src/transformers/models/mpnet/modeling_mpnet.py/MPNetForQuestionAnswering/__init__
class MPNetForQuestionAnswering:    def __init__(self, config):
        super().__init__(config)

        self.num_labels = config.num_labels
        self.mpnet = MPNetModel(config, add_pooling_layer=False)
        self.qa_outputs = nn.Linear(config.hidden_size, config.num_labels)

        self.init_weights()