn to_float(xs: &[Self], ys: &mut [f32]) -> Result<()> {
+        let k = ys.len();
+        if k % QK5_1 != 0 {
+            crate::bail!("dequantize_row_q5_1: {k} is not divisible by {QK5_1}");
+        }
+
+        let nb = k / QK5_1;
+        for i in 0..nb {
+            let d = xs[i].d.to_f32();
+            let m = xs[i].m.to_f32();
+            let qh: u32 = unsafe { std::mem::transmute_copy(&xs[i].qh) };
+
+            for j in 0..(QK5_1 / 2) {
+                let xh_0 = (((qh >> j) << 4) & 0x10) as u8;
+                let xh_1 = ((qh >> (j + 12)) & 0x10) as u8;
+
+                let x0 = (xs[i].qs[j] & 0x0F) | xh_0;
+                let x1 = (xs[i].qs[j] >> 4) | xh_1;
+
+                ys[i * QK5_1 + j] = (x0 as f32) * d + m;
+                ys[i * QK5_1 + j + QK5_1 / 2] = (x1 as f32) * d + m;
+            }
+        }
+        Ok(())
+    }
+}
+
+impl GgmlType for BlockQ2K {
+    const DTYPE: GgmlDType = GgmlDType::Q2K;
+    const BLCK_SIZE: usize = QK_K;
+    type VecDotType = BlockQ8K;
+
+    fn vec_dot(_n: usize, _xs: &[Self], _ys: &[Self::VecDotType]) -> Result<f32> {
+        todo!()
+    }
+
+    fn from_float(_xs: &[f32], _ys: &mut [Self]) -> Result<()> {
+        todo!()
+    }
+    // https://github.com/ggerganov/llama.cpp/blob/8183159cf3def112f6d1fe94815fce70e1bffa12/k_quants.c#L354
+    fn to_float(xs: &[Self], ys: &mut [f32]) -> Result<()> {
+        let k = ys.len();
+        if k % QK_K != 0 {
+            crate::bail!("dequantize_row_q2k: {k} is not divisible by {QK_K}")
+        }
+        let mut ys_index = 0;
+        for x in xs {
+            let d = x.d.to_f32();
+            let min = x.dmin.to_f32();
+            let q = &x.qs;
+
+            let mut is = 0;
+            for n in (0..QK_K).step_by(128) {
+                // Step by 32 over q.
+                let q = &q[n / 4..];
+                let mut shift = 0;
+                for _j in 0..4 {
+                    let sc = x.scales[is];
+                    is += 1;
+                    let dl = d * (sc & 0xF) as f32;
+                    let ml = min * (sc >> 4) as f32;
+                    for q in &q[..16] {
+                        let y = dl * ((q >> shift) & 3) as i8 as f32 - ml;
+                        ys[ys_index] = y;
+                        ys_index += 1;
+                    }
+
+                    let sc = x.scales[is];
+                    is += 1;
+                    let dl = d * (sc & 0xF) as f32;
+                    let ml = min * (sc >> 4) as f32;
+                    for q in &q[16..32] {
+                        let y = dl * ((q >> shift) & 3) as i8 as f32 - ml;
+                        ys[ys_index] = y;
+                        ys_index += 1;
+                    }
+
+                    shift += 2;
+                }
+            }
+        }
+        Ok(())
+    }
+}
+
+fn get_scale_min_k4(j: usize, q: &[u8]) -> (u8, u8) {
+    if j < 4 {
+        let d = q[j] & 63;
+        let m = q[j + 4] & 63;
+        (d, m)
+    } else {
+        let d = (q[j + 4] & 0xF) | ((q[j - 4] >> 6) << 4);
+        let m = (q[j + 4] >> 4) | ((q[j] >> 6) << 4);
+        (d, m)
+    }
+}
+
+impl GgmlType for BlockQ4K {
+    const DTYPE: GgmlDType = GgmlDType::Q4K;
+    const BLCK_SIZE: usize = QK_K;
+    type VecDotType = BlockQ8K;
+
+    fn vec_dot(_n: usize, _xs: &[Self], _ys: &[Self::VecDotType]) -> Result<f32> {
+        todo!()
+    }
+
+    fn from_float(_xs: &[f32], _ys: &mut [Self]) -> Result<()> {
+        todo!()
+    }
+    // https://github.com/ggerganov/llama.cpp/blob/8183159cf3def112f6d1fe94815fce70e1bffa12/k_quants.c#L735
+    fn to_float(xs: &[Self], ys: &mut [f32]) -> Result<()> {
+        let k = ys.len();
+        if k % QK_K != 0 {
+            crate::bail!("dequantize_row_q4k: {k} is not divisible by {QK_K}")
+        }
+        let mut ys_index = 0;
+        for x in xs.iter() {
+            let d = x.d.to_f32();
+            let min = x.dmin.to_f32();
+            let q = &x.qs;
+            let mut is = 0;
+            for j in (0..QK_K).step_by(64) {
+                let q = &q[j / 2..j / 2 + 32];
+                let (sc, m) = get_scale_min_k4(is, &x.scales);
+                let d1 = d * sc as f32;
+                let m1 = min * m as f32;
+                let (sc, m) = get_scale_min_k4(is + 1, &x.scales);
+                let d2 = d * sc as f32;
+                let m2 = min * m as f32;
+                for q in q {
+                    let y = d1 * (q & 0xF) as f32 - m1;
+                    ys[ys_index] = y;
+                    ys_index += 1;
+                }
+                for q in q {
+                    let y = d2 * (q >> 4) as f32 - m2;
+                    ys[ys_index] = y;
+                    ys_index += 1;
+                }
+                is += 2;
+            }
+        }
+        Ok(())
+    }
+}
+
+impl GgmlType for BlockQ3K {
+    const DTYPE: GgmlDType = GgmlDType::Q3K;
+    const BLCK_SIZE: usize = QK_K;
+    type VecDotType = BlockQ8K;
+
+    fn vec_dot(_n: usize, _xs: &[Self], _ys: &[Self::VecDotType]) -> Result<f32> {
+        todo!()
+    }
+
+    fn from_float(_xs: &[f32], _ys: &mut [Self]) -> Result<()> {
+        todo!()
+    }
+
+    // https://github.com/ggerganov/llama.cpp/blob/8183159cf3def112f6d1fe94815fce70e1bffa12/k_quants.c#L533
+    fn to_float(_xs: &[Self], _ys: &mut [f32]) -> Result<()> {
+        todo!()
+    }
+}
+
+// https://github.com/ggerganov/llama.cpp/blob/8183159cf3def112f6d1fe94815fce70e1bffa12/k_quants.c#L928
+impl GgmlType for BlockQ5K {
+    const DTYPE: GgmlDType = GgmlDType::Q5K;
+    const BLCK_SIZE: usize = QK_K;
+    type VecDotType = BlockQ8K;
+
+    fn vec_dot(_n: usize, _xs: &[Self], _ys: &[Self::VecDotType]) -> Result<f32> {
+        todo!()
+    }
+
+    fn from_float(_xs: &[f32], _ys: &mut [Self]) -> Result<()> {
+        todo!()
+    }
+    fn to_float(xs: &[Self], ys: &mut [f32]) -> Result<()> {
+        let k = ys.len();
+        if k % QK_K != 0 {
+            crate::bail!("dequantize_row_q5k: {k} is not divisible by {QK_K}")
+        }
+        let mut ys_index = 0;
+        for x in xs.iter() {
+            let d = x.d.to_f32();
+            let min = x.dmin.to_f32();
+            let ql = &x.qs;
+            let qh = &x.qh;
+            let mut is = 0;
+            let mut u1 = 1;
+            let mut u2 = 2;
+            for j in (0..QK_K).step_by(64) {
+                let ql = &ql[j / 2..j / 2 + 32];
+                let (sc, m) = get_scale_min_k4(is, &x.scales);
+                let d1 = d * sc as f32;
+                let m1 = min * m as f32;
+                let (sc, m) = get_scale_min_k4(is + 1, &x.scales);
+                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 };
+                    let y = d1 * ((ql & 0xF) + to_add) as f32 - m1;
+                    ys[ys_index] = y;
+                    ys_index += 1;
+                }
+                for (ql, qh) in ql.iter().zip(qh) {
+                    let to_add = if qh & u2 != 0 { 16 } else { 1 };
+                    let y = d2 * ((ql >> 4) + to_add) as f32 - m2;
+                    ys[ys_index] = y;
+                    ys_index += 1;
+                }
+                is += 2;
+                u1 <<= 2;
+                u2 <<= 2;
+            }
+        }
+        Ok(())
+    }
+}
+
+impl GgmlType for BlockQ6K {
+    const DTYPE: GgmlDType = GgmlDType::Q6K;
+    const BLCK_SIZE: usize = QK_K;
+    type VecDotType = BlockQ8K;
+
+    fn vec_dot(_n: usize, _xs: &[Self], _ys: &[Self::VecDotType]) -> Result<f32> {
+        todo!()
+    }
+
+    fn from_float(_xs: &[f32], _ys: &mut [Self]) -> Result<()> {
+        todo!()
+    }
+
+    // https://github.com/ggerganov/llama.cpp/blob/8183159cf3def112f6d1fe94815fce70e1bffa12/k_quants.c#L1067
+    fn to_float(xs: &[Self], ys: &mut [f32]) -> Result<()> {
+        let k = ys.len();
+        if k % QK_K != 0 {
+            crate::bail!("dequantize_row_q6k: {k} is not divisible by {QK_K}")
+        }
+        for x in xs.iter() {
+            let d = x.d.to_f32();
+            let ql = &x.ql;
+            let qh = &x.qh;
+            let sc = &x.scales;
+            for n in (0..QK_K).step_by(128) {
+                let idx = n / 128;
+                let ys = &mut ys[n..];
+                let sc = &sc[8 * idx..];
+                let ql = &ql[64 * idx..];
+                let qh = &qh[32 * idx..];
+                for l in 0..32 {
+                    let is = l / 16;
+                    let q1 = ((ql[l] & 0xF) | ((qh[l] & 3) << 4)) as i8 - 32;
+                    let q2 = ((ql[l + 32] & 0xF) | (((qh[l] >> 2) & 3) << 4)) as i8 - 32;
+                    let q3 = ((ql[l] >> 4) | (((qh[l] >> 4) & 3) << 4)) as i8 - 32;
+                    let q4 = ((ql[l + 32] >> 4) | (((qh[l] >> 6) & 3) << 4)) as i8 - 32;
+                    ys[l] = d * sc[is] as f32 * q1 as f32;
+                    ys[l + 32] = d * sc[is + 2] as f32 * q2 as f32;
+                    ys[l + 64] = d * sc[is + 4] as f32 * q3 as f32;
+                    ys[l + 96] = d * sc[is + 6] as f32 * q4 as f32;
+                }
+            }
+        }
+        Ok(())
+    }
+}
+
+impl GgmlType for BlockQ8K {
+    const DTYPE: GgmlDType = GgmlDType::Q8K;
+    const BLCK_SIZE: usize = QK_K;
+    type VecDotType = BlockQ8K;
+
+    fn vec_dot(_n: usize, _xs: &[Self], _ys: &[Self::VecDotType]) -> Result<f32> {
+        todo!()
+    }
+
+    fn from_float(_xs: &[f32], _ys: &mut [Self]) -> Result<()> {
+        todo!()
+    }
+
+    // https://github.com/ggerganov/llama.cpp/blob/8183159cf3def112f6d1fe94815fce70e1bffa12/k_quants.c#L533
+    fn to_float(_xs: &[Self], _ys: &mut [f32]) -> Result<()> {
+        todo!()
+    }
+}
+
+impl GgmlType for BlockQ4_0 {
+    const DTYPE: GgmlDType = GgmlDType::Q4_0;
+    const BLCK_SIZE: usize = QK4_0;
+    type VecDotType = BlockQ8_0;
+
+    // https://github.com/ggerganov/llama.cpp/blob/468ea24fb4633a0d681f7ac84089566c1c6190cb/ggml.c#L1525
+    fn to_float(xs: &[Self], ys: &mut [f32]) -> Result<()> {
+        let k = ys.len();
+        if k % QK4_0 != 0 {
+            crate::bail!("dequantize_row_q4_0: {k} is not divisible by {QK4_0}")
+        }
+
+        let nb = k / QK4_0;
+        for i in 0..nb {
+            let d = xs[i].d.to_f32();
+
+            for j in 0..(QK4_0 / 2) {
+                let x0 = (xs[i].qs[j] & 0x0F) as i16 - 8;
+                let x1 = (xs[i].qs[j] >> 4) as i16 - 8;
+
+                ys[i * QK4_0 + j] = (x0 as f32) * d;
+                ys[i * QK4_0 + j + QK4_0 / 2] = (x1 as f32) * d;
+            }
+        }
+        Ok(())
+    }
+
+    fn from_float(xs: &[f32], ys: &mut [Self]) -> Result<()> {
+        // quantize_row_q4_0
+        let qk = Self::BLCK_SIZE;
+        let k = xs.len();
+        if k % qk != 0 {
+            crate::bail!("{k} is not divisible by {}", qk);
+        };
+        let nb = k / qk;
+        if ys.len() != nb {
+            crate::bail!("size mismatch {} {} {}", xs.len(), ys.len(), qk,)
+        }
+        for (i, ys) in ys.iter_mut().enumerate() {
+            let mut amax = 0f32;
+            let mut max = 0f32;
+
+            let xs = &xs[i * qk..(i + 1) * qk];
+            for &x in xs.iter() {
+                if amax < x.abs() {
+                    amax = x.abs();
+                    max = x;
+                }
+            }
+            let d = max / -8.0;
+            let id = if d != 0f32 { 1. / d } else { 0. };
+            ys.d = f16::from_f32(d);
+
+            for (j, q) in ys.qs.iter_mut().enumerate() {
+                let x0 = xs[j] * id;
+                let x1 = xs[qk / 2 + j] * id;
+                let xi0 = u8::min(15, (x0 + 8.5) as u8);
+                let xi1 = u8::min(15, (x1 + 8.5) as u8);
+                *q = xi0 | (xi1 << 4)
+            }
+        }
+        Ok(())
+    }
+
+    // https://github.com/ggerganov/llama.cpp/blob/b5ffb2849d23afe73647f68eec7b68187af09be6/ggml.c#L2361C10-L2361C122
+    fn vec_dot(n: usize, xs: &[Self], ys: &[Self::VecDotType]) -> Result<f32> {
+        let qk = QK8_0;
+        let nb = n / qk;
+        if n % QK8_0 != 0 {
+            crate::bail!("vec_dot_q4_0_q8_0: {n} is not divisible by {qk}")
+        }
+        if nb % 2 != 0 {
+            crate::bail!("vec_dot_q4_0_q8_0: {nb} is not even")
+        }
+
+        // Generic implementation.
+        let mut sumf = 0f32;
+        for i in 0..nb {
+            let mut sum_i = 0;
+            for j in 0..qk / 2 {
+                let v0 = (xs[i].qs[j] & 0x0F) as i32 - 8;
+                let v1 = (xs[i].qs[j] >> 4) as i32 - 8;
+                sum_i += v0 * ys[i].qs[j] as i32 + v1 * ys[i].qs[j + qk / 2] as i32
+            }
+            sumf += sum_i as f32 * f16::to_f32(xs[i].d) * f16::to_f32(ys[i].d)
+        }
+        Ok(sumf)
+    }
+}
+
+impl GgmlType for BlockQ8_0 {
+    const DTYPE: GgmlDType = GgmlDType::Q8_0;
+    const BLCK_SIZE: usize = QK8_0;
+    type VecDotType = BlockQ8_0;
+
+    // https://github.com/ggerganov/llama.cpp/blob/468ea24fb4633a0d681f7ac84089566c1c6190cb/ggml.c#L1619
+    fn to_float(xs: &[Self], ys: &mut [f32]) -> Result<()> {
+        let k = ys.len();
+        if k % QK8_0 != 0 {
+            crate::bail!("dequantize_row_q8_0: {k} is not divisible by {QK8_0}");
+        }
+
+        let nb = k / QK8_0;
+
+        for i in 0..nb {
+            let d = xs[i].d.to_f32();
+
+            for j in 0..QK8_0 {
+                ys[i * QK8_0 + j] = xs[i].qs[j] as f32 * d;
+            }
+        }
+        Ok(())
+    }
+
+    fn from_float(xs: &[f32], ys: &mut [Self]) -> Result<()> {
+        // quantize_row_q8_0
+        let k = xs.len();
+        if k % Self::BLCK_SIZE != 0 {
+            crate::bail!("{k} is not divisible by {}", Self::BLCK_SIZE);
+        };
+        let nb = k / Self::BLCK_SIZE;
+        if ys.len() != nb {
+            crate::bail!(
+                "size mismatch {} {} {}",
+                xs.len(),
+                ys.len(),
+                Self::BLCK_SIZE
+            )
+        }
+        for (i, ys) in ys.iter_mut().enumerate() {
+            let mut amax = 0f32;
+            let xs = &xs[i * Self::BLCK_SIZE..(i + 1) * Self::BLCK_SIZE];
+            for &x in xs.iter() {
+                amax = amax.max(x.abs())
+            }
+            let d = amax / ((1 << 7) - 1) as f32;
+            let id = if d != 0f32 { 1. / d } else { 0. };
+            ys.d = f16::from_f32(d);
+            for (y, &x) in ys.qs.iter_mut().zip(xs.iter()) {
+                *y = f32::round(x * id) as u8
+            }
+        }
+        Ok(())
+    }
+
+    fn vec_dot(_: usize, _: &[Self], _: &[Self::VecDotType]) -> Result<f32> {
+        todo!()
+    }
+}
+
+impl GgmlType for BlockQ8_1 {
+    const DTYPE: GgmlDType = GgmlDType::Q3K;
+    const BLCK_SIZE: usize = QK_K;
+    type VecDotType = BlockQ8_1;
+
+    fn vec_dot(_n: usize, _xs: &[Self], _ys: &[Self::VecDotType]) -> Result<f32> {
+        todo!()
+    }
+
+    fn from_float(_xs: &[f32], _ys: &mut [Self]) -> Result<()> {
+        todo!()
+    }
+
+    // https://github.com/ggerganov/llama.cpp/blob/8183159cf3def112f6d1fe94815fce70e1bffa12/k_quants.c#L533
+    fn to_float(_xs: &[Self], _ys: &mut [f32]) -> Result<()> {
+        todo!()
+    }
+}
+
+// https://github.com/ggerganov/llama.cpp/blob/b5ffb2849d23afe73647f68eec7b68187af09be6/ggml.c#L10605
+pub fn matmul<T: GgmlType>(
+    mkn: (usize, usize, usize),
+    lhs: &[f32],
+    rhs_t: &[T],
+    dst: &mut [f32],
+) -> Result<()> {
+    let (m, k, n) = mkn;
+    if m * k != lhs.len() {
+        crate::bail!("unexpected lhs length {} {mkn:?}", lhs.len());
+    }
+
+    let k_in_lhs_blocks = (k + T::BLCK_SIZE - 1) / T::BLCK_SIZE;
+    let k_in_rhs_blocks = (k + T::VecDotType::BLCK_SIZE - 1) / T::VecDotType::BLCK_SIZE;
+    // TODO: Do not make this copy if the DotType is f32.
+    // TODO: Pre-allocate this.
+    let mut lhs_b = vec![T::VecDotType::zeros(); m * k_in_lhs_blocks];
+    for row_idx in 0..m {
+        let lhs_b = &mut lhs_b[row_idx * k_in_lhs_blocks..(row_idx + 1) * k_in_lhs_blocks];
+        let lhs = &lhs[row_idx * k..(row_idx + 1) * k];
+        T::VecDotType::from_float(lhs, lhs_b)?
+    }
+    let lhs_b = lhs_b.as_slice();
+
+    for row_idx in 0..m {
+        let lhs_row = &lhs_b[row_idx * k_in_lhs_blocks..(row_idx + 1) * k_in_lhs_blocks];
+        let dst_row = &mut dst[row_idx * n..(row_idx + 1) * n];
+        for (col_idx, dst) in dst_row.iter_mut().enumerate() {
+            let rhs_col = &rhs_t[col_idx * k_in_rhs_blocks..(col_idx + 1) * k_in_rhs_blocks];
+            *dst = T::vec_dot(k, rhs_col, lhs_row)?;
+        }
+    }
+    Ok(())
+}