aule-attention 0.3.3

FlashAttention that just works. No compilation. Any GPU. AMD ROCm, NVIDIA CUDA, Intel, Apple via Vulkan.

aule-attention

FlashAttention that just works. No compilation. Any GPU.

Version: 0.3.3

What's New in 0.3.3

• Windows Vulkan Support: Added Windows DLL - Vulkan backend now works on Windows!
• Windows AMD Fix: Automatic fallback to Vulkan on Windows + AMD (Triton AMD doesn't support Windows)

What's New in 0.3.0

• GQA/MQA Support: Full Grouped Query Attention and Multi-Query Attention for Vulkan backend
• Cross-Attention: Different sequence lengths for Q and K/V tensors
• ComfyUI Compatible: Works with Stable Diffusion, SDXL, Flux, SD3 (use causal=False)
• 20% Faster: Phase 1 performance optimizations
• Bug Fixes: Tensor cache fix for GQA, blocky noise fix for diffusion models

Installation

pip install aule-attention

Quick Start

from aule import flash_attention
import torch

q = torch.randn(1, 8, 512, 64, device='cuda')
k = torch.randn(1, 8, 512, 64, device='cuda')
v = torch.randn(1, 8, 512, 64, device='cuda')

output = flash_attention(q, k, v, causal=True)

ComfyUI / Diffusion Models

import aule
aule.install()  # Patches PyTorch SDPA globally

# Now all models using F.scaled_dot_product_attention use aule
# For diffusion models, causal=False is used automatically

GQA (Grouped Query Attention)

# 32 query heads, 8 key/value heads (4:1 ratio)
q = torch.randn(1, 32, 512, 64)
k = torch.randn(1, 8, 512, 64)
v = torch.randn(1, 8, 512, 64)

output = flash_attention(q, k, v, causal=True)

Features

• No compilation at install time
• Works on AMD, NVIDIA, Intel, and Apple GPUs
• Training support with backward pass (Triton backend)
• Grouped Query Attention (GQA) and Multi-Query Attention (MQA) support
• Cross-attention with different Q/KV sequence lengths
• O(N) memory complexity via FlashAttention-2 algorithm

Backends

Backend	Hardware	Features
Triton	AMD ROCm (Linux), NVIDIA CUDA	Training + Inference, head_dim up to 128
Vulkan	Any Vulkan 1.2+ GPU (including Windows AMD)	Inference, head_dim up to 64, GQA/MQA
CPU	NumPy	Fallback, any head_dim

Windows + AMD: Automatically uses Vulkan backend (Triton AMD only supports Linux).

API

from aule import flash_attention, get_available_backends, install

# Compute attention
output = flash_attention(query, key, value, causal=True, scale=None)

# Check available backends
backends = get_available_backends()  # ['vulkan', 'cpu'] or ['triton', 'vulkan', 'cpu']

# Install as PyTorch SDPA replacement (for ComfyUI, Transformers, etc.)
install()  # Auto-select best backend
install(backend='vulkan', verbose=True)  # Force backend + logging

Supported Hardware

Triton Backend (Training + Inference)

• AMD Instinct: MI300X, MI300A, MI250X, MI250, MI210, MI100
• NVIDIA Datacenter: H100, A100, A10, L40S
• NVIDIA Consumer: RTX 4090, 4080, 3090, 3080

Vulkan Backend (Inference)

• AMD RDNA3: RX 7900 XTX, 7900 XT, 7800 XT
• AMD RDNA2: RX 6900 XT, 6800 XT, 6700 XT
• Intel Arc: A770, A750, A580
• Intel Integrated: 12th/13th/14th Gen
• Apple Silicon: M1, M2, M3 (via MoltenVK)

License

MIT License - Aule Technologies

Links

• GitHub Repository
• PyPI