code: def test_objectmapper(self):
      df = pdml.ModelFrame([])
      self.assertIs(
          df.random_projection.GaussianRandomProjection,
          rp.GaussianRandomProjection,
      )
      self.assertIs(
          df.random_projection.SparseRandomProjection,
          rp.SparseRandomProjection,
      )
      self.assertIs(
          df.random_projection.johnson_lindenstrauss_min_dim,
          rp.johnson_lindenstrauss_min_dim,
      )
  
imports: import sklearn.random_projection
  import pandas_ml
  import pandas_ml.util.testing
label_desc: Use image node_id 1 for calling the TestRandomProjection obj's underlying member method code with example usage: obj.test_objectmapper() without return types