What is the difference between following terms: "Data Reduction",

"Dimension Reduction", "Feature Selection", "Feature Extraction" and

"Sampling"?a$)$ What is the difference between following terms: "Data Reduction",

"Dimension Reduction", "Feature Selection", "Feature Extraction" and

"Sampling"?

b$)$ Explain the role of feature dimensionality in the problem of model

overfitting?

What are the first ten $3-$shingles in the following sentence in the two cases:

i$.$ consider the case of using characters as tokens, and

ii$.$ consider the case of using words as tokens.

The most effective way to represent documents as sets, for the purpose

of identifying lexically similar documents is to construct from the

document the set of short strings that appear within it$.$