code: def univariate_mean_shift():
      """Generate simple mean shift time series."""
      x = np.concatenate(tuple(np.ones(5) * i**2 for i in range(4)))
      return x[:, np.newaxis]
  
imports: import numpy
  import pytest
  from sktime.annotation.ggs import GGS, GreedyGaussianSegmentation
label_desc: Use image node_id 1 for calling a global function with example usage: univariate_mean_shift() and returns: x