code: def get_backend_fnc(func_name):
      func_name_ls = func_name.split(".")
      gs_func = gs
      for name in func_name_ls:
          gs_func = getattr(gs_func, name)
  
      return gs_func
  
imports: import random
  import numpy
  import pytest
  import scipy
  import geomstats.backend
  from geomstats.test.test_case import TestCase
  from geomstats.test.vectorization import generate_vectorization_data
label_desc: Use image node_id 4 for calling a global function with example usage: get_backend_fnc(func_name) and returns: gs_func