KinGeorge/Dr.Sparse-OTF-test-set

Dr.Sparse OTF Test Set

100 sparse matrices from the SuiteSparse Matrix Collection, converted to the flat binary format the Dr.Sparse benchmark harness reads. This is the held-out evaluation set for LLM-generated CUDA sparse kernels (SpMV / SpMM / SpGEMM), kept separate from the matrices the models were developed against.

Layout

Matrices are grouped into size tiers by row count, the convention Dr.Sparse task discovery scans for:

tier	rows	matrices	size
level1_small	< 3,500	8	2.6 MB
level2_medium	3,500 – 34,000	35	155 MB
level3_large	34,000 – 1,100,000	38	2.1 GB
level4_huge	> 1,100,000	19	8.6 GB

summary.csv and manifest.json carry per-matrix rows, cols, nnz, kind, square, avg_row and density. Row counts span 800 to 67.7M and nnz spans 10.4K to 138.8M.

Binary format

Each .bin is CSR plus a dense vector, little-endian, no padding:

int32   num_rows
int32   num_cols
int32   nnz
int32   row_ptr[num_rows + 1]
int32   col_ind[nnz]
float32 values[nnz]
float32 x[num_cols]          # dense RHS vector, for SpMV

Reading one in Python:

import numpy as np

def read_bin(path):
    with open(path, "rb") as f:
        rows, cols, nnz = np.fromfile(f, dtype=np.int32, count=3)
        row_ptr = np.fromfile(f, dtype=np.int32, count=rows + 1)
        col_ind = np.fromfile(f, dtype=np.int32, count=nnz)
        values  = np.fromfile(f, dtype=np.float32, count=nnz)
        x       = np.fromfile(f, dtype=np.float32, count=cols)
    return rows, cols, nnz, row_ptr, col_ind, values, x

The C++ side of the harness reads the same layout in level_sparse/data_loader.h.

Use with Dr.Sparse

The tiers match the layout Dr.Sparse task discovery scans, so downloading straight into level_sparse/otf_test_set/ needs no staging step:

hf download KinGeorge/Dr.Sparse-OTF-test-set --repo-type dataset \
    --local-dir level_sparse/otf_test_set        # all 100, 11.6 GB

./run_b200_eval_parallel.sh --model qwen3.8 --dry-run

level4_huge is 8.6 GB of the total, so for a quick smoke test pull only the small tiers. Note that --include takes one pattern per flag — passing several after a single --include silently matches nothing:

hf download KinGeorge/Dr.Sparse-OTF-test-set --repo-type dataset \
    --local-dir level_sparse/otf_test_set \
    --include "level1_small/*" --include "level2_medium/*"    # 158 MB

If you already have the .bin files elsewhere on disk, point the staging script at them instead and it will lay the tiers out as symlinks:

python level_sparse/stage_otf_test_set.py --src /path/to/flat/bins

Provenance and licence

Matrices are redistributed from the SuiteSparse Matrix Collection (Davis & Hu, The University of Florida Sparse Matrix Collection, ACM TOMS 38(1), 2011), whose entries are CC BY 4.0. Only the storage format was changed: the .mtx sources were converted to CSR (single precision) and a dense x vector drawn from a standard normal was appended so SpMV has a fixed right-hand side. That vector is baked into each file, so results are reproducible across runs, but it was not generated from a recorded seed and is not reproducible from the .mtx source alone. Matrix values are otherwise unmodified. Please cite SuiteSparse if you use this set.