docstr: Test BaseCSVWriter callback that creates file from single list with predict
docstr_tok: ["Test","BaseCSVWriter","callback","that","creates","file","from","single","list","with","predict"]
code: def test_csv_writer_single_row(self) -> None:
      """
      Test BaseCSVWriter callback that creates file from single list with predict
      """
      input_dim = 2
      dataset_len = 10
      batch_size = 2
  
      my_unit = DummyPredictUnit(2)
      dataloader = generate_random_dataloader(
          dataset_len, input_dim, batch_size
      )
  
      with tempfile.TemporaryDirectory() as temp_dir:
          csv_callback = CustomCSVWriterSingleRow(
              header_row=_HEADER_ROW,
              dir_path=temp_dir,
              filename=_FILENAME,
          )
          predict(my_unit, dataloader, callbacks=[csv_callback])
  
          # Check file exists and is successfully opened
          csv_file = f"{temp_dir}/{_FILENAME}"
          self.assertEqual(csv_callback.output_path, csv_file)
          self.assertIsNotNone(csv_callback._file)
  
file_path: tnt/tests/framework/callbacks/test_csv_writer.py
imports: import tempfile
  import unittest
  from typing import Any, List, Union
  from torchtnt.framework._test_utils import DummyPredictUnit, generate_random_dataloader
  from torchtnt.framework.callbacks.base_csv_writer import BaseCSVWriter
  from torchtnt.framework.predict import predict
  from torchtnt.framework.state import State
  from torchtnt.framework.unit import PredictUnit, TPredictData
label_desc: Use image node_id 2 for calling the BaseCSVWriterTest obj's underlying member method code with example usage: obj.test_csv_writer_single_row() without return types