code: def _whiten(self, x):
      return x @ self._chol_P
  
imports: from functools import cached_property
  import numpy
  from scipy import linalg
  from scipy.stats import _multivariate
label_desc: Use image node_id 2 for calling the CovViaPrecision obj's underlying member method code with example usage: obj._whiten(x) and returns: unknown