code: def _set_time_axis_hists(self, hists) -> None:
      # auto guess the time_axis: find the most frequent first column name in the histograms list
      first_cols = [k.split(":")[0] for k in list(hists.keys())]
      self.time_axis = max(set(first_cols), key=first_cols.count)
  
imports: from pathlib import Path
  from typing import Any, Dict, List, Optional, Union
  import pandas
  from histogrammar.dfinterface.make_histograms import get_time_axes
  from pydantic import BaseModel
  from pydantic_settings import BaseSettings
  from typing_extensions import Literal
label_desc: Use image node_id 3 for calling the Settings obj's underlying member method code with example usage: obj._set_time_axis_hists(hists) without return types