code: def to_integer_slice(slice_: slice, start: pd.Period) -> slice:
      """
      Returns an equivalent slice with integer bounds, given the start timestamp
      of the sequence it will apply to.
      """
      start_is_int = isinstance(slice_.start, (int, type(None)))
      stop_is_int = isinstance(slice_.stop, (int, type(None)))
  
      if start_is_int and stop_is_int:
          return slice_
  
      if isinstance(slice_.start, pd.Period):
          start_offset = (slice_.start - start).n
          assert start_offset >= 0
      elif start_is_int:
          start_offset = slice_.start
      else:
          raise ValueError(
              "Can only use None, int, or pd.Period for slicing, got type "
              f"{type(slice_.start)}"
          )
  
      if isinstance(slice_.stop, pd.Period):
          stop_offset = (slice_.stop - start).n + 1
          assert stop_offset >= 0
      elif stop_is_int:
          stop_offset = slice_.stop
      else:
          raise ValueError(
              "Can only use None, int, or pd.Period for slicing, got type "
              f"{type(slice_.stop)}"
          )
  
      return slice(start_offset, stop_offset)
  
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 3 for calling a global function with example usage: to_integer_slice(slice_, start) and returns: slice, slice_