Parsing a document

Information retrieval techniques: Lecture 8. The main topics covered in this chapter include: parsing a document; complications: format/language; precision and recall; tokenization; numbers; tokenization: language issues; stop words;... Please refer to the content of document.

16p tieuvulinhhoa 22-09-2022 6 3   Download

In previous work, supertag disambiguation has been presented as a robust, partial parsing technique. In this paper we present two approaches: contextual models, which exploit a variety of features in order to improve supertag performance, and class-based models, which assign sets of supertags to words in order to substantially improve accuracy with only a slight increase in ambiguity.

8p bunthai_1 06-05-2013 37 2   Download

Dividing sentences in chunks of words is a useful preprocessing step for parsing, information extraction and information retrieval. (l~mshaw and Marcus, 1995) have introduced a "convenient" data representation for chunking by converting it to a tagging task. In this paper we will examine seven different data representations for the problem of recognizing noun phrase chunks. We will show that the the data representation choice has a minor influence on chunking performance.

7p bunthai_1 06-05-2013 41 3   Download

We propose a parser for constraintlogic grammars implementing HPSG that combines the advantages of dynamic bottom-up and advanced topdown control. The parser allows the user to apply magic compilation to specific constraints in a grammar which as a result can be processed dynamically in a bottom-up and goal-directed fashion. State of the art top-down processing techniques are used to deal with the remaining constraints. We discuss various aspects concerning the implementation of the parser as part of a grammar development system. ...

8p bunthai_1 06-05-2013 45 2   Download

We describe several tabular algorithms for Tree Adjoining G r a m m a r parsing, creating a continuum from simple pure bottom-up algorithms to complex predictive algorithms and showing what transformations must be applied to each one in order to obtain the next one in the continuum.

8p bunthai_1 06-05-2013 46 4   Download

This paper presents a new approach to partial parsing of context-free structures. The approach is based on Markov Models. Each layer of the resulting structure is represented by its own Markov Model, and output of a lower layer is passed as input to the next higher layer. An empirical evaluation of the method yields very good results for NP/PP chunking of German newspaper texts.

8p bunthai_1 06-05-2013 53 4   Download

This paper proposes an approach to full parsing suitable for Information Extraction from texts. Sequences of cascades of rules deterministically analyze the text, building unambiguous structures. Initially basic chunks are analyzed; then argumental relations are recognized; finally modifier attachment is performed and the global parse tree is built. The approach was proven to work for three languages and different domains. It was implemented in the IE module of FACILE, a EU project for multilingual text classification and !E. ...

8p bunthai_1 06-05-2013 54 3   Download

The notion of mild context-sensitivity was formulated in an attempt to express the formal power which is both necessary and sufficient to define the syntax of natural languages. However, some linguistic phenomena such as Chinese numbers and German word scrambling lie beyond the realm of mildly contextsensitive formalisms. On the other hand, the class of range concatenation grammars provides added power w.r.t, mildly context-sensitive grammars while keeping a polynomial parse time behavior.

8p bunthai_1 06-05-2013 46 2   Download

Name tagging is a critical early stage in many natural language processing pipelines. In this paper we analyze the types of errors produced by a tagger, distinguishing name classification and various types of name identification errors. We present a joint inference model to improve Chinese name tagging by incorporating feedback from subsequent stages in an information extraction pipeline: name structure parsing, cross-document coreference, semantic relation extraction and event extraction.

8p hongvang_1 16-04-2013 45 2   Download

We present a fast query-based multi-document summarizer called FastSum based solely on word-frequency features of clusters, documents and topics. Summary sentences are ranked by a regression SVM. The summarizer does not use any expensive NLP techniques such as parsing, tagging of names or even part of speech information.

4p hongphan_1 15-04-2013 39 2   Download

In this paper we present a joint content selection and compression model for single-document summarization. The model operates over a phrase-based representation of the source document which we obtain by merging information from PCFG parse trees and dependency graphs. Using an integer linear programming formulation, the model learns to select and combine phrases subject to length, coverage and grammar constraints.

10p hongdo_1 12-04-2013 63 1   Download

Most implementations of critical Internet protocols are written in type-unsafe languages such as C or C++ and are regularly vulnerable to serious security and reliability problems. Type-safe languages eliminate many errors but are not used to due to the perceived performance overheads. We combine two techniques to eliminate this performance penalty in a practical fashion: strong static typing and generative metaprogramming. Static typing eliminates run-time type information by checking safety at compile-time and minimises dynamic checks.

14p doiroimavanchuadc 06-02-2013 48 4   Download

Microcontroller applications with the Basic Stamp, PIC, 8051 and various others can often be enhanced with the use of the PC serial port, and a software interface. Designing your own custom interface software for your next microcontroller application isn't as hard as you may think.

37p tailieuvip13 24-07-2012 44 5   Download

Method of representing data  Differs from HTML by storing and representing data instead of displaying or formatting data  Tags similar to HTML tags, only they are user-defined  Follows a small set of basic rules  Stored as a simple ASCII text file, so portability is insanely easy.

21p thiuyen12 15-09-2011 35 1   Download

Stop parsing if "Received" field a vaild local address Cho phép trong quá trình xử lý nhận được một địa chỉ mà Serrver quản lý thì nó sẽ dừng xử lý. Parse "Subject:" header for address inside "(" and ")" charaters Lựa chọn cho phép MDaemon sẽ tìm địa chỉ chứa trong dấu "(...)" trong phần "Subject" và địa chỉ này được sử dụng cùng với các địa chỉ gửi đi khác để chuyển thư. Parse these headers for email address Hộp danh sách các phần của header mà MDeamon sẽ kiểm tra để lấy địa chỉ Remove Bấm nút...

5p phuoctam50 12-08-2011 54 3   Download

PHP5 cung cấp class SimpleXML là một class rất dễ sử dụng, bài này sẽ hướng dẫn các  bạn parse file XML trong 7 nốt nhạc.  Đầu tiên, lấy một đoạn XML mẫu để tập tành phân tích:  PHP Code: (Click Here to Select All)        A Thousand Splendid Suns  Khaled Hosseini  Riverhead Hardcover  14.27      The Brief Wondrous Life of Oscar Wao  Junot Diaz  Riverhead Hardcover  14.97      Harry Potter and the Deathly Hallows  J. K. Rowling  Arthur A. Levine Books  19.24   ...

4p vanthoiaptech 25-01-2011 112 8   Download

232 Chapter 9 Security Model Listing 9.15 Application Code to Call a Secured Service def callDataService( args ) { logger.INFO {"Starting with: ${args}"} def URL = "https://crownjewels.acme.com/resources/${args.service}" if ( args.id ) { URL += "/${args.id} } args.remove('service') args.remove('id') args.eachWithIndex() { it, idx - URL += (idx == 0 ? '?' : '&' ) + URLEncoder.encode(it.key, "UTF-8") + "=" + URLEncoder.encode(it.value, "UTF-8") } logger.INFO {"URL: ${URL}"} def response = Connection.doGET(URL) def doc = new XmlParser().parse( response.responseBody ) logger.

10p yukogaru14 30-11-2010 52 2   Download

An XML-Based Navigation System 26 27 28 29 30 31 32 33 _xml = new XML(_menuLdr.data); initLoader(); initMenus(); } catch (err:TypeError) { trace("Can't parse loaded content as XML:", err.message); } } N OT E The initLoader() method creates an instance of the SafeLoader class (line 36), positions it below the future location of the menus (line 37), and adds it to the display list (line 38).

10p yukogaru13 30-11-2010 74 12   Download

A query expresses in a high-level language like SQL must first be scanned, parsed, and validated. • Once the above steps are completed, an internal representation of the query is created. Typically this is either a tree or graph structure, called a query tree or query graph. • Using the query tree or query graph the RDBMS must devise an execution strategy for retrieving the results from the internal files. • For all but the most simple queries, several different execution strategies are possible. The process of choosing a suitable execution strategy is called query optimization....

33p vutoanptit 18-08-2010 114 19   Download

128 Chapter 5 Implementing with PHP: Standalone Scripts if($i++ == 10) { break; } } print “\n\n”; } ? The script works by reading in a logfile on STDIN and matching each line against $regex to extract individual fields.The script then computes summary statistics, counting the number of requests per unique IP address and per unique Web server user agent. Because combined-format logfiles are large, you can output a . to stderr every 1,000 lines to reflect the parsing progress. If the output of the script is redirected to a file, the end report will appear in the file, but the .’s will...

50p xmen 02-08-2010 81 10   Download