src/transformers/models/ibert/modeling_ibert.py/IBertForMaskedLM/__init__
class IBertForMaskedLM:    def __init__(self, config):
        super().__init__(config)

        self.ibert = IBertModel(config, add_pooling_layer=False)
        self.lm_head = IBertLMHead(config)

        self.init_weights()