code: def _get_comparisons_as_json(comparisons):
      buf = StringIO()
      for comparator in comparisons:
          json.dump(comparator, buf, cls=JsonEncoder)
          buf.write("\n")
  
      return buf.getvalue()
  
imports: from collections import namedtuple
  from io import StringIO
  import click
  import json
  import logging
  import os
  import pathlib
  import sys
  from .benchmark.codec import JsonEncoder
  from .benchmark.compare import RunnerComparator, DEFAULT_THRESHOLD
  from .benchmark.runner import CppBenchmarkRunner, JavaBenchmarkRunner
  from .compat import _import_pandas
  from .lang.cpp import CppCMakeDefinition, CppConfiguration
  from .utils.cli import ArrowBool, validate_arrow_sources, add_optional_command
  from .utils.lint import linter, python_numpydoc, LintValidationException
  from .utils.logger import logger, ctx
  from .utils.source import ArrowSources
  from .utils.tmpdir import tmpdir
label_desc: Use image node_id 16 for calling a global function with example usage: _get_comparisons_as_json(comparisons) and returns: buf