code: def _save_widget(self, filepath: str) -> None:
      self._update_stream_plots()
      self.figure.savefig(filepath)
  
file_path: tensorwatch/tensorwatch/mpl/base_mpl_plot.py
imports: from ..vis_base import VisBase
  import sys, logging
  from abc import abstractmethod
  from ..None import utils
label_desc: Use image node_id 13 for calling the BaseMplPlot obj's underlying member method code with example usage: obj._save_widget(filepath) without return types