fusedtok

CI PyPI License: MIT Python 3.10+

Fused CUDA kernels for LLM inference — RMSNorm / RoPE / SwiGLU / attention decode and friends, with zero-copy torch tensor support: up to 9.3x faster than PyTorch SDPA (attention decode, RTX 3060, see Benchmarks).

中文文档请看 README_zh.md | English below.

Why

LLM inference frameworks launch many small, memory-bound operators per token. Each launch round-trips through global memory. fusedtok fuses them into single kernels to cut memory traffic and launch overhead.

Operators

Status Kernel Notes
✅ RMSNorm (+residual) LLaMA/Qwen style, fused residual add
✅ LayerNorm with affine
✅ RoPE interleaved and NeoX layouts, kv-cache pos_offset
✅ SwiGLU fused MLP activation
✅ Softmax (row-wise) numerically stable
✅ SiLU / GeLU / GeLU-tanh / ReLU / Tanh / Sigmoid elementwise
✅ add / mul elementwise binary (fused add+residual pattern)
✅ top-k / top-p (nucleus) arrival-ticket radix + early-exit compaction, replayed from a cached CUDA graph; deterministic ties (1.5x vs torch/CUB @131k k=50, parity-to-winning across the whole k range on both test GPUs)
✅ argmax / temperature greedy decoding helpers
✅ sample_topp fused nucleus sampling: softmax -> top-p -> seeded draw, global-mass threshold
✅ sample_topk fused top-k sampling: softmax -> top-k -> renormalize within the window -> seeded draw (2.1x / 1.9x vs the topk+multinomial composite @131k)
✅ repetition penalty CTRL-style, applied to sampled token ids
✅ decode_step the whole decode step fused: penalty -> temperature -> nucleus sample, one call, one readback
✅ quantize_int8 / dequantize_int8 / qadd_int8 symmetric per-tensor INT8, fused dequant-add-requant
✅ qgemm INT8 matmul, int32-exact: cp.async double-buffered pipelined IMMA GEMM with runtime tile tuning (64x64 / 128x128) + warp-per-row GEMV (M=1 decode; 2x vs fp16 projection)
✅ qgemm_perchannel the W8A8 layout real INT8 inference uses: per-output-channel weight scales fused into the same kernel's epilogue at zero cost
✅ attention_decode single-token causal attention with GQA over a contiguous kv-cache: online softmax, flash-decoding split over long caches, per-sequence lengths
✅ attention_prefill fresh-sequence attention over S query rows (causal / bidirectional); convenience path - heavyweight prefill stays SDPA/flash territory (honest ~0.45x)

Install

pip install fusedtok

Prebuilt wheels on PyPI (built with CUDA 12.4): Linux x86_64 (manylinux, cp310-cp313) and Windows x86_64 (cp311-cp313). On other platforms or Python versions pip builds from source automatically:

git clone https://github.com/Hai-Wenxiang/fusedtok.git
cd fusedtok
pip install .

Requirements:

  • NVIDIA GPU of RTX 30 series (Ampere) or newer — e.g. RTX 3060/3090, RTX 4080, RTX 5090, A100, H100
  • CUDA Toolkit >= 12.0
  • A C++17 compiler (MSVC on Windows, GCC/Clang on Linux); Python 3.10+
What is "compute capability"? (click to expand)

Compute capability is NVIDIA's version number for a GPU architecture generation — not a performance score. CUDA code must be compiled for a specific architecture to run on it. The wheel builds native cubins for compute capability 8.0 (A100) and 8.6 (RTX 30) plus a compute_86 PTX fallback, so Ampere runs natively and newer architectures (RTX 40/50, ...) JIT the PTX with their driver.

Compute capability Architecture Example GPUs
7.5 Turing GTX 16xx, RTX 20xx (not supported)
8.0 / 8.6 Ampere A100, RTX 30xx
8.9 Ada RTX 40xx (via PTX)
9.0 Hopper H100 (via PTX)
12.0 Blackwell RTX 50xx (via PTX)

Check yours: run nvidia-smi to see your GPU model, then look it up at https://developer.nvidia.com/cuda-gpus

Usage

numpy in / numpy out, or torch in / torch out — including zero-copy CUDA: kernels read and write torch device buffers directly via data_ptr(), with no staging copies and no host synchronization.

import numpy as np
import torch
import fusedtok

x = np.random.randn(4, 1024).astype(np.float32)
w = np.random.rand(1024).astype(np.float32)

# CPU reference implementation (ground truth, runs anywhere)
y = fusedtok.rmsnorm(x, w, eps=1e-6)

# staged CUDA: copies to GPU, runs kernel, copies back
y = fusedtok.rmsnorm(x, w, cuda=True)

# zero-copy CUDA with torch tensors: kernels run in torch's own buffers,
# stream-ordered with other torch operations
xt, wt = torch.from_numpy(x).cuda(), torch.from_numpy(w).cuda()
yt = fusedtok.rmsnorm(xt, wt)          # -> CUDA torch tensor

# RoPE with kv-cache position offset, NeoX (LLaMA-HF) layout
q = torch.randn(1, 4096, device="cuda")          # new token only
q_rot, k_rot = fusedtok.rope(q, k=None, pos_offset=1023, neox=True)

# attention over a GQA kv-cache: one call per decode step, no score
# materialization, variable-length batches share one cache tensor
out = fusedtok.attention_decode(
    q_heads,                                    # [B, Hq, D] new token
    k_cache, v_cache,                           # [B, Hkv, T, D]
    lens=torch.tensor([1023, 512], dtype=torch.int32, device="cuda"))
# fresh-sequence prefill (causal by default; convenience path)
ctx = fusedtok.attention_prefill(q_all, k_all, v_all, causal=True)

# sampling side: the whole decode step in one fused call
token = fusedtok.decode_step(logits, sampled_ids, penalty=1.1,
                             p=0.9, temperature=0.8, seed=step)
# or step by step:
logits = fusedtok.repetition_penalty(logits, sampled_ids, penalty=1.1)
token = fusedtok.sample_topp(logits, p=0.9, temperature=0.8, seed=step)
# top-k sampling variant (renormalizes within the k survivors)
token = fusedtok.sample_topk(logits, k=50, temperature=0.8, seed=step)

A minimal per-token sampling loop:

import torch, fusedtok as ft

h = torch.zeros(1, 4096, device="cuda")            # decoder state
w = torch.load("rms_weight.pt").cuda()             # float32 weights
wq, wscale = ft.quantize_int8(weight_f32.ravel())  # int8 weights
generated = []
for step in range(256):
    h = ft.rmsnorm(h, w, residual=h)               # fused add + norm
    q = ft.rope(q, k=None, pos_offset=step, neox=True)
    logits = model_output(h)                       # your model
    tok = ft.decode_step(logits, generated, penalty=1.1,
                         p=0.9, temperature=0.8, seed=step)
    generated.append(int(tok))

Every function accepts float32 numpy arrays or torch tensors (other dtypes are converted with a copy) and returns float32 outputs of the same family. CUDA torch tensors may also be bfloat16 - the kernels compute in float32 and convert at the load/store boundary (norm weights are upcast to float32 automatically; sampling/selection ops stay float32). CUDA torch tensors select the zero-copy path automatically.

See examples/demo.py for a runnable tour of every operator.

Correctness

Every kernel ships with a CPU reference implementation and element-wise parity tests (pytest). Tests run on machines without a GPU (CUDA cases skip automatically).

API stability

1.0 freezes the public surface: the names in fusedtok.__all__ (30 operators + helpers) keep their signatures across the 1.x series. Type stubs (__init__.pyi, PEP 561 py.typed) ship with the package. New operators arrive in minor releases; breaking changes require a new major version and a deprecation window. Determinism promises: selection ties resolve to the earliest index; sampling is deterministic per seed.

Benchmarks

RTX 3060 (sm_86), float32, zero-copy torch tensors, CUDA-event timing over 3 independent rounds (means below; per-round values in the JSON), vs the equivalent PyTorch reference (composite eager expressions; attention references use pre-expanded heads - repeat_interleave outside the timed region). Largest shape per op; full data: docs/benchmark_rtx3060.json, reproduce with python benchmarks/bench.py:

Op Shape fusedtok PyTorch reference Speedup
attention_decode (GQA) T=16384, D=128 853 µs 7614 µs (SDPA) 8.92x
RoPE NeoX (q+k) [8192×4096] 1641 µs 10061 µs 6.13x
RMSNorm (+residual) [4096×4096] 614 µs 2061 µs 3.36x
SwiGLU [4096×4096] 614 µs 1025 µs 1.67x
top-k (k=50) [131072] 79 µs 137 µs 1.75x
top-k (k=4096, mid-k) [131072] 113 µs 127 µs 1.12x
LayerNorm [4096×4096] 446 µs 616 µs 1.38x
Softmax [4096×4096] 414 µs 432 µs 1.04x
SiLU / GeLU / add [4096×4096] ~412 µs ~411 µs ~1.0x
sample_topk k=50 [131072] 135 µs 292 µs (topk+multinomial) 2.16x
sample_topp p=0.9 (peaked) [131072] 160 µs 496 µs (sort+mask+multinomial) 3.11x
sample_topp p=0.9 (flat worst case) [131072] 25388 µs 391 µs 0.02x (honest, see below)
argmax [131072] 65 µs 45 µs 0.69x (incl. host readback)
int8 qgemm pc (W8A8) [4096×4096×4096] 3553 µs (38.7 TOPS) 2046 µs (cuBLASLt + broadcast) 0.58x (honest)
attention_prefill (causal) S=1024, D=128 5732 µs 2560 µs (SDPA flash) 0.45x (honest)

Row-wise kernels (norms, softmax) autotune their thread-block size per shape at first call (v0.4.1); the table reflects the tuned choices.

fusedtok vs PyTorch reference

RTX 5060 Ti (Blackwell, sm_120) — same suite, largest shape per op (full data: docs/benchmark_rtx5060ti.json):

Op Shape fusedtok PyTorch reference Speedup
RoPE NeoX (q+k) [8192×4096] 1384 µs 8368 µs 6.04x
attention_decode (GQA) T=16384, D=128 575 µs 2682 µs (SDPA) 4.67x
RMSNorm (+residual) [4096×4096] 504 µs 1657 µs 3.29x
SwiGLU [4096×4096] 504 µs 858 µs 1.70x
top-k (k=50) [131072] 27 µs 41 µs (CUB) 1.50x
top-k (k=4096, mid-k) [131072] 50 µs 54 µs (CUB) 1.09x
LayerNorm / Softmax [4096×4096] ~345 µs ~348 µs 1.0x
sample_topk k=50 [131072] 47 µs 93 µs (topk+multinomial) 1.98x
sample_topp p=0.9 (peaked) [131072] 62 µs 155 µs (sort+mask+multinomial) 2.49x
sample_topp p=0.9 (flat worst case) [131072] 17635 µs 159 µs 0.01x (honest, see below)
argmax [131072] 17 µs 14 µs 0.83x (incl. host readback)
int8 qgemm (IMMA) [4096×4096×4096] 2063 µs (66.6 TOPS) 800 µs (cuBLASLt) 0.39x (honest)
int8 qgemm pc (W8A8) [4096×4096×4096] 2079 µs (66.1 TOPS) 1142 µs (cuBLASLt + broadcast) 0.55x (honest)
attention_prefill (causal) S=1024, D=128 3291 µs 1421 µs (SDPA flash) 0.43x (honest)

On smaller shapes the Blackwell card shows bigger wins (softmax 2.5x, RMSNorm 3.2x at 256 rows, attention decode 3.8x at T=4096 running 235 GB/s) - the launch-overhead share shrinks as shapes grow; full sweep in the JSON.

fusedtok vs PyTorch reference (RTX 5060 Ti)

The PyPI wheel ships sm_80/sm_86 cubins plus a compute_86 PTX fallback — verified to JIT and run correctly on Blackwell (sm_120) drivers.

Fusions win big (RoPE / RMSNorm / SwiGLU) because eager mode round-trips intermediate tensors through global memory. The v0.4 selection pipeline (arrival-ticket radix rounds + early-exit compaction, replayed from a cached CUDA graph) beats torch's CUB radix select at small k on both GPUs; the v1.0 retune (in-block-sort threshold and sort chunk both dropped 2048 -> 1024 - a single block bitonic-sorting 2048 keys was the whole mid-k regression) brings the mid-k window to parity-or-winning as well (k=4096 @131k: 1.12x / 1.09x). The fused samplers win against the eager composites when the logits look like real decode output (sample_topp peaked: 3.11x / 2.49x; sample_topk: 2.16x / 1.98x); on a FLAT distribution sample_topp is honestly 0.01-0.02x - the nucleus then spans most of the vocab, the widening loop reruns the pipeline on ever-larger windows (x8 jumps since 1.0.1), and the final serial scan is single-threaded by design (documented since v0.4; torch's fully parallel sort handles that regime natively). attention_decode wins big at decode (one launch streams the GQA cache once at up to ~157 GB/s effective while SDPA pays head expansion or small-query inefficiency); attention_prefill is the honest convenience path at ~0.45x of SDPA's flash backend — no tensor cores by design, so heavyweight prefill stays with SDPA/FlashAttention. The INT8 decode GEMV moves half the bytes of an fp16 projection and runs at full memory bandwidth (2x); the pipelined IMMA GEMM (v1.0 rework: cp.async double-buffered slabs, runtime-tuned 64x64 / 128x128 tiles) reaches ~39 TOPS on a 3060 and ~67 TOPS on a 5060 Ti — 2x-4x the v0.4 kernel — but cuBLASLt (torch._int_mm) still holds a ~2.2-2.6x lead: its tiles pipeline deeper and its epilogue is tuned per-arch. For now qgemm is the exact / graph-capturable / zero-copy INT8 path, not the fastest one; honest numbers, a CUTLASS-class schedule stays future work. The per-channel variant (qgemm_perchannel, the W8A8 layout INT8 inference actually uses) fuses the per-output-channel scale multiply into the same epilogue at zero kernel cost — the composite torch reference pays for that broadcast separately, which is where its 0.55-0.58x comes from.

Development

See CONTRIBUTING.md for the full guide (test rules, error contract, determinism invariants). Quick start:

# Windows: run inside a VS developer prompt (vcvars64)
cmake -S . -B build -G Ninja -DCMAKE_BUILD_TYPE=Release
cmake --build build
# from repo root: PYTHONPATH picks up the built module, conftest.py adds python/
$env:PYTHONPATH = "$PWD/build"        # Windows
PYTHONPATH=$PWD/build                 # Linux
python -m pytest tests -q
python benchmarks/bench.py            # GPU benchmark + chart

Windows / Linux. Windows uses MSVC via nvcc; CI builds and runs the CPU test suite on every push.

Roadmap

  • v0.2 (done): bf16 zero-copy, radix-select top-k/top-p, fused nucleus sampling, single-read softmax, CUDA-graph verified
  • v0.3 (done): chunk-merge selection sort + parallel nucleus count, bf16x4/x8 vectorized elementwise, INT8 quantize/dequantize utilities
  • v0.4 (done): arrival-ticket selection pipeline (no cooperative launch, early-exit compaction, cached CUDA graphs), stream-aware launchers everywhere (real CUDA-graph capture), INT8 compute path (IMMA qgemm + decode GEMV), fused decode_step sampling
  • v0.4.1 (done): runtime block-size autotuning for the row-wise kernels (norms/softmax pick 128..1024 threads per shape at first call)
  • v0.5 (done): attention - GQA decode attention over a contiguous kv-cache (flash-decoding split over long caches, per-sequence lengths) and a tiled prefill path (honest ~0.45x of SDPA flash - the convenience path); single-chart-per-GPU benchmarks; Windows wheels in the PyPI publish pipeline
  • 1.0 (released): pipelined tensor-core INT8 GEMM (cp.async double-buffering, runtime tile tuning; 17 -> 39 TOPS on a 3060) with per-channel weight scales (W8A8), fused top-k sampling (2.1x vs the topk+multinomial composite), top-k mid-range-k parity, text hygiene gate, wheel matrix expansion (Linux cp310-313, Windows cp311-313), API freeze

Community

License

MIT — see LICENSE. Third-party notices: NOTICES.md.

Project links

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Credits

Author: Hai-Wenxiang

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MIT License (MIT License)

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Python >=3.10

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torch test

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The following attestation bundles were made for fusedtok-1.0.1-cp310-cp310-manylinux_2_34_x86_64.whl:

Publisher: publish.yml on Hai-Wenxiang/fusedtok

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Release history Release notifications | RSS feed

1.1.0

8 files

This release

1.0.1 This release

8 files

1.0.0

8 files

0.5.1

3 files

0.5.0

3 files

0.4.1

2 files

0.4.0

2 files

0.3.1

2 files

0.3.0

2 files

0.2.1

2 files

0.2.0

2 files

0.1.2

2 files

0.1.1

2 files

0.1.0

2 files

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