code: def add_low_rank(K, R):
      """Efficient addition of two low-rank matrices.
  
      efficient computation of sum of low-rank representations
      using this and then get_low_rank_matrix is more efficient than an
      explicit computation if the rank of the final matrix is not full
  
      Parameters
      ----------
      K, R : LRdec type objects to add
  
      Returns
      -------
      LRdec type object for sum of K and R
      """
      return LRdec(
          np.concatenate((K.U, R.U), axis=1),
          np.concatenate((K.V, R.V), axis=1),
      )
  
imports: import collections
  from functools import partial
  import numpy
  from scipy.sparse.linalg import svds
  from sklearn.base import BaseEstimator, TransformerMixin
  from sktime.dists_kernels.base import BasePairwiseTransformerPanel
label_desc: Use image node_id 20 for calling a global function with example usage: add_low_rank(K, R) and returns: LRdec