code: def init_sum_missing(self):
      self.sum_missing = ivy.zeros(
          (self.n_outputs, self.max_n_classes), dtype=ivy.float64
      )
  
imports: from abc import ABC, abstractmethod
  import ivy
label_desc: Use image node_id 3 for calling the ClassificationCriterion obj's underlying member method code with example usage: obj.init_sum_missing() without return types