code: def create_symmetric_matrix(acf, order=11):
      """Computes a symmetric matrix.
  
      Implementation details and description in:
      https://ccrma.stanford.edu/~orchi/Documents/speaker_recognition_report.pdf
  
      Parameters
      ----------
      acf : nd-array
          Input from which a symmetric matrix is computed
      order : int
          Order
  
      Returns
      -------
      nd-array
          Symmetric Matrix
  
      """
  
      smatrix = np.empty((order, order))
      xx = np.arange(order)
      j = np.tile(xx, order)
      i = np.repeat(xx, order)
      smatrix[i, j] = acf[np.abs(i - j)]
  
      return smatrix
  
file_path: tsfel/tsfel/feature_extraction/features_utils.py
imports: import scipy
  import numpy
label_desc: Use image node_id 6 for calling a global function with example usage: create_symmetric_matrix(acf, order) and returns: smatrix