ONNX Compatibility

Dear all,

What is the ONNX compatibility of the latest incubator-tvm version? (onnx v1.5?)
Does incubator-tvm supports the classical ML operators described in onnx-ml (svm, tree, linear classifier, etc)?
I also understand that the llvm cpu backend supports more than the opengl or vulkan ones. Where can I find the information as to which backend supports which operations?

Thank you for your support!