NDLI: Two-stage language models for information retrieval

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Predicting category accesses for a user in a structured information space

Improving realism of topic tracking evaluation

Generic summarization and keyphrase extraction using mutual reinforcement principle and sentence clustering

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Statistical cross-language information retrieval using n-best query translations

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Compression of inverted indexes For fast query evaluation

Inverted file search algorithms for collaborative filtering

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Liberal relevance criteria of TREC -: counting on negligible documents?

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Automatic classification in product catalogs

Indexing, searching, and retrieving of recorded live presentations with the AOF (authoring on the fly) search engine

Is natural language an inconvenience or an opportunity for IR?

Using sampled data and regression to merge search engine results

Two-stage language models for information retrieval

Detecting and Browsing Events in Unstructured text

Bayesian online classifiers for text classification and filtering

Cross-document summarization by concept classification

Text genre classification with genre-revealing and subject-revealing features

Cross-lingual relevance models

Probabilistic combination of text classifiers using reliability indicators: models and results

Set-based model: a new approach for information retrieval

Methods and metrics for cold-start recommendations

Improving stemming for Arabic information retrieval: light stemming and co-occurrence analysis

Predicting query performance

PageRank, HITS and a unified framework for link analysis

UTACLIR -: general query translation framework for several language pairs

The Importance of Prior Probabilities for Entry Page Search

A new family of online algorithms for category ranking

Resolving query translation ambiguity using a decaying co-occurrence model and syntactic dependence relations

Using part-of-speech patterns to reduce query ambiguity

Task orientation in question answering

HyREX: hyper-media retrieval engine for XML

Experiments in high-dimensional text categorization

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Adaptive information extraction for document annotation in amilcare

ICA and SOM in text document analysis

ExWrap: semi-automatic wrapper generation by example

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Hierarchical approach to term suggestion device

Amilcare: adaptive information extraction for document annotation

Translingual vocabulary mappings for multilingual information access

The impact of corpus size on question answering performance

GS textplorer -: adaptive framework for information retrieval

Effective collection metasearch in a hierarchical environment: global vs. localized retrieval performance

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The web retrieval task and its evaluation in the third NTCIR workshop

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Non-linear reading for a structured web indexation

Document normalization revisited

User-centered interface design for cross-language information retrieval

Implementation of relevance feedback for content-based music retrieval based on user prefences

Spatial information retrieval and geographical ontologies an overview of the SPIRIT project

A visualisation tool for topic tracking analysis and development

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Study of category score algorithms for k-NN classifier

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A logistic regression approach to distributed IR

Automatic metadata generation & evaluation

A critical examination of TDT's cost function

Converting on-line bilingual dictionaries from human-readable to machine-readable form

Modeling (in)variability of human judgments for text summarization

Content-based music indexing and organization

Relative and absolute term selection criteria: a comparative study for English and Japanese IR

Experiments on data fusion using headline information

Building thematic lexical resources by term categorization

Topic structure modeling

Language model for IR using collection information

Automatic evaluation of world wide web search services

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Biterm language models for document retrieval

Selecting indexing strings using adaptation

Error correction in a Chinese OCR test collection

User interface effects in past batch versus user experiments

K-tree/forest: efficient indexes for boolean queries

Example-based phrase translation in Chinese-English CLIR

Probabilistic multimedia retrieval

Chinese keyword extraction based on max-duplicated strings of the documents

A hierarchical approach: query large music database by acoustic input

Correlating multilingual documents via bipartite graph modeling

Two-stage language models for information retrieval

Content Provider	ACM Digital Library
Author	Zhai, ChengXiang Lafferty, John
Abstract	The optimal settings of retrieval parameters often depend on both the document collection and the query, and are usually found through empirical tuning. In this paper, we propose a family of two-stage language models for information retrieval that explicitly captures the different influences of the query and document collection on the optimal settings of retrieval parameters. As a special case, we present a two-stage smoothing method that allows us to estimate the smoothing parameters completely automatically. In the first stage, the document language model is smoothed using a Dirichlet prior with the collection language model as the reference model. In the second stage, the smoothed document language model is further interpolated with a query background language model. We propose a leave-one-out method for estimating the Dirichlet parameter of the first stage, and the use of document mixture models for estimating the interpolation parameter of the second stage. Evaluation on five different databases and four types of queries indicates that the two-stage smoothing method with the proposed parameter estimation methods consistently gives retrieval performance that is close to---or better than---the best results achieved using a single smoothing method and exhaustive parameter search on the test data.
Starting Page	49
Ending Page	56
Page Count	8
File Format	PDF
ISBN	1581135610
DOI	10.1145/564376.564387
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2002-08-11
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Interpolation Leave-one-out Two-stage language models Parameter estimation Risk minimization Mixture model Dirichlet prior Two-stage smoothing
Content Type	Text
Resource Type	Article

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