code: def corpus(self, tasks_base_path):
      return ColumnCorpus(
          data_folder=tasks_base_path / "conllu",
          train_file="train.conllup",
          dev_file="train.conllup",
          test_file="train.conllup",
          column_format={1: "text", 2: "pos", 3: "ner"},
      )
  
file_path: flair/tests/models/test_relation_extractor.py
imports: import pytest
  from flair.data import Sentence
  from flair.datasets import ColumnCorpus
  from flair.embeddings import TransformerWordEmbeddings
  from flair.models import RelationExtractor
  from tests.model_test_utils import BaseModelTest
label_desc: Use image node_id 1 for calling the TestRelationExtractor obj's underlying member method code with example usage: obj.corpus(tasks_base_path) and returns: ColumnCorpus