code: def test_serialize(serialize_test, hyperparameters):
      serialize_test(GaussianProcessEstimator, hyperparameters)
  
imports: import pytest
  from gluonts.mx.model.gp_forecaster import GaussianProcessEstimator
label_desc: Use image node_id 3 for calling a global function with example usage: test_serialize(serialize_test, hyperparameters) without return types