sparsekit 0.1.3

Sparsity Kit for Structured Sparsity Specification

SparseKit

SparseKit is the reference implementation of S³ (Structured Sparsity Specification), a unified framework for expressing and pruning structured sparse neural networks.

Browsing the Documentation

Full HTML documentation is bundled in docs/_build/html/. Serve it locally with the included helper script:

python serve_docs.py

Then open http://localhost:8000 in your browser.

The documentation covers:

• Quickstart — install, construct a BlockSpec, prune with StructuredOBS
• Concepts — View, Block, Group, Coupling explained with examples
• API Reference — full docstrings for every public class and function
• Results — single-layer and end-to-end benchmark tables

Library Overview

sparsekit/
├── view.py        # View  — zero-copy strided parameter wrapper (torch.as_strided)
├── group.py       # BlockSpec / BlockCoupling — atomic pruning unit
├── partition.py   # ScopeSpec / ScopeCoupling — decision scope
├── linalg.py      # Utility solvers (LSQR, proximal, thresholds)
├── utils.py       # kth_largest, layout helpers
├── kernels.py     # Triton kernels (auto-dispatched for large K/k)
├── builder.py     # SparsityBuilder fluent API
├── viz.py         # draw_layout() — visualize sparsity patterns
└── pruners/
    ├── obs.py     # StructuredOBS — S-OBS with per-row Schur updates
    ├── quant.py   # quantize_obs, mxfp4_quantize
    └── nvquant.py # nvfp4_quantize, quantize_nvfp4_obs

Quick Example

import torch
from torch.nn import Parameter
from sparsekit import View, BlockSpec, ScopeSpec, StructuredOBS

M, K = 2560, 9728
W = Parameter(torch.randn(M, K, device="cuda"))
X = torch.randn(1024, K, device="cuda")          # calibration inputs

# Express 2:4 sparsity
v     = View.from_existing(W)
group = BlockSpec(v, shape=(1, 1))
part  = ScopeSpec(group, shape=(1, 4))

# Prune with Structured OBS
hessian = (X.T @ X) / X.shape[0]
obs     = StructuredOBS(part, hessian)
obs.prune_true_obs(num_nz=2)                     # keep 2 of 4, in-place

Any of the four experimental patterns replaces the three View/BlockSpec/ScopeSpec lines above; the StructuredOBS call is identical.

Requirements

• Python ≥ 3.10
• PyTorch ≥ 2.8
• Triton 3.4.0
• CUDA (for Triton kernels; CPU fallback available)