code: def precision_to_scale_tril(P):
      Lf = torch.linalg.cholesky(torch.flip(P, (-2, -1)))
      L_inv = torch.transpose(torch.flip(Lf, (-2, -1)), -2, -1)
      L = torch.linalg.solve_triangular(
          L_inv,
          torch.eye(P.shape[-1], dtype=P.dtype, device=P.device),
          upper=False,
      )
      return L
  
imports: import math
  import torch
  from torch.fft import irfft, rfft
  from ..None import settings
label_desc: Use image node_id 20 for calling a global function with example usage: precision_to_scale_tril(P) and returns: L