code: def test_add_zero_padding(
      self, start_pad_width, end_pad_width, args, gc, dc
  ):
      lengths, data = args
      op = core.CreateOperator(
          "AddPadding",
          ["data", "lengths"],
          ["output", "lengths_out"],
          padding_width=start_pad_width,
          end_padding_width=end_pad_width,
      )
      self.assertReferenceChecks(
          gc,
          op,
          [data, lengths],
          partial(
              _add_padding_ref, start_pad_width, end_pad_width, True
          ),
      )
  
imports: from caffe2.python import core
  from functools import partial
  from hypothesis import given, settings
  import caffe2.python.hypothesis_test_util
  import caffe2.python.serialized_test.serialized_test_util
  import hypothesis.strategies
  import numpy
  import unittest
  from caffe2.python import workspace
label_desc: Use image node_id 7 for calling the TestSequenceOps obj's underlying member method code with example usage: obj.test_add_zero_padding(start_pad_width, end_pad_width, args, gc, dc) without return types