code: def test__flatness_scheduler(self):
      # test with arguments values
      f = self.trainer._flatness_scheduler(epoch=10)
      expected_flatness = 0.03
      self.assertTrue(f == expected_flatness)
  
      # test with specified values
      self.trainer.flatness["increase"] = 0.1
      self.trainer.flatness["increase_frequency"] = 2
      self.trainer.flatness["min"] = 0.1
      self.trainer.flatness["max"] = 1.0
      f = self.trainer._flatness_scheduler(epoch=10)
      expected_flatness = 0.6
      self.assertTrue(f == expected_flatness)
  
      # test max
      self.trainer.flatness["increase"] = 1.0
      self.trainer.flatness["increase_frequency"] = 1
      self.trainer.flatness["min"] = 0.1
      self.trainer.flatness["max"] = 1.0
      f = self.trainer._flatness_scheduler(epoch=10)
      expected_flatness = 1.0
      self.assertTrue(f == expected_flatness)
  
imports: import logging
  import os
  import shutil
  import unittest
  from copy import copy
  from pathlib import Path
  import yaml
  import numpy
  from unittest.mock import patch, Mock
  from ISR.models.cut_vgg19 import Cut_VGG19
  from ISR.models.discriminator import Discriminator
  from ISR.models.rrdn import RRDN
  from ISR.train.trainer import Trainer
label_desc: Use image node_id 7 for calling the TrainerClassTest obj's underlying member method code with example usage: obj.test__flatness_scheduler() without return types