code: def read_pid_server_addr(
      addr: str,
  ) -> Union[str, int, Tuple[str, int]]:
      """
      Read a string for specifying either a unix socket, a port number, or a host:port string.
  
      Used by both the pid_server and pid_client helper scripts.
      """
      if "/" in addr:
          # Unix socket.
          return addr
      if ":" in addr:
          # Host:port string.
          parts = addr.split(":")
          host = ":".join(parts[:-1])
          port = int(parts[-1])
          return host, port
      try:
          return int(addr)
      except ValueError:
          pass
      raise ValueError(
          "'{addr}' is not a valid address spec; it should be a path to a unix socket (with at least "
          "one '/'), a host:port string, or a port number"
      )
  
imports: import logging
  import os
  import selectors
  import signal
  import socket
  import subprocess
  import time
  from typing import Any, Callable, Dict, List, Optional, Tuple, Union
  import determined
label_desc: Use image node_id 1 for calling a global function with example usage: read_pid_server_addr(addr) and returns: addr, host,  port, int