dcarpintero/pangolin-guard-base

PangolinGuard-Base

LLM applications face critical security challenges in form of prompt injections and jailbreaks. This can result in models leaking sensitive data or deviating from their intended behavior. Existing safeguard models are not fully open and have limited context windows (e.g., only 512 tokens in LlamaGuard).

Pangolin Guard is a ModernBERT (Base), lightweight model that discriminates malicious prompts (i.e. prompt injection attacks).

🤗 Tech-Blog | GitHub Repo

Intended Use Cases

• Adding a self-hosted, inexpensive defense mechanism against prompt injection attacks to AI agents and conversational interfaces.

Evaluation Data

Evaluated on unseen data from a subset of specialized benchmarks targeting prompt safety and malicious input detection, while testing over-defense behavior:

• NotInject: Designed to measure over-defense in prompt guard models by including benign inputs enriched with trigger words common in prompt injection attacks.
• BIPIA: Evaluates privacy invasion attempts and boundary-pushing queries through indirect prompt injection attacks.
• Wildguard-Benign: Represents legitimate but potentially ambiguous prompts.
• PINT: Evaluates particularly nuanced prompt injection, jailbreaks, and benign prompts that could be misidentified as malicious.

Inference

from transformers import pipeline

classifier = pipeline("text-classification", "dcarpintero/pangolin-guard-base")
text = "your input text"
output = classifier(text)

Training Procedure

Training Hyperparameters

The following hyperparameters were used during training:

• learning_rate: 5e-05
• train_batch_size: 64
• eval_batch_size: 32
• seed: 42
• optimizer: Use OptimizerNames.ADAMW_TORCH_FUSED 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	F1	Accuracy
0.1622	0.1042	100	0.0755	0.9604	0.9741
0.0694	0.2083	200	0.0525	0.9735	0.9828
0.0552	0.3125	300	0.0857	0.9696	0.9810
0.0535	0.4167	400	0.0345	0.9825	0.9889
0.0371	0.5208	500	0.0343	0.9821	0.9887
0.0402	0.625	600	0.0344	0.9836	0.9894
0.037	0.7292	700	0.0282	0.9869	0.9917
0.0265	0.8333	800	0.0229	0.9895	0.9933
0.0285	0.9375	900	0.0240	0.9885	0.9926
0.0191	1.0417	1000	0.0220	0.9908	0.9941
0.0134	1.1458	1100	0.0228	0.9911	0.9943
0.0124	1.25	1200	0.0230	0.9898	0.9935
0.0136	1.3542	1300	0.0212	0.9910	0.9943
0.0088	1.4583	1400	0.0229	0.9911	0.9943
0.0115	1.5625	1500	0.0211	0.9922	0.9950
0.0058	1.6667	1600	0.0233	0.9920	0.9949
0.0119	1.7708	1700	0.0199	0.9916	0.9946
0.0072	1.875	1800	0.0206	0.9925	0.9952
0.007	1.9792	1900	0.0196	0.9923	0.9950

Framework versions

• Transformers 4.50.0
• Pytorch 2.6.0+cu124
• Datasets 3.4.1
• Tokenizers 0.21.1