code: def reset(self):
      self.confusion_matrix = np.zeros((self.num_class,) * 2)
  
imports: import os
  import time
  import tqdm
  import numpy
  from PIL import Image
  import paddle
  import paddle.nn.functional
  from paddleseg.utils import metrics, TimeAverager, calculate_eta, logger, progbar
  import datasets
  from utils import save_imgs
label_desc: Use image node_id 10 for calling the Eval obj's underlying member method code with example usage: obj.reset() without return types