code: def node_tags(self, node_id):
      if node_id is None:
          # Circumvent test cases where there's no head node.
          return {}
      # Don't assume that node providers can retrieve tags from
      # terminated nodes.
      if self.is_terminated(node_id):
          raise Exception(
              f"The node with id {node_id} has been terminated!"
          )
      with self.lock:
          return self.mock_nodes[node_id].tags
  
imports: import re
  import threading
  from subprocess import CalledProcessError
  from typing import Callable, Dict, List, Optional
  from ray.autoscaler.node_provider import NodeProvider
label_desc: Use image node_id 6 for calling the MockProvider obj's underlying member method code with example usage: obj.node_tags(node_id) and returns: dict, self