# Optional extensions — after the TEE questions

Subject: Natural Language Processing

Exam: TEE

Reader: https://deep-learning-study-room.vercel.app/nlp/#tee/about/optional-extensions

Canonical: https://deep-learning-study-room.vercel.app/read/nlp/tee/about-chapter/optional-extensions/

Additional explanation; no corresponding question in the two supplied TEE papers. No exam marks are implied.

1. [Add-k: preserve a normalized vocabulary row](https://deep-learning-study-room.vercel.app/read/nlp/tee/about/optional-extensions--add-k/)
2. [Forward HMM: sum paths and normalize posteriors](https://deep-learning-study-room.vercel.app/read/nlp/tee/about/optional-extensions--forward-probability/)