code: def test_np_array():
      data = np.random.rand(100, 10)
      assert isinstance(format_data(data), list)
      assert isinstance(format_data(data)[0], np.ndarray)
  
file_path: hypertools/tests/test_format_data.py
imports: import numpy
  import pandas
  from hypertools.tools import format_data
  from hypertools.plot.plot import plot
label_desc: Use image node_id 1 for calling a global function with example usage: test_np_array() without return types