class_docstr: A device checker in Python to check consistency across multiple devices.
  
  This is not the most efficient way to check devices, as the Python interface
  will involve a lot of copies back and forth operations. Use at your own risk.
code: def __init__(self, threshold, device_options):
      self._threshold = threshold
      self._device_options = device_options
  
imports: import numpy
  import copy
  from caffe2.python import workspace
  from caffe2.python.core import InferOpBlobDevicesAsDict
label_desc: Use image node_id 1 to create a new DeviceChecker object  with example: obj = DeviceChecker(threshold, device_options)