Merge pull request #2 from LaurentMazare/matmul

Adding matmul.

1 files changed, 138 insertions, 0 deletions

diff --git a/src/cpu_backend.rs b/src/cpu_backend.rs
index 01c17245..2c708389 100644
--- a/src/cpu_backend.rs
+++ b/src/cpu_backend.rs
@@ -1,5 +1,6 @@
 use crate::storage::{BinaryOp, UnaryOp};
 use crate::{DType, Error, Result, Shape, StridedIndex};
+use gemm::{gemm, Parallelism};
 
 // TODO: Think about whether we would be better off with a dtype and
 // a buffer as an owned slice of bytes.
@@ -17,6 +18,14 @@ impl CpuStorage {
         }
     }
 
+    pub fn as_slice<D: crate::WithDType>(&self) -> Result<&[D]> {
+        D::cpu_storage_as_slice(self)
+    }
+
+    pub fn as_mut_slice<D: crate::WithDType>(&mut self) -> Result<&mut [D]> {
+        D::cpu_storage_as_mut_slice(self)
+    }
+
     pub(crate) fn affine_impl(
         &self,
         shape: &Shape,
@@ -97,6 +106,93 @@ impl CpuStorage {
         }
     }
 
+    pub(crate) fn matmul_impl(
+        &self,
+        rhs: &Self,
+        (b, m, n, k): (usize, usize, usize, usize),
+        lhs_stride: &[usize],
+        rhs_stride: &[usize],
+    ) -> Result<Self> {
+        let a_skip: usize = m * k;
+        let b_skip: usize = n * k;
+        let c_skip: usize = m * n;
+
+        let rank = lhs_stride.len();
+        let lhs_cs = lhs_stride[rank - 1];
+        let lhs_rs = lhs_stride[rank - 2];
+
+        let rhs_cs = rhs_stride[rank - 1];
+        let rhs_rs = rhs_stride[rank - 2];
+
+        if lhs_stride.len() > 2 {
+            let lhs_batch_stride = &lhs_stride[..rank - 2];
+            let rhs_batch_stride = &rhs_stride[..rank - 2];
+
+            if lhs_batch_stride != [a_skip] || rhs_batch_stride != [b_skip] {
+                // Temporary error before we support abitrary striding.
+                return Err(Error::UnexpectedStriding);
+            }
+        }
+
+        let mut dst = vec![0.0; b * m * n];
+
+        let dst_shape: Shape = (m, n).into();
+        let dst_strides = dst_shape.stride_contiguous();
+        let dst_rs = dst_strides[0];
+        let dst_cs = dst_strides[1];
+
+        for step in 0..b {
+            let lhs_p = &self.as_slice::<f32>()?[step * a_skip..];
+            let rhs_p = &rhs.as_slice::<f32>()?[step * b_skip..];
+            let dst_p = &mut dst[step * c_skip..];
+            unsafe {
+                gemm(
+                    // m: usize,
+                    m,
+                    // n: usize,
+                    n,
+                    // k: usize,
+                    k,
+                    // dst: *mut T,
+                    dst_p.as_mut_ptr(),
+                    // dst_cs: isize,
+                    dst_cs as isize,
+                    // dst_rs: isize,
+                    dst_rs as isize,
+                    // read_dst: bool,
+                    false,
+                    // lhs: *const T,
+                    lhs_p.as_ptr(),
+                    // lhs_cs: isize,
+                    lhs_cs as isize,
+                    // lhs_rs: isize,
+                    lhs_rs as isize,
+                    // rhs: *const T,
+                    rhs_p.as_ptr(),
+                    // rhs_cs: isize,
+                    rhs_cs as isize,
+                    // rhs_rs: isize,
+                    rhs_rs as isize,
+                    // alpha: T,
+                    1.0,
+                    // beta: T,
+                    1.0,
+                    // conj_dst: bool,
+                    false,
+                    // conj_lhs: bool,
+                    false,
+                    // conj_rhs: bool,
+                    true,
+                    // parallelism: Parallelism
+                    Parallelism::None,
+                )
+            }
+        }
+
+        let c = Self::F32(dst);
+        Ok(c)
+    }
+
     pub(crate) fn ones_impl(shape: &Shape, dtype: DType) -> Self {
         let elem_count = shape.elem_count();
         match dtype {
@@ -125,3 +221,45 @@ impl CpuStorage {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::{Device, Tensor};
+
+    #[test]
+    fn simple_matmul() -> Result<()> {
+        let data = vec![1.0f32, 2.0, 3.0, 4.0];
+        let a = Tensor::from_slice(&data, (2, 2), &Device::Cpu)?;
+        let data = vec![1.0f32, 2.0, 3.0, 4.0];
+        let b = Tensor::from_slice(&data, (2, 2), &Device::Cpu)?;
+
+        let c = a.matmul(&b)?;
+        assert_eq!(c.to_vec2::<f32>()?, &[&[7.0f32, 10.0], &[15.0, 22.0]]);
+
+        let data = vec![1.0f32, 2.0];
+        let a = Tensor::from_slice(&data, (2, 1), &Device::Cpu)?;
+        let data = vec![3.0f32, 4.0];
+        let b = Tensor::from_slice(&data, (1, 2), &Device::Cpu)?;
+        let c = a.matmul(&b)?;
+        assert_eq!(c.to_vec2::<f32>()?, &[&[3.0, 4.0], &[6.0, 8.0]]);
+
+        let data: Vec<_> = (0..6).map(|i| i as f32).collect();
+        let a = Tensor::from_slice(&data, (2, 3), &Device::Cpu)?;
+        let data: Vec<_> = (0..6).map(|i| (i + 2) as f32).collect();
+        let b = Tensor::from_slice(&data, (3, 2), &Device::Cpu)?;
+        let c = a.matmul(&b)?;
+        assert_eq!(c.to_vec2::<f32>()?, &[&[16., 19.], &[52., 64.]]);
+
+        let data: Vec<_> = (0..12).map(|i| i as f32).collect();
+        let a = Tensor::from_slice(&data, (2, 2, 3), &Device::Cpu)?;
+        let data: Vec<_> = (0..12).map(|i| (i + 2) as f32).collect();
+        let b = Tensor::from_slice(&data, (2, 3, 2), &Device::Cpu)?;
+        let c = a.matmul(&b)?;
+        assert_eq!(
+            c.to_vec3::<f32>()?,
+            &[&[&[16., 19.], &[52., 64.]], &[&[214., 235.], &[304., 334.]]]
+        );
+        Ok(())
+    }
+}