mbart-neutralization

This model is a fine-tuned version of facebook/mbart-large-50 on the hackathon-pln-es/neutral-es dataset.

It learns to paraphrase gender-marked expressions into an inclusive style. For example, "La enfermera me curó" → "El personal sanitario me curó", thereby promoting more inclusive language.

It achieves the following results on the evaluation set:

• Loss: 0.0118
• BLEU: 63.5448
• Generation length: 36.7604

Model description

mBART-50 is a pretrained multilingual encoder–decoder (sequence-to-sequence) model that supports 50 languages. It was designed to show that, instead of fine-tuning a separate model for each language pair, a single pre-trained model can be fine-tuned simultaneously on multiple translation directions. Building on the original mBART, it extends coverage by adding 25 more languages (for a total of 50), delivering a truly multilingual solution.

During pre-training, mBART-50 employs a denoising autoencoding objective: monolingual sentences are “noised” by randomly shuffling their order and span-masking a portion of tokens, and the model learns to reconstruct the original text.

Intended uses

• Reducing gender bias in Spanish texts via monolingual style transfer.

• Preprocessing step in NLP pipelines (e.g. for editorial tools or inclusive content generation).

• As a basis for further fine-tuning on related sequence-to-sequence tasks (summarization, paraphrasing).

Limitations

• Only neutralizes gendered expressions in Spanish; it does not translate between languages.

• Quality may degrade on domain-specific or very technical texts outside the training distribution.

• May occasionally produce ungrammatical or awkward phrasing when forced to alter rare word combinations.

Training hyperparameters

The following hyperparameters were used during training:

• learning_rate: 5.6e-05
• train_batch_size: 8
• eval_batch_size: 8
• seed: 42
• optimizer: Use OptimizerNames.ADAMW_TORCH with betas=(0.9,0.999) and epsilon=1e-08 and optimizer_args=No additional optimizer arguments
• lr_scheduler_type: linear
• num_epochs: 2

Training results

Training Loss	Epoch	Step	Validation Loss	Bleu	Gen Len
No log	1.0	440	0.0151	88.2841	34.8125
0.2281	2.0	880	0.0118	63.5448	36.7604

Framework versions

• Transformers 4.49.0
• Pytorch 2.5.1+cu124
• Datasets 3.3.2
• Tokenizers 0.21.0