code: def load_factor(ts, resolution=None, norm=None):
      
      if norm is None:
          norm = ts.max()
  
      if resolution is not None:
          ts = ts.resample(rule=resolution).mean()
  
      lf = ts / norm
  
      return lf
docs: Calculate the ratio of input vs. norm over a given interval.
  
      Parameters
      ----------
      ts : pandas.Series
          timeseries
      resolution : str, optional
          interval over which to calculate the ratio
          default: resolution of the input timeseries
      norm : int | float, optional
          denominator of the ratio
          default: the maximum of the input timeseries
  
      Returns
      -------
      pandas.Series