code: def check_roundtrip(arr):
      assert_equal(
          arr.as_string_array(),
          LabelArray(
              arr.as_string_array(),
              arr.missing_value,
          ).as_string_array(),
      )
  
imports: from itertools import product
  from operator import eq, ne
  import warnings
  import numpy
  from toolz import take
  from zipline.lib.labelarray import LabelArray
  from zipline.testing import check_arrays, parameter_space, ZiplineTestCase
  from zipline.testing.predicates import assert_equal
  from zipline.utils.compat import unicode
label_desc: Use image node_id 14 for calling the LabelArrayTestCase obj's underlying member method code with example usage: obj.check_roundtrip(arr) without return types