code: def __init__(self, num_workers: int = 1):
      self.num_workers = num_workers
  
file_path: ray/python/ray/tests/gcp/test_gcp_tpu_command_runner.py
imports: import pytest
  import os
  from ray.tests.test_autoscaler import MockProvider, MockProcessRunner
  from ray.autoscaler._private.gcp.tpu_command_runner import TPUCommandRunner
  from ray.autoscaler._private.command_runner import SSHCommandRunner
  from ray._private import ray_constants
  from getpass import getuser
  import hashlib
  from unittest.mock import patch
label_desc: Use image node_id 1 to create a new MockTpuInstance object  with example: obj = MockTpuInstance(num_workers)