def initialize_iv_extraction_fse(ubm, T):
    """Estimate matrices for approximation of the i-vectors.
    For more information, refers to [Cumani13]_
    
    :param ubm: Mixture object, Universal Background Model
    :param T: Raw TotalVariability matrix
    
    :return:
      Q: Q matrix as described in [Glembeck11]
      D_bar_c: matrices as described in [Glembeck11]
      Tnorm: total variability matrix pre-normalized using the co-variance of the UBM
    """
    pass
