code: def regularization(self, coef):
      U, s, V = svd(coef, full_matrices=False)
      return np.sum(s)
  
imports: import numpy
  from scipy.linalg import svd
  from lightning.impl.prox_fast import prox_tv1d
label_desc: Use image node_id 2 for calling the TracePenalty obj's underlying member method code with example usage: obj.regularization(coef) and returns: np