docstr: Test train entry point with setting state's `stop()` flag
docstr_tok: ["Test","train","entry","point","with","setting","state","'s","`","stop","(",")","`","flag"]
code: def test_train_stop(self) -> None:
      """
      Test train entry point with setting state's `stop()` flag
      """
      input_dim = 2
      dataset_len = 10
      batch_size = 2
      max_epochs = 3
      max_steps_per_epoch = 4
      steps_before_stopping = 2
  
      my_unit = StopTrainUnit(
          input_dim=input_dim,
          steps_before_stopping=steps_before_stopping,
      )
      dataloader = generate_random_dataloader(
          dataset_len, input_dim, batch_size
      )
  
      train(
          my_unit,
          dataloader,
          max_epochs=max_epochs,
          max_steps_per_epoch=max_steps_per_epoch,
      )
  
      self.assertEqual(my_unit.train_progress.num_epochs_completed, 1)
      self.assertEqual(
          my_unit.train_progress.num_steps_completed_in_epoch, 0
      )
      self.assertEqual(
          my_unit.steps_processed,
          my_unit.train_progress.num_steps_completed,
      )
      self.assertEqual(my_unit.steps_processed, steps_before_stopping)
  
imports: import unittest
  from typing import Any, Iterator, Mapping, Tuple
  from unittest.mock import MagicMock
  import torch
  from torch import nn
  from torchtnt.framework._test_utils import DummyTrainUnit, generate_random_dataloader
  from torchtnt.framework.callback import Callback
  from torchtnt.framework.state import State
  from torchtnt.framework.train import train
  from torchtnt.framework.unit import TrainUnit, TTrainUnit
  from torchtnt.utils.timer import Timer
label_desc: Use image node_id 3 for calling the TrainTest obj's underlying member method code with example usage: obj.test_train_stop() without return types