code: def test_kneighbors_regressor_euclidean(self):
      self._test_kneighbors_regressor(3, metric="euclidean")
  
imports: import unittest
  from packaging.version import Version, parse
  import numpy
  import sklearn
  import torch
  from sklearn.neighbors import KNeighborsClassifier, KNeighborsRegressor
  from sklearn import datasets
  import hummingbird.ml
label_desc: Use image node_id 21 for calling the TestSklearnKNeighbors obj's underlying member method code with example usage: obj.test_kneighbors_regressor_euclidean() without return types