code: def compute_mat(self, query_emb, ref_emb):
      raise NotImplementedError
  
file_path: pytorch-metric-learning/src/pytorch_metric_learning/distances/base_distance.py
imports: import torch
  from ..utils.module_with_records import ModuleWithRecords
label_desc: Use image node_id 3 for calling the BaseDistance obj's underlying member method code with example usage: obj.compute_mat(query_emb, ref_emb) without return types