code: def test_qmf(self):
      assert_array_equal(wavelets.qmf([1, 1]), [1, -1])
  
file_path: catboost/contrib/python/scipy/py3/scipy/signal/tests/test_wavelets.py
imports: import numpy
  from numpy.testing import assert_equal, assert_array_equal, assert_array_almost_equal, assert_array_less, assert_
  from scipy.signal import wavelets
label_desc: Use image node_id 1 for calling the TestWavelets obj's underlying member method code with example usage: obj.test_qmf() without return types