code: def test_gsgp_mutation():
      new_gsgp = gsgp.GSGP()
  
      tree_space = tree.TreeSpace(
          n_agents=10,
          n_terminals=2,
          n_variables=1,
          min_depth=1,
          max_depth=5,
          functions=["SUM"],
          lower_bound=[0],
          upper_bound=[10],
      )
  
      new_gsgp._mutation(tree_space)
  
file_path: opytimizer/tests/opytimizer/optimizers/evolutionary/test_gsgp.py
imports: import sys
  import numpy
  from opytimizer.core import function
  from opytimizer.optimizers.evolutionary import gsgp
  from opytimizer.spaces import tree
label_desc: Use image node_id 1 for calling a global function with example usage: test_gsgp_mutation() without return types