code: def avg_log_prob(self):
      return sum(self.log_probs) / len(self.log_probs)
  
imports: from copy import deepcopy
  import torch
  import torch.nn
  from graph4nlp.pytorch.modules.prediction.generation.base import DecoderBase
label_desc: Use image node_id 4 for calling the Hypothesis obj's underlying member method code with example usage: obj.avg_log_prob() and returns: unknown