code: def __call__(self, preds, batch, **kwargs):
      assert isinstance(preds, dict)
      if self.metrics is None:
          self._init_metrcis(preds)
      output = dict()
      for key in preds:
          self.metrics[key].__call__(preds[key], batch, **kwargs)
  
file_path: PaddleOCR/ppocr/metrics/distillation_metric.py
imports: import importlib
  import copy
  from .rec_metric import RecMetric
  from .det_metric import DetMetric
  from .e2e_metric import E2EMetric
  from .cls_metric import ClsMetric
  from .vqa_token_ser_metric import VQASerTokenMetric
  from .vqa_token_re_metric import VQAReTokenMetric
label_desc: Use image node_id 3 for calling the DistillationMetric obj's underlying member method code with example usage: obj.__call__(preds, batch) without return types