code: def infer_dtype_if_necessary(dtype, values, elements, draw):
      if dtype is None and not values:
          return draw(dtype_for_elements_strategy(elements))
      return dtype
  
imports: from collections import OrderedDict, abc
  from copy import copy
  from datetime import datetime, timedelta
  from typing import Any, List, Optional, Sequence, Set, Union
  import attr
  import numpy
  import pandas
  from hypothesis import strategies
  from hypothesis._settings import note_deprecation
  from hypothesis.control import reject
  from hypothesis.errors import InvalidArgument
  from hypothesis.extra import numpy
  from hypothesis.internal.conjecture import utils
  from hypothesis.internal.coverage import check, check_function
  from hypothesis.internal.reflection import get_pretty_function_description
  from hypothesis.internal.validation import check_type, check_valid_interval, check_valid_size, try_convert
  from hypothesis.strategies._internal.strategies import Ex, check_strategy
  from hypothesis.strategies._internal.utils import cacheable, defines_strategy
label_desc: Use image node_id 2 for calling a global function with example usage: infer_dtype_if_necessary(dtype, values, elements, draw) and returns: dtype, draw