class_docstr: DistillationSerPostProcess
class_docstr_tok: ["DistillationSerPostProcess"]
code: def __call__(self, preds, batch=None, *args, **kwargs):
      output = dict()
      for name in self.model_name:
          pred = preds[name]
          if self.key is not None:
              pred = pred[self.key]
          output[name] = super().__call__(
              pred, batch=batch, *args, **kwargs
          )
      return output
  
file_path: PaddleOCR/ppocr/postprocess/vqa_token_ser_layoutlm_postprocess.py
imports: import numpy
  import paddle
  from ppocr.utils.utility import load_vqa_bio_label_maps
label_desc: Use image node_id 2 for calling the DistillationSerPostProcess obj's underlying member method code with example usage: obj.__call__(preds, batch) and returns: output