code: def objective_function(opt):
      score = -opt["x1"] * opt["x1"]
      return score
  
imports: import time
  import pytest
  import numpy
  import pandas
  from hyperactive import Hyperactive
  from hyperactive.optimizers import BayesianOptimizer, TreeStructuredParzenEstimators, ForestOptimizer
label_desc: Use image node_id 7 for calling a global function with example usage: objective_function(opt) and returns: score