code: def _process(self, obj, key=None):
      return obj.relabel(self.p.label)
  
file_path: holoviews/holoviews/tests/core/test_operation.py
imports: import param
  from holoviews.core.operation import Operation
  from holoviews.element import Curve
  from holoviews.element.comparison import ComparisonTestCase
  from holoviews.streams import Params, Stream
label_desc: Use image node_id 1 for calling the ExampleOperation obj's underlying member method code with example usage: obj._process(obj, key) and returns: obj