code: def _get_column_prefix(self, stream_vis, i):
      return "[S.{}]:{}".format(stream_vis.index, i)
  
file_path: tensorwatch/tensorwatch/text_vis.py
imports: from .None import utils
  from .vis_base import VisBase
label_desc: Use image node_id 2 for calling the TextVis obj's underlying member method code with example usage: obj._get_column_prefix(stream_vis, i) and returns: str