code: def _get_process_count_per_slice() -> int:
      tpu_worker_hostnames = str(
          os.environ.get("TPU_WORKER_HOSTNAMES", None)
      )
      return len(tpu_worker_hostnames.split(","))
  
imports: from __future__ import annotations
  import os
  import re
  import socket
  import time
  from jax._src import clusters
  from jax._src.cloud_tpu_init import running_in_cloud_tpu_vm
label_desc: Use image node_id 2 for calling the GkeTpuCluster obj's underlying member method code with example usage: obj._get_process_count_per_slice() and returns: len