Is the caffe or .pb or .onnx file available online to download for the pretrained models that are already present in OpenVINO toolkit such as vehicle-detection-adas-0002? Those files are .xml and .bin but I need .caffe or .pb file for now.
I am not sure i understand your question but let me try and answer. Intel does not use transfer learning to create those models - they are trained and created from scratch by Intel and those xml and *.bin will only work on Intel hardware.
Hope it helps,
Some of the models are, in fact, available in the original format. See https://github.com/opencv/openvino_training_extensions and https://github.com/opencv/training_toolbox_caffe for reference.
Unfortunately, vehicle-detection-adas-0002 is not available and we have no immediate plans to share it. You can try using vehicle-license-plate-detector and see if it works for you