class_docstr: Base class for all pytorch metrics
class_docstr_tok: ["Base","class","for","all","pytorch","metrics"]
code: def __call__(self, preds, targets):
      pass
  
imports: import torch
  from abc import ABC, abstractmethod
label_desc: Use image node_id 1 for calling the PytorchMetric obj's underlying member method code with example usage: obj.__call__(preds, targets) without return types