class_docstr: Tracker client session.
  
  Parameters
  ----------
  addr : tuple
      The address tuple
class_docstr_tok: ["Tracker","client","session",".","Parameters","--","--","--","--","--","addr",":","tuple","The","address","tuple"]
code: def _connect(self):
      self._sock = base.connect_with_retry(self._addr)
      self._sock.sendall(struct.pack("<i", base.RPC_TRACKER_MAGIC))
      magic = struct.unpack("<i", base.recvall(self._sock, 4))[0]
      if magic != base.RPC_TRACKER_MAGIC:
          raise RuntimeError(f"{str(self._addr)} is not RPC Tracker")
  
imports: import os
  import socket
  import stat
  import struct
  import time
  import tvm._ffi
  from tvm._ffi.base import TVMError
  from tvm.contrib import utils
  from tvm.runtime import ndarray
  from tvm._ffi.runtime_ctypes import Device
  from .None import _ffi_api, base, server
label_desc: Use image node_id 3 for calling the TrackerSession obj's underlying member method code with example usage: obj._connect() without return types