code: def _get_valid_linear_config(self):
      return {
          "name": "composite",
          "schedulers": [
              {"name": "linear", "start_value": 0.0, "end_value": 0.5},
              {"name": "linear", "start_value": 0.5, "end_value": 1.0},
          ],
          "lengths": [0.5, 0.5],
          "interval_scaling": ["rescaled", "rescaled"],
      }
  
file_path: ClassyVision/test/optim_param_scheduler_composite_test.py
imports: import copy
  import unittest
  from classy_vision.optim.param_scheduler import build_param_scheduler
  from classy_vision.optim.param_scheduler.composite_scheduler import CompositeParamScheduler, IntervalScaling, UpdateInterval
label_desc: Use image node_id 4 for calling the TestCompositeScheduler obj's underlying member method code with example usage: obj._get_valid_linear_config() and returns: dict