linfa-kernel fails to compile about linfa HOT 10 CLOSED

error[E0277]: cannot multiply `CsMatBase<F, usize, Vec<usize>, Vec<usize>, Vec<F>>` by `CsMatBase<F, usize, Vec<usize>, Vec<usize>, Vec<F>>`
   --> algorithms/linfa-kernel/src/lib.rs:196:20
    |
196 | impl<'a, F: Float> Kernel<F> {
    |                    ^^^^^^^^^ no implementation for `CsMatBase<F, usize, Vec<usize>, Vec<usize>, Vec<F>> * CsMatBase<F, usize, Vec<usize>, Vec<usize>, Vec<F>>`
    |
    = help: the trait `Mul` is not implemented for `CsMatBase<F, usize, Vec<usize>, Vec<usize>, Vec<F>>`
    = help: the following other types implement trait `Mul<Rhs>`:
              <&'a CsMatBase<N, I, IpS, IS, DS, Iptr> as Mul<&'b ndarray::ArrayBase<DS2, Dim<[usize; 1]>>>>
              <&'a CsMatBase<N, I, IpS, IS, DS, Iptr> as Mul<&'b ndarray::ArrayBase<DS2, Dim<[usize; 2]>>>>
              <&'a CsMatBase<N, I, IpS1, IS1, DS1, Iptr> as Mul<&'b CsMatBase<N, I, IpS2, IS2, DS2, Iptr>>>
              <&'a CsMatBase<N, I, IpS1, IS1, DS1, Iptr> as Mul<&'b CsVecBase<IS2, DS2, N, I>>>
              <&'a CsMatBase<f32, I, IpStorage, IStorage, DStorage, Iptr> as Mul<f32>>
              <&'a CsMatBase<f64, I, IpStorage, IStorage, DStorage, Iptr> as Mul<f64>>
              <&'a CsMatBase<i16, I, IpStorage, IStorage, DStorage, Iptr> as Mul<i16>>
              <&'a CsMatBase<i32, I, IpStorage, IStorage, DStorage, Iptr> as Mul<i32>>
            and 8 others
note: required for `CsMatBase<F, usize, Vec<usize>, Vec<usize>, Vec<F>>` to implement `Inner`
   --> algorithms/linfa-kernel/src/inner.rs:60:16
    |
60  | impl<F: Float> Inner for CsMat<F> where 
    |                ^^^^^     ^^^^^^^^
61  |     CsMat<F>: Mul {
    |               --- unsatisfied trait bound introduced here