code: def test_valid_epsg_tuples(crs_from, crs_to):
      Transformer.from_crs(("EPSG", crs_from), ("EPSG", crs_to))
      Transformer.from_crs(("EPSG", crs_from), crs_to)
      Transformer.from_crs(("epsg", crs_from), to_epsg_string(crs_to))
      Transformer.from_crs(("EPSG", crs_from), str(crs_to))
      with pytest.raises(RuntimeError):
          Transformer.from_crs(("RPG", crs_from), crs_to)
  
imports: import cupy
  import geopandas
  import numpy
  import pytest
  from cupy.testing import assert_allclose
  from pyproj import Transformer
  from pyproj.enums import TransformDirection
  from shapely.geometry import Point
  import cuspatial
  from cuproj import Transformer
label_desc: Use image node_id 6 for calling a global function with example usage: test_valid_epsg_tuples(crs_from, crs_to) without return types