code: def test_load_dataframe(loader):
      """Test that we can load all baked in TSC problems into nested pd.DataFrames."""
      # should work for all
      X, y = loader()
      assert isinstance(X, pd.DataFrame)
      assert isinstance(y, np.ndarray)
      assert y.ndim == 1
      X = loader(return_X_y=False)
      assert isinstance(X, pd.DataFrame)
  
imports: import numpy
  import pandas
  import pytest
  from sktime.datasets import load_acsf1, load_arrow_head, load_basic_motions, load_italy_power_demand, load_japanese_vowels, load_osuleaf, load_plaid, load_tecator, load_unit_test
label_desc: Use image node_id 1 for calling a global function with example usage: test_load_dataframe(loader) without return types