This page continues our study of Language Models. It consists of:
- three videos of short lectures. They cover:
- Evaluation I (specifically, which metrics don't work)
- Evaluation II (specifically, metrics that do work)
- Smoothing
- some required reading from Jurafsky and Martin
- a quiz that tests your understanding of the material presented here.
Please do the required reading, and attempt the quiz. If there is anything you don't understand, then please ask questions in the lecture or on piazza.
Lecture 6 slides: Whole!
6a: Evaluation I
- Slides: 06a_slides.pdf
6b: Evaluation II
- Slides: 06b_slides.pdf
6c: Smoothing
- Slides: 06c_slides.pdf
Recommended Reading
J&M 3.2, 3.5--3.9 (2nd edition: 4.intro-4.5). Note that Good Turing is explained only in the 2nd edition reading, and so for this lecture the 3rd edition required reading doesn't replace the 2nd edition required reading.
NOTE: The abbreviation J&M refers to the textbook:
Dan Jurafsky and James H. Martin, Speech and Language Processing.
When we specify 2nd edition, we are referring to the version of the book that was published by Pearson International in 2008.
When we specify 3rd edition, then we will supply links to the drafts of the relevant parts of that book (since the third editiion isn't published yet, but the current draft is available here).
Quiz 6: Evaluation and Smoothing
These questions are designed to test your understanding of the above course content; doing this quiz does not contribute to your overall grade. Some questions require a text answer. You can ask for formative feedback on these from your tutor or on piazza. Other questions are multiple choice or they require a numeric answer: you will get immediate feedback for these. Please don't attempt this quiz until you have acquainted yourself with this lecture and the required reading.
You must be logged onto Learn to do this quiz.