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

        self.convbert = ConvBertModel(config)
        self.sequence_summary = SequenceSummary(config)
        self.classifier = nn.Linear(config.hidden_size, 1)

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