code: def _all_equal_freq(*series: Union[TimeSeries, None]) -> bool:
      """
      Returns `True` is all of the specified (i.e. non-`None`) `series` have the same frequency.
      """
      freqs = _get_freqs(*series)
      return len(set(freqs)) == 1
  
imports: import warnings
  from functools import reduce
  from math import inf
  from typing import Dict, List, Optional, Sequence, Tuple, Union
  from itertools import chain
  import numpy
  import pandas
  from numpy.lib.stride_tricks import as_strided
  from darts.logging import get_logger, raise_if, raise_if_not, raise_log
  from darts.timeseries import TimeSeries
  from darts.utils.utils import get_single_series, series2seq
label_desc: Use image node_id 15 for calling a global function with example usage: _all_equal_freq() and returns: unknown