Created by: pengwangucla

related to issue #2107 (closed) In paddle.infer, it concatenate different output of the same field as follow:

    def infer(self, input, field='value', **kwargs):
        """
        Infer a data by model.
        :param input: input data batch. Should be python iterable object.
        :param field: output field.
        """
        retv = None
        kwargs['input'] = input
        for result in self.iter_infer_field(field=field, **kwargs):
            if retv is None:
                retv = [[] for i in xrange(len(result))]
            for i, item in enumerate(result):
                retv[i].append(item)
  >      retv = [numpy.concatenate(out) for out in retv]
        if len(retv) == 1:
            return retv[0]
        else:
            return retv

Why you need to concatenate it ? Can it be done with a 2 d list or a list of dictionary ? So that you don't need to require the shape of each output to be exactly the same ?

@reyoung