class_docstr: Stack several learning rate schedulers.
  
  :param iterationPerEpoch: iteration numbers per epoch
  
  >>> sequentialSchedule = SequentialSchedule(5)
  creating: createSequentialSchedule
  >>> poly = Poly(0.5, 2)
  creating: createPoly
  >>> test = sequentialSchedule.add(poly, 5)
code: def get_scheduler(self) -> "optimizer.SequentialSchedule":
      return self.scheduler
  
imports: from abc import ABC, abstractmethod
  from typing import List, Optional, TYPE_CHECKING
label_desc: Use image node_id 2 for calling the SequentialSchedule obj's underlying member method code with example usage: obj.get_scheduler() and returns: self