code: def set_epoch(self, epoch: int):
      self.epoch = epoch
  
file_path: PaddleOCR/ppocr/data/multi_scale_sampler.py
imports: from paddle.io import Sampler
  import paddle.distributed
  import numpy
  import random
  import math
label_desc: Use image node_id 4 for calling the MultiScaleSampler obj's underlying member method code with example usage: obj.set_epoch(epoch) without return types