code: def encode(inp, result, protocol="json"):
      """encode (MeasureInput, MeasureResult) pair to a string
  
      Parameters
      ----------
      inp: autotvm.measure.MeasureInput
      result: autotvm.measure.MeasureResult
          pair of input/result
      protocol: str
          log protocol, json or pickle
  
      Returns
      -------
      row: str
          a row in the logger file
      """
  
      if protocol == "json":
          json_dict = {
              "input": (
                  str(inp.target),
                  inp.task.name,
                  inp.task.args,
                  inp.task.kwargs,
              ),
              "config": inp.config.to_json_dict(),
              "result": (
                  result.costs if result.error_no == 0 else (1e9,),
                  result.error_no,
                  result.all_cost,
                  result.timestamp,
              ),
              "version": AUTOTVM_LOG_VERSION,
              "tvm_version": __version__,
          }
          return json.dumps(json_dict)
      if protocol == "pickle":
          row = (
              str(inp.target),
              str(
                  base64.b64encode(
                      pickle.dumps(
                          [
                              inp.task.name,
                              inp.task.args,
                              inp.task.kwargs,
                          ]
                      )
                  ).decode()
              ),
              str(base64.b64encode(pickle.dumps(inp.config)).decode()),
              str(
                  base64.b64encode(pickle.dumps(tuple(result))).decode()
              ),
              str(AUTOTVM_LOG_VERSION),
              str(__version__),
          )
          return "\t".join(row)
  
      raise RuntimeError("Invalid log protocol: " + protocol)
  
imports: import argparse
  import base64
  from io import TextIOBase
  import logging
  import pickle
  import json
  import time
  from typing import Union
  import os
  import itertools
  from collections import OrderedDict
  import numpy
  from ..None import build, lower
  from ..target import Target
  from ..contrib import popen_pool
  from ..None import __version__
  from .None import task
  from .task import ConfigEntity, ApplyHistoryBest
  from .measure import MeasureInput, MeasureResult
label_desc: Use image node_id 2 for calling a global function with example usage: encode(inp, result, protocol) and returns: json, str