code: def setUpClass(cls):
      cls.iris = datasets.load_iris()
      cls.x = cls.iris.data + np.random.normal(
          0, 1e-3, cls.iris.data.shape
      )
      cls.y = cls.iris.target
  
imports: import unittest
  from functools import partial
  import numpy
  from scipy.spatial.distance import pdist, squareform, cdist
  from sklearn import datasets
  from sklearn.metrics import accuracy_score
  from sklearn.neighbors import KNeighborsClassifier, NearestNeighbors
  import openTSNE
  from openTSNE import affinity, initialization, nearest_neighbors, TSNEEmbedding
label_desc: Use image node_id 1 for calling the TestUsage obj's underlying member method code with example usage: obj.setUpClass(cls) without return types