code: def test_fit(self):
      retval = self.tsne.fit(self.x)
      self.assertIs(type(retval), TSNE)
  
file_path: openTSNE/tests/test_sklearn_wrapper.py
imports: import unittest
  import numpy
  from openTSNE.sklearn import TSNE
label_desc: Use image node_id 2 for calling the TestTSNECorrectness obj's underlying member method code with example usage: obj.test_fit() without return types