src/transformers/models/realm/modeling_realm.py/RealmReaderProjection/__init__
class RealmReaderProjection:    def __init__(self, config):
        super().__init__()
        self.config = config
        self.dense_intermediate = nn.Linear(config.hidden_size, config.span_hidden_size * 2)
        self.dense_output = nn.Linear(config.span_hidden_size, 1)
        self.layer_normalization = nn.LayerNorm(config.span_hidden_size, eps=config.reader_layer_norm_eps)
        self.relu = nn.ReLU()