The similarity measure is a normalized scalar-product. How the normalization is computed?

Question

The similarity measure is a normalized scalar-product. How the  normalization  is computed?

Answer

∑ i n t f i × i d f i {"version":"1.1","math":"\sum_i^n{tf_i	imes idf_i}"}

Answer

∑ i n ( t f i × i d f i ) 2 {"version":"1.1","math":"\sqrt{\sum_i^n{(tf_i	imes idf_i)^2}}"}

Answer

∑ i n ( t f i × i d f i ) 2 {"version":"1.1","math":"\sum_i^n{(tf_i	imes idf_i)^2}"}

Answer

∑ i n t f i × i d f i {"version":"1.1","math":"\sqrt{\sum_i^n{tf_i	imes idf_i}}"}

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