code: def emg_var(X):
      """variance (assuming a mean of zero) for each variable in the segmented time series
      (equals abs_energy divided by (seg_size - 1))"""
      segment_width = X.shape[1]
      return np.sum(X * X, axis=1) / (segment_width - 1)
  
imports: import numpy
  from scipy import stats
label_desc: Use image node_id 28 for calling a global function with example usage: emg_var(X) and returns: unknown