code: def initialize_vars(
      multioutput: str = "uniform_average",
      num_regressors: tf.int32 = 0,
  ):
      return RSquare(
          multioutput=multioutput, num_regressors=num_regressors
      )
  
imports: import numpy
  import pytest
  import tensorflow
  from sklearn.metrics import r2_score
  from tensorflow_addons.metrics import RSquare
  from tensorflow_addons.metrics.r_square import _VALID_MULTIOUTPUT
label_desc: Use image node_id 2 for calling a global function with example usage: initialize_vars(multioutput, num_regressors) and returns: RSquare