What differences would you expect for word embeddings that use a short context window vs. a large context window? - word2vec & GloVe Review Assignment - Use this assignment in your class!

word2vec & GloVe Review Assignment

1.What differences would you expect for word embeddings that use a short context window vs. a large context window?

2.What are some problems with count-based methods for representing words?

3.Explain the intuition behind word2vec.

4.Consider the task of learning skip-gram embeddings. Provide 4 positive and 8 negative examples for the target word 'shovel' in the following excerpt: "... I purchased a shovel to rake the leaves in my lawn ..."

5.Consider the weighted unigram frequency formula for negative sampling in word2vec: \(P_\alpha(w) = {{count(w)^\alpha}\over{\sum_{w'} count(w')^\alpha}}\). Why is \(\alpha={3\over4}\) preferred over \(\alpha=1\)?

6.word2vec uses the logistic or sigmoid function to predict if a context word \(c\) is a real context word for a target word \(t\). How can we compute \(P(+| t,c)\)?

7.Compare and contrast CBOW and skip-gram. What are the advantages of each?

8.What's the intuition behind GloVe?

9.How does GloVe handle words that never co-occur together in a training corpus?

10.What are the advantages and disadvantages of GloVe compared to word2vec?

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Instructor solution

Alec KretchMAY 15, 2020 AT 11:11 PM

Vector Semantics Slide Deck (2) (page 29)

Jurafsky, D., Martin, J.H. (2019). Vector Semantics, Part II [PowerPoint slides]. Retrieved from https://web.stanford.edu/~jurafsky/slp3/ (May 3, 2021)

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