Repository: transformers
Issue: Enhancing RoBERTa Robustness through Adversarial Training
Labels: Feature request

### Feature request

The goal of this feature is to implement Adversarial Training for the RoBERTa model to enhance its robustness against adversarial examples. Adversarial training involves generating perturbed inputs (adversarial examples) during the training phase, allowing the model to learn how to withstand such attacks. This improves the model's generalization and performance on unseen data.

# Implementation Overview:

### **Adversarial Example Generation:** 

1. Methods: Utilize techniques like FGSM (Fast Gradient Sign Method) or PGD (Projected Gradient Descent) 

2. Integration: Modify the training loop to incorporate a step that generates adversarial examples for each batch of data.

 Loss Function Adjustment:

Combine the traditional loss (e.g., cross-entropy) with a loss calculated on the adversarial examples. This can be done using a weighted sum to balance the two components.

Training Procedure:

Modify the training loop:

For each epoch:

1. Generate adversarial examples from the input batch.
2. Compute the loss on both clean and adversarial examples.
3. Update the model weights based on the combined loss.


***Hyperparameter Tuning:***

Introduce parameters such as the adversarial strength (epsilon) and the weighting factor (
𝜆
λ) to adjust the training dynamics and effectiveness.

### Evaluation Metrics:

Evaluate model performance using metrics like accuracy, precision, recall, and F1-score on both clean and adversarial datasets to measure the robustness improvements.

# Link to Paper:

[Adversarial Training for Natural Language Processing](https://arxiv.org/abs/1906.05955)
[Adversarial Examples for Evaluating Reading Comprehension Systems](https://arxiv.org/abs/1904.07236)
[Adversarial Training for Large Neural Language Models](https://arxiv.org/abs/1909.03247)
[Towards Robustness Against Adversarial Attacks in Natural Language Processing](https://arxiv.org/abs/2002.07677)
[Adversarial Training with Natural Language Processing](https://arxiv.org/abs/2103.09582)

### Motivation

The motivation for this feature arises from the increasing importance of model robustness in real-world applications. Many NLP models, including RoBERTa, are vulnerable to adversarial attacks that can lead to significant performance degradation.

Real-World Applications: In critical applications like sentiment analysis, spam detection, or other classification tasks, adversarial inputs can lead to serious consequences, such as misclassification of malicious content.

Frustration with Current Limitations: I often find that while RoBERTa performs excellently on clean datasets, its inability to generalize against adversarial examples hampers its deployment in production. This feature aims to address that gap.



### Your contribution

I would like to contribute to the implementation of adversarial training for the RoBERTa model to enhance its robustness against adversarial attacks. I have reviewed the CONTRIBUTING.md file and am familiar with the contribution guidelines.

# I plan to:

Implement adversarial training techniques based on insights from the relevant research papers.

[**1**] Create test cases to validate the effectiveness of the adversarial training implementation.

[**2**] Update the documentation to include usage examples and instructions for leveraging this feature.

I am excited to submit a Pull Request (PR) once the implementation is complete and ensure it aligns with the project standards.