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### Multi Query Attention Optimization in multi-query attention ``` batch_size, seq_length, three_times_hidden_size = fused_qkv.shape fused_qkv = fused_qkv.view(batch_size, seq_length, self.num_heads + 2, self.head_dim) return fused_qkv[..., :-2, :], fused_qkv[..., [-2], :], fused_qkv[..., [-1], :] ``` which can be optimized to ``` batch_size, seq_length, three_times_hidden_size = fused_qkv.shape fused_qkv = fused_qkv.view(batch_size, seq_length, self.num_heads + 2, self.head_dim) (query, key, value) = fused_qkv.split([self.num_heads, 1, 1], dim=2) return query, key, value ``` this optimization can be validated from nsight profiling and perf benchmarking. <img width="545" alt="image" src="https://github.com/microsoft/onnxruntime/assets/15321482/cefcd061-4a01-4aaf-a008-8e265f7f63e9"> As such, This PR is to Optimize the `Gather/Gather/Slice` Ops to `Split` Kernel. ### Optimization Target <!-- - Why is this change required? What problem does it solve? - If it fixes an open issue, please link to the issue here. --> As 2 `Gather` and 1 `Slice` Kernels are time consuming for backward prop, it would be efficient to use 1 `Split` Kernel ### Example - Before Fusion <img width="419" alt="image" src="https://github.com/microsoft/onnxruntime/assets/15321482/17410319-57ea-4176-afd4-1efdcd3fdbae"> - After Fusion <img width="424" alt="image" src="https://github.com/microsoft/onnxruntime/assets/15321482/f1ee1582-96d4-45f4-8778-49d1f3fd370a"> ### Perf Gain After the optimization, there will have **~7%** perf gain. > The `Transpose` Kernel can be fused too, will update it in next PR. However, after testing Transponse Ops fusion on Falcon model, there is no perf gain. Will not create a new PR. --------- Co-authored-by: ruiren <ruiren@microsoft.com> |
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ONNX Runtime is a cross-platform inference and training machine-learning accelerator.
ONNX Runtime inference can enable faster customer experiences and lower costs, supporting models from deep learning frameworks such as PyTorch and TensorFlow/Keras as well as classical machine learning libraries such as scikit-learn, LightGBM, XGBoost, etc. ONNX Runtime is compatible with different hardware, drivers, and operating systems, and provides optimal performance by leveraging hardware accelerators where applicable alongside graph optimizations and transforms. Learn more →
ONNX Runtime training can accelerate the model training time on multi-node NVIDIA GPUs for transformer models with a one-line addition for existing PyTorch training scripts. Learn more →
Get Started & Resources
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General Information: onnxruntime.ai
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Usage documentation and tutorials: onnxruntime.ai/docs
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YouTube video tutorials: youtube.com/@ONNXRuntime
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Companion sample repositories:
- ONNX Runtime Inferencing: microsoft/onnxruntime-inference-examples
- ONNX Runtime Training: microsoft/onnxruntime-training-examples
Builtin Pipeline Status
| System | Inference | Training |
|---|---|---|
| Windows | ||
| Linux | ||
| Mac | ||
| Android | ||
| iOS | ||
| Web | ||
| Other |
Third-party Pipeline Status
| System | Inference | Training |
|---|---|---|
| Linux |  |
Data/Telemetry
Windows distributions of this project may collect usage data and send it to Microsoft to help improve our products and services. See the privacy statement for more details.
Contributions and Feedback
We welcome contributions! Please see the contribution guidelines.
For feature requests or bug reports, please file a GitHub Issue.
For general discussion or questions, please use GitHub Discussions.
Code of Conduct
This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opencode@microsoft.com with any additional questions or comments.
License
This project is licensed under the MIT License.