code: def supports_device(cls, device="CPU"):
      return device in ["CPU", "GPU", "CUDA"]
  
file_path: CNTK/bindings/python/onnx_cntk/backend.py
imports: import cntk
  import numpy
  from onnx import helper, TensorProto
  from onnx.backend.base import Backend
  from onnx.backend.base import BackendRep
label_desc: Use image node_id 4 for calling the CNTKBackend obj's underlying member method code with example usage: obj.supports_device(cls, device) and returns: unknown