models/roberta_model.py

import torch
import torch.nn as nn
from transformers import RobertaModel
from config import DROPOUT_RATE, ROBERTA_MODEL_NAME

class RobertaMultiOutputModel(nn.Module):
    tokenizer_name = ROBERTA_MODEL_NAME

    def __init__(self, num_labels):
        super(RobertaMultiOutputModel, self).__init__()
        self.roberta = RobertaModel.from_pretrained(ROBERTA_MODEL_NAME)
        self.dropout = nn.Dropout(DROPOUT_RATE)
        self.classifiers = nn.ModuleList([
            nn.Linear(self.roberta.config.hidden_size, n_classes) for n_classes in num_labels
        ])

    def forward(self, input_ids, attention_mask):
        pooled_output = self.roberta(input_ids=input_ids, attention_mask=attention_mask).pooler_output
        pooled_output = self.dropout(pooled_output)
        return [classifier(pooled_output) for classifier in self.classifiers]