code: def test_rpcs_from_gdal():
      rpcs = RPC.from_gdal(TEST_RPCS_FROM_GDAL)
      for key, value in rpcs.to_dict().items():
          assert key in TEST_RPCS_NATIVE_PYTHON.keys()
          assert value == TEST_RPCS_NATIVE_PYTHON[key]
          assert isinstance(value, (float, list))
          if isinstance(value, list):
              assert len(value) == 20
              assert isinstance(value[0], float)
  
file_path: rasterio/tests/test_rpcs.py
imports: import rasterio
  from rasterio.rpc import RPC
label_desc: Use image node_id 3 for calling a global function with example usage: test_rpcs_from_gdal() without return types