fix test warning for assertNotEquals (#474)

Summary:
Pull Request resolved: #474

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Reviewed By: Balandat

Differential Revision: D22395237

fbshipit-source-id: 3b2743b60c4fa06b3aba0ad3c921be53a48c3f1f

Author: sdaulton

test/sampling/test_sampler.py

@@ -43,7 +43,7 @@ def test_batch_range(self):
         # check that base samples are cleared after batch_range set
         posterior = _get_test_posterior(self.device)
         _ = sampler(posterior)
-        self.assertNotEquals(sampler.base_samples, None)
+        self.assertNotEqual(sampler.base_samples, None)
         sampler.batch_range = (0, -2)
         self.assertEqual(sampler.base_samples, None)
 
@@ -236,7 +236,7 @@ def test_batch_range(self):
         # check that base samples are cleared after batch_range set
         posterior = _get_test_posterior(self.device)
         _ = sampler(posterior)
-        self.assertNotEquals(sampler.base_samples, None)
+        self.assertNotEqual(sampler.base_samples, None)
         sampler.batch_range = (0, -2)
         self.assertEqual(sampler.base_samples, None)