code: def test_objectmapper(self):
      df = pdml.ModelFrame([])
      self.assertIs(
          df.cluster.AffinityPropagation, cluster.AffinityPropagation
      )
      self.assertIs(
          df.cluster.AgglomerativeClustering,
          cluster.AgglomerativeClustering,
      )
      self.assertIs(df.cluster.Birch, cluster.Birch)
      self.assertIs(df.cluster.DBSCAN, cluster.DBSCAN)
      self.assertIs(
          df.cluster.FeatureAgglomeration, cluster.FeatureAgglomeration
      )
      self.assertIs(df.cluster.KMeans, cluster.KMeans)
      self.assertIs(df.cluster.MiniBatchKMeans, cluster.MiniBatchKMeans)
      self.assertIs(df.cluster.MeanShift, cluster.MeanShift)
      self.assertIs(
          df.cluster.SpectralClustering, cluster.SpectralClustering
      )
  
      self.assertIs(
          df.cluster.bicluster.SpectralBiclustering,
          cluster.bicluster.SpectralBiclustering,
      )
      self.assertIs(
          df.cluster.bicluster.SpectralCoclustering,
          cluster.bicluster.SpectralCoclustering,
      )
  
imports: import pytest
  import numpy
  import sklearn.datasets
  import sklearn.cluster
  import sklearn.preprocessing
  import sklearn.metrics
  import pandas_ml
  import pandas_ml.util.testing
label_desc: Use image node_id 1 for calling the TestCluster obj's underlying member method code with example usage: obj.test_objectmapper() without return types