48bilingual training examples
23/24correct held-out routes
0.977held-out macro F1
Try the English tutor
Ask in English or Portuguese. Use the controls to set the topic, difficulty and lesson length.
Choose an example or enter a request to begin.
Four teaching workflows
- Lesson planning: timed objectives, a model, guided practice, independent production and a success check.
- Conversation practice: scenario-based turns, repetition, sentence starters and bundled audio playback.
- Corrective feedback: targeted examples for third-person agreement and past tense, with a retry.
- Retrieval practice: an answerable drill, delayed feedback and a follow-up task.
Training and evaluation
Train a multinomial Naive Bayes classifier on labeled EN/PT-BR requests and export its weights for browser inference. A small score margin routes uncertain requests to a clarification. The tutor prompt pack and eight instruction-response examples specify teaching behavior and acceptance cases for a future generative system.
| Expected intent | Lesson | Roleplay | Feedback | Practice | Clarify |
|---|---|---|---|---|---|
| Lesson | 6 | 0 | 0 | 0 | 0 |
| Roleplay | 0 | 6 | 0 | 0 | 0 |
| Feedback | 0 | 0 | 6 | 0 | 0 |
| Practice | 0 | 0 | 0 | 5 | 1 |
The one missed request was a vocabulary drill that triggered clarification. The small, authored holdout measures intent routing only. Broader evaluation would use separately authored requests, multi-intent inputs and review of lesson quality by teachers.