class_docstr: Builds an address for Vertex AI.
code: def build(self) -> str:
      cluster_spec = os.environ.get("CLUSTER_SPEC", None)
      return (
          json.loads(cluster_spec)
          .get("cluster")
          .get(self._cluster)[self._instance]
      )
  
file_path: launchpad/launchpad/nodes/python/addressing.py
imports: import collections
  import itertools
  import json
  import os
  import typing
  from typing import Any, List, Optional
  from absl import flags
  from absl import logging
  from launchpad import address
  from launchpad import flags
label_desc: Use image node_id 2 for calling the VertextAiAddressBuilder obj's underlying member method code with example usage: obj.build() and returns: json