code: def test_init(self, estimate, metric, expected_type):
      estimator = AAC(metric, estimate=estimate)
      self.assertTrue(type(estimator) is expected_type)
  
imports: import geomstats.backend
  from geomstats.learning.aac import AAC
  from geomstats.test.parametrizers import Parametrizer
  from geomstats.test.test_case import TestCase
  from .data.aac import AACFrechetMeanTestData, AACGGPCATestData, AACRegressionTestData, AACTestData
label_desc: Use image node_id 1 for calling the TestAAC obj's underlying member method code with example usage: obj.test_init(estimate, metric, expected_type) without return types