code: def cntk_layer(self):
      return self.layer
  
file_path: MMdnn/mmdnn/conversion/cntk/cntk_graph.py
imports: import cntk
  from mmdnn.conversion.common.DataStructure.graph import GraphNode, Graph
label_desc: Use image node_id 4 for calling the CntkGraphNode obj's underlying member method code with example usage: obj.cntk_layer() and returns: self