code: def testExtractNumberOscillationsTwoPeriods(self):
      value = [[0.0], [1.0], [0.0], [1.0], [0.0]]
      assert extract_number_oscillations(value, 0, 0.5) == 2
  
imports: import unittest
  import matplotlib
  import numpy
  from pyclustering.cluster.kmeans import kmeans
  from pyclustering.cluster.center_initializer import kmeans_plusplus_initializer
  import pyclustering.utils
  from pyclustering.utils import euclidean_distance
  from pyclustering.utils import average_neighbor_distance
  from pyclustering.utils import read_sample
  from pyclustering.utils import data_corners
  from pyclustering.utils import norm_vector
  from pyclustering.utils import rgb2gray
  from pyclustering.utils import extract_number_oscillations
  from pyclustering.utils import draw_clusters
  from pyclustering.samples.definitions import SIMPLE_SAMPLES, IMAGE_SIMPLE_SAMPLES
label_desc: Use image node_id 19 for calling the Test obj's underlying member method code with example usage: obj.testExtractNumberOscillationsTwoPeriods() without return types