fix: update ONNX provider search and warn if GPU will not be used #401
  Add this suggestion to a batch that can be applied as a single commit.
  This suggestion is invalid because no changes were made to the code.
  Suggestions cannot be applied while the pull request is closed.
  Suggestions cannot be applied while viewing a subset of changes.
  Only one suggestion per line can be applied in a batch.
  Add this suggestion to a batch that can be applied as a single commit.
  Applying suggestions on deleted lines is not supported.
  You must change the existing code in this line in order to create a valid suggestion.
  Outdated suggestions cannot be applied.
  This suggestion has been applied or marked resolved.
  Suggestions cannot be applied from pending reviews.
  Suggestions cannot be applied on multi-line comments.
  Suggestions cannot be applied while the pull request is queued to merge.
  Suggestion cannot be applied right now. Please check back later.
  
    
  
    
yolox.pywas using a rather suspicious way of getting the available ONNX runtime providers, when there is a perfectly good function calledonnxruntime.get_available_providers()that it could be using instead.Also make it warn the user if CUDA is not present since they need to explicitly install a particular version of
onnxruntime-gpufor this to work (see Unstructured-IO/unstructured#2506 for details)