code: def root_mean_square(X):
      """root mean square for each variable in the segmented time series"""
      segment_width = X.shape[1]
      return np.sqrt(np.sum(X * X, axis=1) / segment_width)
  
imports: import numpy
  from scipy import stats
label_desc: Use image node_id 27 for calling a global function with example usage: root_mean_square(X) and returns: np