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README.md

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+---
+language: en
+license: mit
+pipeline_tag: text-classification
+library_name: transformers
+tags:
+  - spam
+  - ham
+  - email
+  - tinybert
+  - enron
+  - text-classification
+model-index:
+  - name: prancyFox/tiny-bert-enron-spam
+    results:
+      - task:
+          type: text-classification
+          name: Spam / Ham Classification
+        dataset:
+          name: Enron (processed CSV)
+          type: enron_email
+          split: test
+        metrics:
+          - name: F1 (macro)
+            type: f1
+            value: 0.7666
+          - name: ROC-AUC
+            type: roc_auc
+            value: 0.9977
+          - name: Precision (spam)
+            type: precision
+            value: 0.9954
+          - name: Recall (spam)
+            type: recall
+            value: 0.5632
+          - name: Precision (ham)
+            type: precision
+            value: 0.6875
+          - name: Recall (ham)
+            type: recall
+            value: 0.9973
+base_model: huawei-noah/TinyBERT_General_4L_312D
+---
+
+# TinyBERT Spam Classifier (Enron)
+
+A compact **TinyBERT (4-layer, 312 hidden)** model fine-tuned to classify **email text** as **spam** or **ham**.  
+Trained on an Enron-derived CSV with light email-specific cleaning (e.g., removing quoted lines and base64-like blobs).  
+Optimized for **low false positives** by default; adjust the decision threshold if you want higher spam recall.
+
+> Labels: `ham` (0) and `spam` (1)
+
+---
+
+## ✨ Quick Start
+
+```python
+from transformers import pipeline
+
+clf = pipeline(
+    "text-classification",
+    model="prancyFox/tiny-bert-enron-spam",
+    truncation=True  # recommended for long emails
+)
+
+clf("Congratulations! You won a FREE iPhone. Click here now!")
+# [{'label': 'spam', 'score': 0.98}]
+````
+
+**Batch inference**
+
+```python
+texts = [
+    "Meeting moved to 3pm, see agenda attached.",
+    "FREE gift card!!! Act now!",
+]
+preds = clf(texts, truncation=True)
+```
+
+---
+
+## 🔎 Intended Use & Limitations
+
+**Intended use**
+
+* Classifying **email bodies (and optionally subject+body)** as spam vs ham.
+* Low-latency scenarios where a small model is preferred.
+
+**Out of scope / Limitations**
+
+* Non-English email content may reduce accuracy.
+* Long threads with heavy quoting/footers can dilute signal (use truncation + cleaning).
+* Trained on Enron-style corporate emails; consumer emails may differ (consider further fine-tuning).
+
+---
+
+## 🧰 How We Preprocessed the Data
+
+Light normalization aimed at keeping semantic content:
+
+* Remove long base64-like blobs.
+* Drop quoted lines starting with `>` or `|`.
+* Optional: concatenate `Subject + "\n" + Message` when available.
+* Collapse repeated whitespace.
+
+(You can replicate similar cleaning in your serving pipeline for alignment.)
+
+---
+
+## 🏋️ Training Details
+
+* **Base model:** `huawei-noah/TinyBERT_General_4L_312D`
+* **Task:** Binary text classification (`ham`=0, `spam`=1)
+* **Tokenizer:** fast BERT tokenizer (uncased)
+* **Max length:** 256 tokens
+* **Optimizer / LR:** AdamW, learning rate `2e-5 – 5e-5` (final run `3e-5`)
+* **Batch size:** 32
+* **Epochs:** 4 (early stopping enabled)
+* **Warmup:** 10%
+* **Weight decay:** 0.01
+* **Loss:** Cross-entropy with class weighting (ham/spam balanced from label distribution). Focal loss available in the trainer.
+* **Early stopping metric:** `eval_f1`
+* **Best checkpoint:** Saved using evaluation on validation set.
+
+> Trainer script: `train/train_tinybert.py` (TinyBERT-compatible, with legacy HF support shims).
+
+---
+
+## 📊 Evaluation (Chunked Benchmark Summary)
+
+Metrics below reflect a **chunked evaluation** pass (used for long emails), where the model sees up to 512 tokens per chunk with overlap. Threshold tuned to minimize false positives:
+
+### Classification Report
+
+|         Class |  Precision |     Recall |         F1 |
+| ------------: | ---------: | ---------: | ---------: |
+|           ham |     0.6875 |     0.9973 |     0.8139 |
+|          spam |     0.9954 |     0.5632 |     0.7194 |
+| **macro avg** | **0.8414** | **0.7802** | **0.7666** |
+
+* **ROC-AUC:** 0.9977
+
+**Confusion matrix**
+
+```
+[[16500    45]
+ [ 7500  9671]]
+```
+
+**Interpretation:** The model is conservative (very few false positives on ham). If you need to catch more spam, **lower the decision threshold** (e.g., from 0.5 → 0.35) or re-train with a spam-skewed class weight / focal loss.
+
+---
+
+## 🎛️ Threshold & Long-Email Guidance
+
+* **Threshold:** Default is 0.5. For higher spam recall, try **0.35–0.45** and evaluate impact on false positives.
+* **Long emails:** For multi-paragraph threads, consider **chunking** and aggregating chunk-level spam scores (e.g., max or average). Our reference app uses 512-token chunks with overlap.
+
+---
+
+## 🧪 Reproducibility
+
+**Environment**
+
+* Python 3.10/3.11
+* `transformers >= 4.40`
+* `datasets >= 2.20`
+* `evaluate >= 0.4.2`
+* `torch >= 2.1`
+
+**Training command (example)**
+
+```bash
+python train/train_tinybert.py \
+  --train data/enron.csv \
+  --text_col Message --label_col "Spam/Ham" \
+  --output_dir outputs/tiny-bert-enron-spam \
+  --epochs 4 --batch_size 32 --lr 3e-5 \
+  --max_length 256 --fp16
+```
+
+**Serving (FastAPI example)**
+
+```bash
+python spam_bert.py --serve \
+  --model prancyFox/tiny-bert-enron-spam \
+  --model-cache-dir ./models_cache
+```
+
+---
+
+## 📁 Files
+
+This repo should include:
+
+* `config.json`
+* `pytorch_model.bin` or `model.safetensors`
+* `tokenizer.json` and `tokenizer_config.json` (or `vocab.txt` etc.)
+* `README.md` (this file)
+* (Optional) `label_mapping.json` with `{"ham": 0, "spam": 1}`
+
+---
+
+## ⚖️ License
+
+* **Model weights & code**: MIT
+* **Dataset**: Check the original Enron dataset/license terms before redistribution.
+
+---
+
+## 🔬 Ethical Considerations & Risks
+
+* False positives can have operational cost (missed legitimate emails). This model is tuned to minimize them; if you change the threshold, validate carefully.
+* Spam evolves. Periodically re-train with fresh samples to maintain accuracy.
+* Non-English or code-mixed content may degrade performance.
+
+---
+
+## 🧩 Citation
+
+If you use this model, please cite:
+
+```
+@software{tinybert_enron_spam_2025,
+  title        = {TinyBERT Spam Classifier (Enron)},
+  author       = {Ing. Daniel Eder},
+  year         = {2025},
+  url          = {https://huggingface.co/prancyFox/tiny-bert-enron-spam}
+}
+```
+
+And the TinyBERT paper:
+
+```
+@article{jiao2020tinybert,
+  title={TinyBERT: Distilling BERT for Natural Language Understanding},
+  author={Jiao, Xiaoqi and Yin, Yichun and others},
+  journal={Findings of EMNLP},
+  year={2020}
+}
+```
+
+---
+
+## 🛠 Maintainers
+
+* **Daniel Eder** ([daniel@deder.at](mailto:daniel@deder.at?subject=tiny-bert-enron-spam))
+
+---
+
+### Notes
+
+* For a higher-recall variant, fine-tune with `--use_focal_loss` or increase the spam class weight, then re-evaluate thresholds.
+* If you want a **PyTorch Lightning** or **Accelerate** training variant, \~it’s easy to adapt the provided trainer.

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