Replace Objective-C bridge with Swift ONNX runtime backend

README.md

@@ -1,32 +1,48 @@
 # Swift Package Manager for ONNX Runtime
 
-A light-weight repository for providing [Swift Package Manager (SPM)](https://www.swift.org/package-manager/) support for [ONNXRuntime](https://github.com/microsoft/onnxruntime). The ONNX Runtime native package is included as a binary dependency of the SPM package.
+Swift-native ONNX Runtime bindings derived from the public Objective-C wrapper surface, but implemented without the Objective-C bridge so the package can build on Linux.
 
+## Status
 
-SPM is the alternative to CocoaPods when desired platform to consume is mobile iOS.
+- Public API covers inference, session/run options, tensor values, checkpoint state, and training session entry points.
+- Backend is wired to the ONNX Runtime C API and training C API through a Swift system library target.
+- The package expects `libonnxruntime` and headers to be available on the host, typically via `pkg-config`.
 
-## Note
+## Requirements
 
-The `objectivec/` directory is copied from the [ORT repo](https://github.com/microsoft/onnxruntime/tree/main/objectivec) and it's expected to match. It will be updated periodically/before release to merge new changes.
+- Swift 6.1+
+- ONNX Runtime installed on the system with:
+  - `libonnxruntime`
+  - `onnxruntime_c_api.h`
+  - `onnxruntime_training_c_api.h`
+  - `pkg-config` metadata for `libonnxruntime`
 
-## Contributing
+## Usage
 
-This project welcomes contributions and suggestions.  Most contributions require you to agree to a
-Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us
-the rights to use your contribution. For details, visit https://cla.opensource.microsoft.com.
+```swift
+import OnnxRuntimeBindings
 
-When you submit a pull request, a CLA bot will automatically determine whether you need to provide
-a CLA and decorate the PR appropriately (e.g., status check, comment). Simply follow the instructions
-provided by the bot. You will only need to do this once across all repos using our CLA.
+let environment = try ORTEnv(loggingLevel: .warning)
+let sessionOptions = try ORTSessionOptions()
+let session = try ORTSession(
+    env: environment,
+    modelPath: "/path/to/model.onnx",
+    sessionOptions: sessionOptions
+)
 
-This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/).
-For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or
-contact [opencode@microsoft.com](mailto:opencode@microsoft.com) with any additional questions or comments.
+let inputTensor = try ORTValue(
+    tensorData: NSMutableData(data: inputData),
+    elementType: .float,
+    shape: [1, 224, 224, 3]
+)
 
-## Trademarks
+let outputs = try session.run(
+    inputs: ["input": inputTensor],
+    outputNames: ["output"]
+)
+```
 
-This project may contain trademarks or logos for projects, products, or services. Authorized use of Microsoft 
-trademarks or logos is subject to and must follow 
-[Microsoft's Trademark & Brand Guidelines](https://www.microsoft.com/en-us/legal/intellectualproperty/trademarks/usage/general).
-Use of Microsoft trademarks or logos in modified versions of this project must not cause confusion or imply Microsoft sponsorship.
-Any use of third-party trademarks or logos are subject to those third-party's policies.
+## Notes
+
+- The `objectivec/` directory remains in the repo as the reference contract surface from upstream ONNX Runtime.
+- The shipped Swift package target is the pure Swift `OnnxRuntimeBindings` implementation under `swift/OnnxRuntimeBindings`.