code: def test_movstd(self):
      a = np.array([1.0, 2.0, 4.0, 8.0])
      m = 2
  
      assert np.allclose(movstd(a, m), np.array([0.5, 1.0, 2.0]))
  
imports: from matrixprofile.utils import *
  import numpy
  import pytest
label_desc: Use image node_id 7 for calling the TestClass obj's underlying member method code with example usage: obj.test_movstd() without return types