src/transformers/models/realm/modeling_realm.py/RealmScorerProjection/__init__
class RealmScorerProjection:    def __init__(self, config):
        super().__init__()
        self.predictions = RealmLMPredictionHead(config)
        self.dense = nn.Linear(config.hidden_size, config.retriever_proj_size)
        self.LayerNorm = nn.LayerNorm(config.retriever_proj_size, eps=config.layer_norm_eps)