code: def start_shift(request):
      """
      Fixture for generating intervals of different types from a start value
      and a shift value that can be added to start to generate an endpoint.
      """
      return request.param
  
file_path: pandas/pandas/tests/arrays/interval/test_overlaps.py
imports: import numpy
  import pytest
  from pandas import Interval, IntervalIndex, Timedelta, Timestamp
  import pandas._testing
  from pandas.core.arrays import IntervalArray
label_desc: Use image node_id 2 for calling a global function with example usage: start_shift(request) and returns: request