code: def get_test_df():
      temp = tempfile.NamedTemporaryFile(mode="w+")
      temp.write(CSV_CONTENT)
      temp.seek(0)
      ds = read_csv(temp.name, dtype=None)
      df = dd.from_pandas(ds, npartitions=1)
      return df
  
imports: import tempfile
  import pytest
  from ludwig.constants import TEXT
  from ludwig.utils.data_utils import read_csv
label_desc: Use image node_id 1 for calling a global function with example usage: get_test_df() and returns: df