The "ONNX Model Zoo" link on https://github.com/dotnet/machinelearning-samples/tree/master/samples/csharp/getting-started/DeepLearning_ObjectDetection_Onnx page is broken - I supposed you meant https://github.com/onnx/models?
The "ONNX Model Zoo" link on https://github.com/dotnet/machinelearning-samples/tree/master/samples/csharp/getting-started/DeepLearning_ObjectDetection_Onnx page is broken - I supposed you meant https://github.com/onnx/models?