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| "text": "EQUATION", |
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| "start": 0, |
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| "text": "EQUATION", |
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| "raw_str": "\uf96a \uf901 \uf96a \uf941 \uf9dd \uf92d \uf941 \uf9ba \uf9a3 \uf96a \uf9dd \uf901 \uf961 \uf961 \uf984 \uf984 \uf906 \uf967 \uf984 \uf96a \uf9ba \uf984 \uf96a \uf941 \uf9be \uf96a \uf984 \uf941 \uf92d 2. 2.1 \uf9be \uf941 \uf9be \ufa08 CIRB030 \uf96a (NTCIR-3 \uf9be ) \uf9ba 381375 \uf9ba 42 1 \uf9b5 \uf941 <DESC> \uf906 \uf9ba \ufa01 \uf967 \uf96a \uf978 Rigid Relevance \uf967 Relax Relevance \uf941 \uf9b5 \uf941 (TREC_EVAL) [1]\uf92d \uf96a \uf961(MAP) N \uf961 (Precision: At N docs) \u2024 \uf961(MAP) \uf96a \uf961(AP) =1 1 = ( ) r i i AP r Doc i \u2211 1 1 Q j j MAP AP Q = = \u2211 r \uf96a \uf96a \uf969 ( ) Doc i \uf96a \uf92d i Q \uf969 j AP j \uf961 MAP \uf961 \u2024Precision: At N docs \uf96a N \uf961 N \uf961 1 1 @ Q j j P N p Q = = \u00d7 \u2211 j p j N \uf961 2.2 \uf96a \uf96a \uf941 \uf96a \uf96a \uf96a \uf906 \uf9e4 \ufa08 \uf9cd \uf9d0 , i j tf j df \uf96a \uf9be \uf96a \uf906 q { } j t \uf96a \uf9be BM11 \ufa08 \ufa01 \uf906 \uf906 q \uf96a DR D \uf96a { } j t , i j tf j df } \uf96a \uf9be q\u2032 INI D (Rocchio Method) LE D D \ufa08 ( DR D ) \uf906 \uf906 q\u2032 \ufa08 \uf96a LE D \uf941 \uf96a Robertson and Walker OKAPI BM11 \uf96a , 1 11( , ) T i j ij j j BM d q c tf idf = \u2032 \u2032 = \u00d7 \u00d7 \u2211 , , , i j i j i i j tf tf dl tf dl \u2032 + 0.5 log( ) 0.5 j j j n df idf df \u2212 + \u2032 + j c j \uf906 \uf969 n \uf969 i dl i d \ufa01 dl \ufa01 , i j tf \u2032 j idf \u2032 \uf941 Rocchio Blind Feedback [3][4] , , 1 1 1 1 R S j i j i j i i w tf tf R S \u03b2 = = \u2032 \u2032 = \u00d7 \u2212 \u00d7 \u00d7 \u2211 \u2211 R R S S n R n \uf969 \u03b2 \uf96b\uf969 j R \uf961 \uf961 j w \uf96a R \uf98a j w \uf98a \ufa01\uf97e \uf92d \uf98a Na Nb Nc Nd FW \uf967 VA \uf9d0 VB VC VCL \uf906 VE \uf9fa \uf967 VH \uf9fa VHC \uf9fa \uf9d0 VI \uf9fa VJ \uf9cd \uf9d0 3. \uf941 \uf9ba \uf9a3 3.1 \uf9a3 \uf9a3 \uf967 \uf9f7 \uf906 \uf9a3 \uf9b5 \uf9ea \uf974 \uf906 \uf9a3 \uf9a3 \uf90f \uf90a \uf9a3 \uf9a3 \uf997\ufa01 \uf92d \uf9f7 \uf997 \uf9dd \uf997 \uf92d \ufa08 N \uf9f7 \uf97e j t uv N \uf969 , i j tf j i , max( ) i j i tf j N \uf969 m N \uf969 i d i \uf962 \uf969 \uf969 \uf9f7 \uf9a3 \uf97e j c j j t q q q t \u2208 = \u22c5 \u2211 uuv u v q \uf906 j t v \uf97e j q j t \uf9a3 \uf97e \uf97e \uf997\ufa01 ( , ) j T c j c j j t q q t r q t q \u2208 \u22c5 = \u2211 uuv uv uu v uv j t v \uf97e j q j t c q v \uf9a3 \uf97e \uf9a3 \uf997\ufa01 \uf9f7 \uf997 C \uf997 \uf93f \uf997 \uf9a3 \uf997\ufa01 ( , ) c j r q t uu v uv \uf9ba \uf997 \uf965 \uf969 ( ) (1 ) ( , ) j i i i c j t C d s s r q t \u03b1 \u03b1 \u2208 \u2229 \u2032 = \u00d7 + \u2212 \u00d7 \u2211 uu v uv i s i d \uf96a \uf969 i s \u2032 \uf901 i d \uf969 C \uf997 i C d \u2229 \uf997 C i d \u03b1 \uf969 i s \uf969 i s \u2032 \uf961 0 1 \u03b1 \u2264 \u2264 3.2 \uf9a3 \uf9dd \uf906 \uf997\ufa01\uf92d \uf969 \uf9b5 \uf9ba \uf96a \uf969 \uf92d \uf906 \uf96a \uf969 \uf9d0 \uf9b5 \uf9dd \uf906 \uf997\ufa01 \uf997\ufa01 \uf969 \uf97e \ufa01 \uf9be \uf9be \uf906 \uf997\ufa01 \uf97e \uf92d \uf969 \uf9f7 \uf906 \uf97e q v \uf97e \uf9dd \uf97e k c uu v \uf97e \uf97e \uf97e \uf97e \uf97e \uf9ea \uf9ea \uf97e \uf9be \uf967 \uf96a \uf969 \uf906 k \uf997\ufa01 cos( , ) k k k q c q c q c \u22c5 = \u00d7 v uu v v uu v v uu v k c uu v k \uf97e \uf967 \uf906 \uf997\ufa01 \uf997\ufa01 \uf969 \uf969 \uf997\ufa01\uf978 (1 ) cos( , ) i i k s s q c \u03b1 \u03b1 \u2032 = \u00d7 + \u2212 \u00d7 v uuv i s \u2032 i s \u03b1 i k 3.3 \uf96a \uf906 \uf997 \uf92d \uf997 \uf974 \uf9a3 \uf997\ufa01 \uf9a3 \uf92d \uf9b5 \uf902 \uf96a \uf961 \ufa09 \uf9ba \uf967 \uf9e4 \uf9dd \uf906q BM11(A,q)>0 BM11(B,q)=0 \uf92d \uf969 \uf906 \uf978 \uf9b5 \uf906 \uf978 \uf978 (\uf9b5 ) \uf978 \uf9ea \uf92d \uf9b5 \uf969 \uf978 \uf9ea \uf906 , j k t t \uf969 , i j k L , j k df \uf969 , i j k L \uf974 , j k t t \uf969 , j k df , j k t t \uf969 , , ( , ) (1 ) ( ) j k i i i jk jk t t q s s L i d f \u03b1 \u03b1 \u2208 \u2032 = \u00d7 + \u2212 \u00d7 \u00d7 \u2211 , , log j k j k n idf df = , j k t t \uf906 n \uf969 i s \u2032 i s \u03b1 3.4 \uf941 \uf9ba\uf967 \uf9a3 \uf9a3 \uf9a3 \uf997 \uf997\ufa01 \uf9dd \uf997\ufa01 \uf92d \uf9dd \uf901 \uf978 \uf9a3 \uf967 \uf962 \uf967 \uf9e4\uf9a3 \uf967 ,1 i R ,2 i R i d \uf978 \uf969 \u03b2 \uf96b\uf969 3.5 \uf96a \ufa08 \uf906 \uf96a \uf969 \uf96b \uf9a3 \uf9a3 \uf9ba \uf961 \uf961 \uf9a3 \uf978 \uf92d \uf961 \uf92d \uf967 \uf961\uf92d\uf96f \uf96a \uf961 \uf961 \uf92d \uf901 \uf96a \uf961 \uf96a \uf978 \uf92d \uf9ba 4. \uf984 4.1 \uf984 \uf98a \uf97e \uf9ba \uf967 \uf984 \uf984 \uf92d \uf967 \uf96a \uf9ba \uf906 \ufa01 \uf984 \ufa01 \ufa09 \uf96a j e k q \uf969 , ,", |
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| "TABREF0": { |
| "text": "Email: M9409112@mail.ntust.edu.tw, bslin@cs.ntust.edu.tw", |
| "type_str": "table", |
| "content": "<table><tr><td>\uf96a \uf9a3</td><td/><td>\uf967</td><td/><td colspan=\"2\">\uf96a \uf967</td></tr><tr><td>\uf9a3</td><td/><td>\uf967</td><td/><td/><td>\uf96a \uf92d</td><td>\uf962</td></tr><tr><td colspan=\"2\">(Word Mismatch)</td><td/><td/><td/></tr><tr><td/><td colspan=\"2\">(Query Expansion)</td><td/><td/><td>\uf9a3</td></tr><tr><td/><td/><td colspan=\"3\">(Expanded Words)</td><td>\uf906</td></tr><tr><td>\uf906</td><td>\uf9a3</td><td/><td>\uf96a</td><td/><td>\uf96a \uf92d</td><td>\uf961</td></tr><tr><td>\uf901</td><td/><td>\uf941</td><td/><td/><td>(Local</td></tr><tr><td colspan=\"3\">Expansion)[7 10 11 13 14 18]</td><td colspan=\"2\">\uf9a3</td><td>\uf906</td></tr><tr><td>\uf96a</td><td/><td/><td>\ufa08</td><td/></tr><tr><td/><td>\uf906</td><td colspan=\"2\">\ufa08 \uf96a</td><td/><td>\uf9ba</td><td>\uf9a3</td><td>\ufa01</td></tr><tr><td/><td>\uf96a</td><td>\uf9f7</td><td/><td/><td>\uf9e4</td></tr><tr><td/><td/><td/><td/><td/><td>\uf96a</td><td>\uf967</td></tr><tr><td/><td/><td>\uf961</td><td/><td/></tr><tr><td/><td/><td>\uf967</td><td/><td/><td>(Query Drift)</td><td>\uf9ba</td></tr><tr><td/><td/><td/><td/><td colspan=\"2\">(Document Re-ranking)</td><td>[7 9</td></tr><tr><td colspan=\"3\">12 15 16 17 18 19 20]</td><td/><td/></tr><tr><td/><td>\uf96a\uf9b4</td><td/><td/><td/><td>\uf96a</td></tr><tr><td/><td/><td/><td/><td/><td>\uf96a</td></tr><tr><td/><td/><td/><td/><td/><td>\uf96a</td></tr><tr><td/><td/><td/><td/><td/><td>\uf906\uf967</td></tr><tr><td/><td/><td>\uf906\uf967</td><td colspan=\"2\">\uf974</td><td>\uf906</td><td>\uf96a</td></tr><tr><td/><td/><td/><td>\ufa09</td><td>\uf96a</td></tr><tr><td/><td>\uf941</td><td/><td/><td/></tr><tr><td/><td/><td/><td/><td/><td>\uf96a</td></tr><tr><td/><td>\uf97e</td><td/><td/><td/><td>\uf941</td><td>\uf9ba</td></tr><tr><td/><td/><td/><td/><td>\uf96a</td><td>\uf901</td></tr><tr><td/><td/><td/><td/><td/><td>\uf901</td></tr><tr><td colspan=\"2\">\uf96a</td><td>\uf96a</td><td>\uf961</td><td/></tr><tr><td/><td>\uf961</td><td/><td/><td/></tr><tr><td/><td>\uf96a</td><td/><td/><td/></tr><tr><td>1. \uf941</td><td/><td/><td/><td/></tr><tr><td/><td>\uf97e</td><td/><td colspan=\"2\">\uf97e</td><td>\uf9be</td></tr><tr><td>\uf9be</td><td>\uf96a\uf9b4</td><td/><td/><td/><td>\uf96a</td></tr><tr><td/><td/><td>\uf96a</td><td/><td/><td>\uf96a</td></tr></table>", |
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