code: def _cg_a_mult(OtOr, X, y, v):
      """
      Compute the multiplication Av, where A = X'X + X'yX + λ.
      """
      XtXv = OtOr @ v
      XtyXv = X.T @ (y * (X @ v))
      return XtXv + XtyXv
  
imports: import logging
  from collections import namedtuple
  import numpy
  from numba import njit, prange
  from csr import CSR
  from seedbank import numpy_rng
  from .bias import Bias
  from .mf_common import MFPredictor
  from ..data import sparse_ratings
  from ..None import util
  from ..math.solve import _dposv
label_desc: Use image node_id 6 for calling a global function with example usage: _cg_a_mult(OtOr, X, y, v) and returns: unknown