class_docstr: context class to allow setting the current context.
  Example usage with layer:
      modifiers = {'modifier1': modifier1, 'modifier2': modifier2}
      with Modifiers(modifiers):
          modifier = ModifierContext.current().get_modifier('modifier1')
          layer(modifier=modifier)
code: def _context_class(self):
      raise NotImplementedError
  
file_path: pytorch/caffe2/python/modifier_context.py
label_desc: Use image node_id 2 for calling the UseModifierBase obj's underlying member method code with example usage: obj._context_class() without return types