code: def _covariance(self):
      return (self._v * self._w) @ self._v.T
  
imports: from functools import cached_property
  import numpy
  from scipy import linalg
  from scipy.stats import _multivariate
label_desc: Use image node_id 4 for calling the CovViaEigendecomposition obj's underlying member method code with example usage: obj._covariance() and returns: unknown