Question

What is a top-down parser?

(a) Begins by hypothesizing a sentence (the symbol S) and successively predicting lower level constituents until individual preterminal symbols are written

(b) Begins by hypothesizing a sentence (the symbol S) and successively predicting upper level constituents until individual preterminal symbols are written

(c) Begins by hypothesizing lower level constituents and successively predicting a sentence (the symbol S)

(d) Begins by hypothesizing upper level constituents and successively predicting a sentence (the symbol S)

I got this question by my school teacher while I was bunking the class.

Asked question is from Machine Learning topic in section Introduction to Artificial Intelligence of Artificial Intelligence

Answer 1

The correct answer is (a) Begins by hypothesizing a sentence (the symbol S) and successively predicting lower level constituents until individual preterminal symbols are written

Easy explanation: A top-down parser begins by hypothesizing a sentence (the symbol S) and successively predicting lower level constituents until individual preterminal symbols are written.