code: def test_transform_text():
      assert isinstance(text2mat(data)[0], np.ndarray)
  
file_path: hypertools/tests/test_text2mat.py
imports: import numpy
  from hypertools.tools import text2mat
  from sklearn.decomposition import LatentDirichletAllocation
label_desc: Use image node_id 1 for calling a global function with example usage: test_transform_text() without return types