Online Course Support | Text Retrieval and Search Engines

Let qq be the original query vector, D_R=\{P_1,…,P_n \}DR={P1,…,Pn} be the set of positive document vectors, and D_N=\{N_1,…,N_m\}DN={N1,…,Nm} be the set of negative document vectors. Let q_1q1 be the expanded query vector after applying Rocchio on D_RDR and D_NDN with positive parameter values \alphaα, \betaβ, and \gammaγ. Let q_2q2 be the expanded query vector after applying Rocchio on D_RDR and D_NDN with the same values for \alphaα, \betaβ, but \gammaγ being set to zero. Which of the following is correct?

ByAdmin August 15, 2021August 15, 2021

Question 9

Let $q$ be the original query vector, $D_R=\{P_1,…,P_n \}$ be the set of positive document vectors, and $D_N=\{N_1,…,N_m\}$ be the set of negative document vectors. Let $q_1$ be the expanded query vector after applying Rocchio on $D_R$ and $D_N$ with positive parameter values $\alpha$ , $\beta$ , and $\gamma$ . Let $q_2$ be the expanded query vector after applying Rocchio on $D_R$ and $D_N$ with the same values for $\alpha$ , $\beta$ , but $\gamma$ being set to zero. Which of the following is correct?

1 point

q_2

can have greater or equal weights to

q_1

for each dimension.

q_2

has strictly greater weights than

q_1

for each dimension.

q_1

can have greater or equal weights to

q_2

for each dimension.

q_1

has strictly greater weights than

q_2

for each dimension.

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