code: def test_numpy_api(self):
      array = np.array([[1, 2], [3, 4]])
      array, _ = convert_to_jtensor(array)
      self.assert_(isinstance(array, JTensor))
      self.assertEqual(array.storage.shape, (2, 2))
  
imports: import unittest
  import pandas
  from bigdl.ppml.fl.data_utils import *
label_desc: Use image node_id 2 for calling the TestDataUtils obj's underlying member method code with example usage: obj.test_numpy_api() without return types