class_docstr: Visualize the data of a node.
class_docstr_tok: ["Visualize","the","data","of","a","node","."]
code: def op_input(self):
      return self._op_input
  
imports: import re
  from typing import Dict, Any, List
  from towhee.utils.log import engine_log
label_desc: Use image node_id 7 for calling the NodeVisualizer obj's underlying member method code with example usage: obj.op_input() and returns: self