code: def test_log_prob_sum(self):
      log_px_torch = dist.Delta(self.v).log_prob(self.test_data).sum()
      self.assertEqual(log_px_torch.item(), 0)
  
file_path: gpytorch/test/distributions/test_delta.py
imports: import unittest
  import numpy
  import torch
  import gpytorch.distributions
  from gpytorch.test.base_test_case import BaseTestCase
label_desc: Use image node_id 2 for calling the TestDelta obj's underlying member method code with example usage: obj.test_log_prob_sum() without return types