code: def value_per_key_within_tolerance(expected, actual, tolerance):
      return (
          actual[0] == expected[0]
          and abs(actual[1] - expected[1]) <= tolerance
      )
  
imports: import unittest
  import apache_beam
  from apache_beam.runners.portability import fn_api_runner
  from apache_beam import pvalue
  from unittest.mock import patch
  import apache_beam.testing.util
  from apache_beam.testing.test_pipeline import TestPipeline
  import pipeline_dp
  from pipeline_dp import private_beam
  from pipeline_dp import aggregate_params, budget_accounting
label_desc: Use image node_id 2 for calling the PrivateBeamTest obj's underlying member method code with example usage: obj.value_per_key_within_tolerance(expected, actual, tolerance) and returns: unknown