code: def _CO_trev_1_num(X):
      # Time-reversibility statistic, ((x_t+1 − x_t)^3)_t.
      y = np.zeros(len(X) - 1)
      for i in range(len(y)):
          y[i] = np.power(X[i + 1] - X[i], 3)
      return np.mean(y)
  
imports: import math
  import numpy
  from sktime.utils.numba.njit import njit
label_desc: Use image node_id 25 for calling a global function with example usage: _CO_trev_1_num(X) and returns: np