src/transformers/models/mmbt/configuration_mmbt.py/MMBTConfig/__init__
class MMBTConfig:    def __init__(self, config, num_labels=None, modal_hidden_size=2048):
        self.__dict__ = config.__dict__
        self.modal_hidden_size = modal_hidden_size
        if num_labels:
            self.num_labels = num_labels