Implement CSR/CSC * Dense std operations

nalgebra-sparse/src/ops/impl_std_ops.rs

@@ -2,12 +2,14 @@ use crate::csr::CsrMatrix;
 use crate::csc::CscMatrix;
 
 use std::ops::{Add, Div, DivAssign, Mul, MulAssign, Sub, Neg};
-use crate::ops::serial::{spadd_csr_prealloc, spadd_csc_prealloc, spadd_pattern,
-                         spmm_pattern, spmm_csr_prealloc, spmm_csc_prealloc};
-use nalgebra::{ClosedAdd, ClosedMul, ClosedSub, ClosedDiv, Scalar};
+use crate::ops::serial::{spadd_csr_prealloc, spadd_csc_prealloc, spadd_pattern, spmm_pattern,
+                         spmm_csr_prealloc, spmm_csc_prealloc, spmm_csc_dense, spmm_csr_dense};
+use nalgebra::{ClosedAdd, ClosedMul, ClosedSub, ClosedDiv, Scalar, Matrix, Dim,
+               DMatrixSlice, DMatrix, Dynamic};
 use num_traits::{Zero, One};
 use std::sync::Arc;
 use crate::ops::{Op};
+use nalgebra::base::storage::Storage;
 
 /// Helper macro for implementing binary operators for different matrix types
 /// See below for usage.
@@ -276,3 +278,30 @@ macro_rules! impl_div {
 
 impl_div!(CsrMatrix);
 impl_div!(CscMatrix);
+
+macro_rules! impl_spmm_cs_dense {
+    ($matrix_type:ident, $spmm_fn:ident) => {
+        impl<'a, T, R, C, S> Mul<&'a Matrix<T, R, C, S>> for &'a $matrix_type<T>
+        where
+            &'a Matrix<T, R, C, S>: Into<DMatrixSlice<'a, T>>,
+            T: Scalar + ClosedMul + ClosedAdd + ClosedSub + ClosedDiv + Neg + Zero + One,
+            R: Dim,
+            C: Dim,
+            S: Storage<T, R, C>,
+        {
+            type Output = DMatrix<T>;
+
+            fn mul(self, rhs: &'a Matrix<T, R, C, S>) -> Self::Output {
+                let rhs = rhs.into();
+                let (_, ncols) = rhs.data.shape();
+                let nrows = Dynamic::new(self.nrows());
+                let mut result = Matrix::zeros_generic(nrows, ncols);
+                $spmm_fn(T::zero(), &mut result, T::one(), Op::NoOp(self), Op::NoOp(rhs));
+                result
+            }
+        }
+    }
+}
+
+impl_spmm_cs_dense!(CsrMatrix, spmm_csr_dense);
+impl_spmm_cs_dense!(CscMatrix, spmm_csc_dense);

nalgebra-sparse/tests/unit_tests/ops.rs

@@ -1087,4 +1087,32 @@ proptest! {
         prop_assert_eq!(&result_ref, &expected_result);
     }
 
+    #[test]
+    fn csr_mul_dense(
+        // a and b have dimensions compatible for multiplication
+        (a, b)
+        in csr_strategy()
+            .prop_flat_map(|a| {
+                let cols = PROPTEST_MATRIX_DIM;
+                let b = matrix(PROPTEST_I32_VALUE_STRATEGY, a.ncols(), cols);
+                (Just(a), b)
+            }))
+    {
+        prop_assert_eq!(&a * &b, &DMatrix::from(&a) * &b);
+    }
+
+    #[test]
+    fn csc_mul_dense(
+        // a and b have dimensions compatible for multiplication
+        (a, b)
+        in csc_strategy()
+            .prop_flat_map(|a| {
+                let cols = PROPTEST_MATRIX_DIM;
+                let b = matrix(PROPTEST_I32_VALUE_STRATEGY, a.ncols(), cols);
+                (Just(a), b)
+            }))
+    {
+        prop_assert_eq!(&a * &b, &DMatrix::from(&a) * &b);
+    }
+
 }