code: def test_batch_inv_double_backward(seed, ctx, func_name):
      from nbla_test_utils import backward_function_tester
  
      rng = np.random.RandomState(seed)
      # input must be batched square matrix
      inputs = [
          np.clip(rng.randn(2, 3, 3).astype(np.float32), -0.9, 0.9) * 10
      ]
      backward_function_tester(
          rng, F.batch_inv, inputs, ctx=ctx, atol_accum=1e-2
      )
  
file_path: nnabla/python/test/function/test_batch_inv.py
imports: import pytest
  import numpy
  import nnabla
  import nnabla.functions
  from nbla_test_utils import list_context
label_desc: Use image node_id 3 for calling a global function with example usage: test_batch_inv_double_backward(seed, ctx, func_name) without return types