HW1 HC3 Detector
Fine-tuned sentence-transformers/all-MiniLM-L6-v2 to classify HC3 answers.
Labels: 0 = human, 1 = ChatGPT. Input: answer text only.
| Model | Test accuracy |
|---|---|
| Frozen embeddings + logistic regression | 0.8449 |
| Fine-tuned classifier | 0.9874 |
Training: 5 epochs, AdamW, learning rate 2e-5, batch size 32, max length 256.
Dataset: Hello-SimpleAI/HC3 (English), split by question with seed 42.
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