src/transformers/models/dpr/modeling_dpr.py/DPRPretrainedReader/init_weights
class DPRPretrainedReader:    def init_weights(self):
        self.span_predictor.encoder.init_weights()
        self.span_predictor.qa_classifier.apply(self.span_predictor.encoder.bert_model._init_weights)
        self.span_predictor.qa_outputs.apply(self.span_predictor.encoder.bert_model._init_weights)