code: def periods_between(
      start: pd.Period,
      end: pd.Period,
  ) -> int:
      """
      Count how many periods fit between ``start`` and ``end``
      (inclusive). The frequency is taken from ``start``.
  
      For example:
  
          >>> start = pd.Period("2021-01-01 00", freq="2H")
          >>> end = pd.Period("2021-01-01 11", "2H")
          >>> periods_between(start, end)
          6
  
          >>> start = pd.Period("2021-03-03 23:00", freq="30T")
          >>> end = pd.Period("2021-03-04 03:29", freq="30T")
          >>> periods_between(start, end)
          9
      """
      if start > end:
          return 0
      return ((end - start).n // start.freq.n) + 1
  
imports: from abc import ABC, abstractmethod
  from dataclasses import dataclass
  from typing import Generator, Optional, Tuple
  import pandas
  from gluonts.dataset import Dataset, DataEntry
  from gluonts.dataset.field_names import FieldName
label_desc: Use image node_id 1 for calling a global function with example usage: periods_between(start, end) and returns: unknown, int