Struct CscMatrix 

pub struct CscMatrix<T: GpuFloat> { /* private fields */ }

A sparse matrix in Compressed Sparse Column (CSC) format, stored on GPU.

The matrix has shape (rows, cols) with nnz non-zero elements.

Implementations

impl<T: GpuFloat> CscMatrix<T>

pub fn from_host( rows: u32, cols: u32, col_ptr: &[i32], row_idx: &[i32], values: &[T], ) -> SparseResult<Self>

Creates a CSC matrix from host-side arrays, uploading to GPU.

Arguments

• rows – Number of rows.
• cols – Number of columns.
• col_ptr – Column pointer array of length cols + 1.
• row_idx – Row indices of length nnz.
• values – Non-zero values of length nnz.

Errors

Returns SparseError::InvalidFormat if array lengths are inconsistent.

pub fn from_device( rows: u32, cols: u32, nnz: u32, col_ptr: DeviceBuffer<i32>, row_idx: DeviceBuffer<i32>, values: DeviceBuffer<T>, ) -> SparseResult<Self>

Creates a CSC matrix from pre-allocated device buffers.

Errors

Returns SparseError::InvalidFormat if buffer lengths are inconsistent.

pub fn to_host(&self) -> SparseResult<(Vec<i32>, Vec<i32>, Vec<T>)>

Downloads the CSC arrays from GPU to host memory.

Errors

Returns SparseError::Cuda on transfer failure.

pub fn to_csr(&self) -> SparseResult<CsrMatrix<T>>

Converts this CSC matrix to CSR format on the host.

Downloads data, transposes the structure (CSC -> CSR is analogous to transposing the matrix), then uploads.

Errors

Returns SparseError::Cuda on transfer failure.

pub fn rows(&self) -> u32

Returns the number of rows.

pub fn cols(&self) -> u32

Returns the number of columns.

pub fn nnz(&self) -> u32

Returns the number of non-zero elements.

pub fn col_ptr(&self) -> &DeviceBuffer<i32>

Returns a reference to the column pointer device buffer.

pub fn row_idx(&self) -> &DeviceBuffer<i32>

Returns a reference to the row index device buffer.

pub fn values(&self) -> &DeviceBuffer<T>

Returns a reference to the values device buffer.