code: def test_batch_log_prob(self):
      log_px_torch = (
          dist.Delta(self.vs_expanded)
          .log_prob(self.batch_test_data_1)
          .data
      )
      assert_equal(log_px_torch.sum().item(), 0)
      log_px_torch = (
          dist.Delta(self.vs_expanded)
          .log_prob(self.batch_test_data_2)
          .data
      )
      assert_equal(log_px_torch.sum().item(), float("-inf"))
  
file_path: pyro/tests/distributions/test_delta.py
imports: from unittest import TestCase
  import numpy
  import pytest
  import torch
  import pyro.distributions
  from tests.common import assert_equal
label_desc: Use image node_id 3 for calling the TestDelta obj's underlying member method code with example usage: obj.test_batch_log_prob() without return types