code: def test_variable_length_stack_zerosize(is_right_pad):
      arrays = [np.zeros(shape=(0, 2)) for _ in range(5)]
  
      stacked = stack(
          arrays,
          variable_length=True,
          is_right_pad=is_right_pad,
      )
  
      assert stacked.shape[0] == 5
      assert stacked.shape[1] == 1
      assert stacked.shape[2] == 2
  
imports: import itertools
  from functools import partial
  from typing import Iterable
  import numpy
  from pandas.tseries.frequencies import to_offset
  import pytest
  from gluonts.dataset.common import Dataset
  from gluonts.dataset.loader import DataBatch, InferenceDataLoader, TrainDataLoader
  from gluonts.mx.batchify import _pad_arrays, batchify, stack
  from gluonts.testutil.dummy_datasets import get_dataset
  from gluonts.transform import ContinuousTimeInstanceSplitter, ContinuousTimeUniformSampler, ContinuousTimePredictionSampler
label_desc: Use image node_id 9 for calling a global function with example usage: test_variable_length_stack_zerosize(is_right_pad) without return types