struct
ell_t
ELLPACK (ELL) format.
Stores up to pitch non-zeros per row in two row-major dense arrays of size rows * pitch. Rows shorter than the matrix-wide max are padded with the sentinel value index_t(-1) in the indices array; the matching value entries are zero. This wastes O((pitch - avg_nnz) * rows) of memory but enables predi
Defined in include/loops/container/ell.hxxTemplate Parameters
| Parameter | Description |
|---|---|
index_t | Type of the column indices. |
value_t | Type of the non-zero values. |
space | Memory space (host / device / managed). |
offset_t | |
rhs_space | |
rhs_space | |
offset_t | |
rhs_space |
Members
rows
Number of rows.
cols
Number of columns.
nnzs
True non-zero count (excludes padding).
pitch
Atoms per row; equals max-nnz-per-row over the matrix.
indices
Column indices; length rows * pitch, row-major.
values
Nonzero values; length rows * pitch, row-major.
Methods
__host__ __device__ index_t sentinel()
std::size_t max_nnz_per_row(const csr_t< index_t, offset_t, value_t, rhs_space > &csr)
Probe the ELL pitch (max-nnz-per-row) of a CSR matrix without materializing the dense storage. ell_t()
ell_t(std::size_t r, std::size_t c, std::size_t nnz, std::size_t p)
ell_t(const ell_t< index_t, value_t, rhs_space > &rhs)
Cross-space copy. ell_t(const csr_t< index_t, offset_t, value_t, rhs_space > &csr)
Build an ELL view of a CSR matrix.