code: def ensure_valid_dtype(input_graph, start_list):
      vertex_dtype = input_graph.edgelist.edgelist_df.dtypes[0]
      if isinstance(start_list, cudf.Series):
          start_list_dtypes = start_list.dtype
      else:
          start_list_dtypes = start_list.dtypes[0]
  
      if start_list_dtypes != vertex_dtype:
          warning_msg = (
              "Uniform neighbor sample requires 'start_list' to match the graph's "
              f"'vertex' type. input graph's vertex type is: {vertex_dtype} and got "
              f"'start_list' of type: {start_list_dtypes}."
          )
          warnings.warn(warning_msg, UserWarning)
          start_list = start_list.astype(vertex_dtype)
  
      return start_list
  
file_path: cugraph/python/cugraph/cugraph/sampling/uniform_neighbor_sample.py
imports: from __future__ import annotations
  from pylibcugraph import ResourceHandle
  from pylibcugraph import uniform_neighbor_sample
  from cugraph.sampling.sampling_utilities import sampling_results_from_cupy_array_dict
  import numpy
  import cudf
  import cupy
  import warnings
  from typing import Union, Tuple, Sequence, List
  from typing import TYPE_CHECKING
label_desc: Use image node_id 1 for calling a global function with example usage: ensure_valid_dtype(input_graph, start_list) and returns: start_list