---
license: mit
language:
  - en
tags:
  - intent-classification
  - tinybert
  - cnn
  - education
  - nlp
pipeline_tag: text-classification
---

# IntentClassifier — TinyBERT-CNN

A lightweight intent classification model for educational AI tutoring systems. Built on **TinyBERT** (huawei-noah/TinyBERT_General_4L_312D) with a **CNN classification head**, optimized for real-time student intent detection.

## Model Description

This model classifies student utterances into 5 pedagogical intent categories:

| Label ID | Intent | Description |
|----------|--------|-------------|
| 0 | **On-Topic Question** | Questions related to the current learning material |
| 1 | **Off-Topic Question** | Questions unrelated to the current topic |
| 2 | **Emotional-State** | Expressions of frustration, confusion, excitement, etc. |
| 3 | **Pace-Related** | Requests to speed up, slow down, or adjust pacing |
| 4 | **Repeat/Clarification** | Requests to repeat or clarify previous explanations |

## Architecture

- **Backbone**: TinyBERT (4-layer, 312-dim) — compact BERT variant
- **Head**: Multi-kernel CNN (filter sizes 2, 3, 4) + BatchNorm + FC hidden layer
- **Parameters**: ~14.5M total
- **Inference**: <50ms on CPU

```
TinyBERT → CNN (multi-kernel) → BatchNorm → MaxPool → FC(768→128) → FC(128→5)
```

## Performance

| Metric | Score |
|--------|-------|
| **Accuracy** | 99.6% |
| **F1 Score** | 99.6% |
| **Precision** | 99.6% |
| **Recall** | 99.6% |
| **Test Loss** | 0.069 |

### Per-Class Performance

| Intent | Precision | Recall | F1 | Support |
|--------|-----------|--------|----|---------|
| On-Topic Question | 0.993 | 0.997 | 0.995 | 300 |
| Off-Topic Question | 0.997 | 0.993 | 0.995 | 300 |
| Emotional-State | 0.993 | 1.000 | 0.997 | 300 |
| Pace-Related | 0.997 | 0.993 | 0.995 | 300 |
| Repeat/Clarification | 1.000 | 0.997 | 0.998 | 300 |

## Training Details

- **Epochs**: 7 (early stopping with patience=5)
- **Batch Size**: 16
- **Optimizer**: AdamW with discriminative fine-tuning (BERT LR: 2e-5, Head LR: 1e-3)
- **Scheduler**: Warmup + Cosine decay
- **Label Smoothing**: 0.1
- **Training Duration**: ~212 seconds

## Usage

```python
from TinyBert import IntentClassifier

# Initialize
classifier = IntentClassifier(num_classes=5)
classifier.load_model("prod_tinybert.pt")

# Predict
texts = ["Can you explain that again?"]
contexts = ["topic:Python Loops"]
predictions, probabilities = classifier.predict(texts, contexts)

intent_names = ['On-Topic Question', 'Off-Topic Question', 'Emotional-State', 'Pace-Related', 'Repeat/clarification']
print(f"Predicted: {intent_names[predictions[0]]}")
print(f"Confidence: {probabilities[0][predictions[0]]:.4f}")
```

### Compound Sentence Splitting

The model includes a `CompoundSentenceSplitter` that can detect and split compound questions:

```python
from TinyBert import CompoundSentenceSplitter

splitter = CompoundSentenceSplitter()
questions = splitter.split_compound_question("What is a loop and how do I use it?")
# Returns: ["What is a loop?", "how do I use it?"]
```

## Files

| File | Description |
|------|-------------|
| `TinyBert.py` | Model architecture, IntentClassifier wrapper, CompoundSentenceSplitter |
| `train.py` | Full training pipeline with early stopping and metrics |
| `auto_trainer.py` | Automated retraining pipeline |
| `dataset_generator.py` | Synthetic data generation |
| `test_suite.py` | Comprehensive test suite |
| `prod_tinybert.pt` | Production model weights |
| `best_tinybert.pt` | Best checkpoint from latest training |
| `training_results.json` | Detailed training metrics and history |
| `data/` | Training, validation, and test datasets |

## Requirements

```
torch
transformers
pandas
numpy
scikit-learn
tqdm
```

## Citation

Part of the **AI-Powered Personalized Learning Platform** graduation project.