src/transformers/models/convbert/modeling_convbert.py/ConvBertForQuestionAnswering/__init__
class ConvBertForQuestionAnswering:    def __init__(self, config):
        super().__init__(config)

        self.num_labels = config.num_labels
        self.convbert = ConvBertModel(config)
        self.qa_outputs = nn.Linear(config.hidden_size, config.num_labels)

        # Initialize weights and apply final processing
        self.post_init()