code: def batch_shape(self):
      return torch.Size([])
  
imports: import unittest
  import torch
  import gpytorch
  from gpytorch.test.variational_test_case import VariationalTestCase
label_desc: Use image node_id 1 for calling the TestBatchDecoupledVariationalGP obj's underlying member method code with example usage: obj.batch_shape() and returns: torch