code: def setUp(self):
      self.data = SessionTSVDataSource(
          SafeFileWrapper(
              tests_module.test_file("seq_tagging_example.tsv")
          ),
          field_names=["session_id", "intent", "goals", "label"],
          schema={
              "intent": List[str],
              "goals": List[str],
              "label": List[str],
          },
      )
  
imports: import unittest
  from typing import List
  from pytext.data.sources.data_source import SafeFileWrapper
  from pytext.data.sources.tsv import BlockShardedTSVDataSource, SessionTSVDataSource, TSVDataSource
  from pytext.utils.test import import_tests_module
label_desc: Use image node_id 1 for calling the SessionTSVDataSourceTest obj's underlying member method code with example usage: obj.setUp() without return types