docstr: not used
docstr_tok: ["not","used"]
code: def _compute_covariance_(self):
      """not used"""
      self.inv_cov = np.linalg.inv(self.covariance)
      self._norm_factor = (
          np.sqrt(np.linalg.det(2 * np.pi * self.covariance)) * self.n
      )
  
file_path: statsmodels/statsmodels/sandbox/nonparametric/kdecovclass.py
imports: import numpy
  from numpy.testing import assert_almost_equal, assert_
  import scipy
  from scipy import stats
  import matplotlib.pylab
label_desc: Use image node_id 2 for calling the gaussian_kde_covfact obj's underlying member method code with example usage: obj._compute_covariance_() without return types