class_docstr: Visualize the data from single pipeline execution.
class_docstr_tok: ["Visualize","the","data","from","single","pipeline","execution","."]
code: def nodes(self):
      return list(self._node_collection.keys())
  
imports: import re
  from typing import Dict, Any, List
  from towhee.utils.log import engine_log
label_desc: Use image node_id 3 for calling the PipeVisualizer obj's underlying member method code with example usage: obj.nodes() and returns: list