code: def reg_score(self, regres, covmats, targets):
      clf = regres()
      clf.fit(covmats, targets)
      clf.score(covmats, targets)
  
imports: import pickle
  import numpy
  from numpy.testing import assert_array_equal
  import pytest
  from conftest import get_distances, get_means, get_metrics
  from pyriemann.regression import SVR, KNearestNeighborRegressor
  from pyriemann.utils.kernel import kernel
  from pyriemann.utils.mean import mean_covariance
label_desc: Use image node_id 3 for calling the TestRegressor obj's underlying member method code with example usage: obj.reg_score(regres, covmats, targets) without return types