code: def fit_transform(self, X, y=None) -> CumlArray:
      return self.fit(X).transform(X)
  
imports: from cuml.internals.input_utils import input_to_cuml_array
  from cuml.internals.input_utils import determine_array_type
  from cuml.internals.input_utils import determine_array_dtype
  from cuml.common.array_descriptor import CumlArrayDescriptor
  from cuml.internals.array import CumlArray
  import pytest
  from cuml.internals.safe_imports import cpu_only_import
  import pickle
  import cuml
  import cuml.internals
  from cuml.internals.safe_imports import gpu_only_import
label_desc: Use image node_id 7 for calling the DummyTestEstimator obj's underlying member method code with example usage: obj.fit_transform(X, y) and returns: self