need to extended the topic you can use same answers and references but need more words

I’m trying to study for my Engineering course and I need some help to understand this question.

please write more discussion for each question

1. What are the two major challenges in the problem of text analysis?
2. What is a reverse index?
3. Why is the corpus metrics dynamic. Provide an example and a scenario that explains the dynamism of the corpus metrics.
4. How does tf idf enhance the relevance of a search result?
5. List and discuss a few methods that are deployed in text analysis to reduce the dimensions.


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