src/transformers/models/roberta_prelayernorm/modeling_roberta_prelayernorm.py/RobertaPreLayerNormClassificationHead/__init__
class RobertaPreLayerNormClassificationHead:    def __init__(self, config):
        super().__init__()
        self.dense = nn.Linear(config.hidden_size, config.hidden_size)
        classifier_dropout = (
            config.classifier_dropout if config.classifier_dropout is not None else config.hidden_dropout_prob
        )
        self.dropout = nn.Dropout(classifier_dropout)
        self.out_proj = nn.Linear(config.hidden_size, config.num_labels)