code: def reset(self):
      self.correct_num = 0
      self.all_num = 0
      self.norm_edit_dis = 0
      self.psnr_result = []
      self.ssim_result = []
  
imports: from math import exp
  import paddle
  import paddle.nn.functional
  import paddle.nn
  import string
label_desc: Use image node_id 2 for calling the SRMetric obj's underlying member method code with example usage: obj.reset() without return types