Function dense_gemv_batchm 

pub fn dense_gemv_batchm(
    gpu: &dyn GpuBackend,
    kernel: KernelHandle,
    input: DevicePtr,
    weight: &DenseWeight,
    output: DevicePtr,
    m: u32,
    n: u32,
    k: u32,
    out_stride: u32,
    stream: u64,
) -> Result<()>