code: def call_variants_command(
      outfile: str,
      examples: str,
      model_ckpt: str,
      extra_args: str,
      use_slim_model: bool = False,
  ) -> Tuple[str, Optional[str]]:
      """Returns a call_variants (command, logfile) for subprocess."""
      binary_name = "call_variants"
      if use_slim_model:
          binary_name = "call_variants_slim"
      command = ["time", f"/opt/deepvariant/bin/{binary_name}"]
      command.extend(["--outfile", '"{}"'.format(outfile)])
      command.extend(["--examples", '"{}"'.format(examples)])
      command.extend(["--checkpoint", '"{}"'.format(model_ckpt)])
      if extra_args and "use_openvino" in extra_args:
          raise RuntimeError(
              "OpenVINO is not installed by default in DeepVariant "
              "Docker images. Please rerun without use_openvino flag."
          )
      # Extend the command with all items in extra_args.
      command = _extend_command_by_args_dict(
          command, _extra_args_to_dict(extra_args)
      )
      logfile = None
      if _LOGGING_DIR.value:
          logfile = "{}/{}.log".format(_LOGGING_DIR.value, binary_name)
      return (" ".join(command), logfile)
  
imports: import os
  import subprocess
  import sys
  import tempfile
  from typing import Any, Dict, Optional, Tuple
  from absl import app
  from absl import flags
  from absl import logging
  import tensorflow
label_desc: Use image node_id 8 for calling a global function with example usage: call_variants_command(outfile, examples, model_ckpt, extra_args, use_slim_model) and returns: str,  logfile