code: def replacements_data():
      return pd.DataFrame.from_dict(
          {
              "a": ["a", "UNknown", "b"],
              "b": ["", " ", " - "],
              "c": [1, "", 3],
              "d": [1.1, np.nan, 3],
              "e": ["a", np.nan, "b"],
          }
      )
  
file_path: dtale/tests/dtale/test_replacements.py
imports: import json
  import numpy
  import pandas
  import pytest
  import sklearn
  from pkg_resources import parse_version
  from six import PY3
  from dtale.column_replacements import ColumnReplacement
  from tests.dtale.test_views import app
  from tests.dtale import build_data_inst, build_dtypes
label_desc: Use image node_id 1 for calling a global function with example usage: replacements_data() and returns: pd