8. The method of claim 7 further comprising the step of calculating the normalized length of the query set according to the formula: len ⁡ ( q ) = ∑ q i ∈ q ⁢ idf ⁡ ( q i ) 2 wherein: q represents the query set; len(q) represents the normalized length of the query set; and, q i represents a specific token in q.
8. The method of claim 7 further comprising the step of calculating the normalized length of the query set according to the formula: len ⁡ ( q ) = ∑ q i ∈ q ⁢ idf ⁡ ( q i ) 2 wherein: q represents the query set; len(q) represents the normalized length of the query set; and, q i represents a specific token in q. 9. The method of claim 8 further comprising the step of calculating the similarity score of s and q according to the formula: ℐ ⁡ ( q , s ) = ∑ s i ∈ q ⋂ s ⁢ idf ⁡ ( s i ) 2 len ⁡ ( s ) ⁢ len ⁡ ( q ) wherein (q, s) is the similarity score of s and q.