code: def _cholesky(x):
      return x.sqrt() if x.dim() == 1 else torch.linalg.cholesky(x)
  
imports: import math
  from collections import namedtuple
  import torch
  import pyro
  from pyro.ops.arrowhead import SymmArrowhead, sqrt, triu_gram, triu_inverse, triu_matvecmul
  from pyro.ops.dual_averaging import DualAveraging
  from pyro.ops.welford import WelfordArrowheadCovariance, WelfordCovariance
label_desc: Use image node_id 2 for calling a global function with example usage: _cholesky(x) and returns: unknown