efc84a43e8
### Description
Adds the session config option `disable_cpu_ep_fallback` to allow the
user to prevent the CPU EP from handling
nodes not supported by other execution providers.
```C++
// Graph nodes that are not supported by the execution providers (EPs) explicitly added to the session are
// assigned (i.e., "fallback") to the CPU EP by default.
//
// This option allows the user to disable the fallback of unsupported graph nodes to the CPU EP.
// If this option is set to "1", session creation will fail if the execution providers other than the CPU EP cannot
// fully support all of the nodes in the graph.
//
// It is invalid to set this option and explicitly add the CPU EP to the session. In this case, session creation
// will also fail with an error.
//
// Option values:
// - "0": CPU EP fallback is not disabled. [DEFAULT]
// - "1": CPU EP fallback is disabled.
static const char* const kOrtSessionOptionsDisableCPUEPFallback = "session.disable_cpu_ep_fallback";
```
#### Example use
```C++
#include "core/session/onnxruntime_cxx_api.h"
#include "core/session/onnxruntime_session_options_config_keys.h"
int main(int argc, char** argv) {
Ort::SessionOptions so;
so.AddConfigEntry(kOrtSessionOptionsDisableCPUEPFallback, "1"); // Disable fallback to the CPU EP.
onnxruntime::ProviderOptions options;
#if defined(_WIN32)
options["backend_path"] = "QnnCpu.dll";
#else
options["backend_path"] = "libQnnCpu.so";
#endif
so.AppendExecutionProvider("QNN", options);
const ORTCHAR_T* ort_model_path = ORT_MODEL_FOLDER "qnn_ep_partial_support.onnx";
Ort::Session session(*ort_env, ort_model_path, so); // Throws exception if nodes fallback to CPU
// ...
```
### Motivation and Context
Makes it easier for application developers to ensure that the entire
model runs on specific EPs. This is critical for Qualcomm/scenarios. If
the compute cannot be offloaded to the NPU, running on CPU is not
acceptable. (could be the difference between 90 second inference and 6
seconds inference)
---------
Co-authored-by: Pranav Sharma <prs@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 documention and tutorials: onnxruntime.ai/docs
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YouTube video tutorials: youtube.com/@ONNXRuntime
-
Companion sample repositories:
- ONNX Runtime Inferencing: microsoft/onnxruntime-inference-examples
- ONNX Runtime Training: microsoft/onnxruntime-training-examples
Build Pipeline Status
| System | Inference | Training |
|---|---|---|
| Windows | ||
| Linux | ||
| Mac | ||
| Android | ||
| iOS | ||
| Web | ||
| Other |
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.