Báo cáo khoa học: "Optimizing Language Model Information Retrieval System with Expectation Maximization Algorithm" doc
Báo cáo khoa học: "Optimizing Language Model Information Retrieval System with Expectation Maximization Algorithm" doc
... and AFNLP
Optimizing Language Model Information Retrieval System with
Expectation Maximization Algorithm
Justin Liang-Te Chiu
Department of Computer Science
and Information Engineering, ... each document.
3.1 The basic language modeling method
for document reduction
65
Suppose we have a huge document set D, and a
query Q, we firstly reduce the document set to...
Tài liệu Báo cáo khoa học: "A study of Information Retrieval weighting schemes for sentiment analysis" doc
... therefore
df
i,j
= 0 .
3.3 SMART and BM25 tf.idf variants
The SMART retrieval system by Salton (1971) is
a retrieval system based on the vector space model
(Salton and McGill, 1986). Salton and Buckley
(1987) ... provides information about the gen-
eral distribution of term i amongst documents of
all classes, without providing any additional evi-
dence of class preference. The uti...
Tài liệu Báo cáo khoa học: "Optimizing Typed Feature Structure Grammar Parsing through Non-Statistical Indexing" doc
... identify nodes in a mother
that carry no relevant information with respect to
unification with a particular daughter. For a mother
M unifiable with a daughter D, these nodes will
be grouped in ... descriptions. In our
definitions, we assume without loss of generality
that parsing proceeds bottom-up, with left-to-right
of rule daughters. This is the ALE system s (Car-
penter and Penn,...
Tài liệu Báo cáo khoa học: "Natural Language for Expert Systems: Comparisons with Database Systems" ppt
... Natural Language for Expert Systems:
Comparisons with Database Systems
Kathleen R. McKeown
Department of Computer Science
Columbia University
New York, N.Y. 10027
1
Introduction
Do natural language ... naturally
studied in some other system than in the database
system.
We are currently working on natural language
for expert systems at Columbia and thus, expert
systems p...
Báo cáo khoa học: "The Role of Information Retrieval in Answering Complex Questions" ppt
... Agency.
3 Document Retrieval
Since information retrieval systems supply the ini-
tial set of documents on which a question answer-
ing system operates, it makes sense to optimize
document retrieval ... 100
Lucene documents as training samples. After ex-
perimenting with different features, we discov-
ered that a regression model with the following
performed best: passage match...
Tài liệu Báo cáo khoa học: A selenium-containing single-chain abzyme with potent antioxidant activity docx
... defense
system. The enzymatic antioxidant system is mainly
composed of glutathione peroxidase (GPX), catalase,
superoxide dismutase and thioredoxin peroxidase. The non-
enzymatic antioxidant system ... reaction system, in which the cytochrome c
concentration was 15 l
M
. The absorbance was decreased
Ó FEBS 2003 Se-containing abzyme with potent antioxidant activity (Eur. J. Biochem. 27...
Tài liệu Báo cáo khoa học: "Matching Readers’ Preferences and Reading Skills with Appropriate Web Texts" docx
... asso-
ciated with his educational background. To our
knowledge, Read-X is the first web-based system
that performs real-time searches and returns results
classified thematically and by reading level within
seconds. ... infor-
mation retrieval system (Collins-Thompson and
Callan, 2004) is based on web data that have been
annotated and indexed off-line. Also, relatedly,
(Schwarm and Osten...
Báo cáo khoa học: "Creative Language Retrieval: A Robust Hybrid of Information Retrieval and Linguistic Creativity" pot
... 19-24, 2011.
c
2011 Association for Computational Linguistics
Creative Language Retrieval:
A Robust Hybrid of Information Retrieval and Linguistic Creativity
Tony Veale
School of Computer Science ... Ireland.
Tony.Veale@UCD.ie
Abstract
Information retrieval (IR) and figurative
language processing (FLP) could scarcely
be more different in their treatment of lan-
guage and meanin...
Báo cáo khoa học: "Enhancing Language Models in Statistical Machine Translation with Backward N-grams and Mutual Information Triggers" ppt
... the
standard forward n-gram language model.
If we simultaneously integrate both the backward
language model P
bL
and the MI trigger model M I
into the system, the new log-linear model will be
formulated ... baseline with the backward language
model. F+B: forward+backward language model .
is better enough to be selected as the best hypothe-
sis by the decoder. This sugges...
Tài liệu Báo cáo khoa học: "A Statistical Model for Unsupervised and Semi-supervised Transliteration Mining" pptx
... (1)
Transliteration systems are trained on a list of
transliteration pairs. The alignment between the
transliteration pairs is learned with Expectation
Maximization (EM). We use a simple unigram
model, so ... transliteration model p
1
(e, f ) handles only the
transliteration pairs. We propose a second model
p
2
(e, f ) to deal with non-transliteration pairs (the
“non-transliterat...