code: def test_diff_execution(setup):
      rs = np.random.RandomState(0)
      raw = pd.DataFrame(
          rs.randint(1000, size=(10, 8)),
          columns=["col" + str(i + 1) for i in range(8)],
      )
  
      raw1 = raw.copy()
      raw1["col4"] = raw1["col4"] < 400
  
      r = from_pandas_df(raw1, chunk_size=(10, 5)).diff(-1)
      pd.testing.assert_frame_equal(r.execute().fetch(), raw1.diff(-1))
  
      r = from_pandas_df(raw1, chunk_size=5).diff(-1)
      pd.testing.assert_frame_equal(r.execute().fetch(), raw1.diff(-1))
  
      r = from_pandas_df(raw, chunk_size=(5, 8)).diff(1, axis=1)
      pd.testing.assert_frame_equal(
          r.execute().fetch(), raw.diff(1, axis=1)
      )
  
      r = from_pandas_df(raw, chunk_size=5).diff(1, axis=1)
      pd.testing.assert_frame_equal(
          r.execute().fetch(), raw.diff(1, axis=1), check_dtype=False
      )
  
      # test series
      s = raw.iloc[:, 0]
      s1 = s.copy() < 400
  
      r = from_pandas_series(s, chunk_size=10).diff(-1)
      pd.testing.assert_series_equal(r.execute().fetch(), s.diff(-1))
  
      r = from_pandas_series(s, chunk_size=5).diff(-1)
      pd.testing.assert_series_equal(r.execute().fetch(), s.diff(-1))
  
      r = from_pandas_series(s1, chunk_size=5).diff(1)
      pd.testing.assert_series_equal(r.execute().fetch(), s1.diff(1))
  
imports: import random
  from collections import OrderedDict
  import numpy
  import pandas
  import pytest
  import mars
  from ....config import options, option_context
  from ....dataframe import DataFrame, Series
  from ....tensor import arange, tensor
  from ....tensor.random import rand
  from ....tests.core import require_cudf
  from ....utils import lazy_import, pd_release_version, no_default
  from ...None import eval, cut, qcut, get_dummies
  from ...core import DATAFRAME_OR_SERIES_TYPE
  from ...datasource.dataframe import from_pandas
  from ...datasource.series import from_pandas
  from ...datasource.index import from_pandas
  from ..None import to_gpu, to_cpu
  from ..bloom_filter import filter_by_bloom_filter
  from ..shift import _enable_no_default, _with_column_freq_bug
  from ..to_numeric import to_numeric
  from ..rebalance import DataFrameRebalance
label_desc: Use image node_id 23 for calling a global function with example usage: test_diff_execution(setup) without return types