a unified statistical model

... important subtask for many natural language processing applications, such as partial parsing, information retrieval and machine translation. A baseNP is a simple noun phrase that does not contain other ... pp.218-224. COLING-ACL’98 Lance A. Ramshaw and Michael P. Marcus ( In Press). Text chunking using transformation-based learning. In Natural Language Processing Using Very large Corpora. Kluwer. Originally appeared in ... other approaches where the two steps are separated, we integrate them into a unified statistical framework. Our model also integrates lexical information. Finally, Viterbi algorithm is applied...

Ngày tải lên: 08/03/2014, 05:20

... represented by a bag-of-word. Among the words, there is a topic term Avatar (t 1 ) occurring twice, i.e. Avatar in A and Avatar in C, and two senti- ment words comfortable (o 1 ) and favorite (o 2 ) ... 4.1.1 Benchmark Datasets Our experiments are based on the Chinese benchmark dataset, COAE08 (Zhao et al., 2008). COAE dataset is the benchmark data set for the opinion retrieval track in the ... document. A weighted dictionary was generated from previous TREC relevance data (Amati et al., 2007). This dictionary was submit- ted as a query to a search engine to get an initial query-independent...

Ngày tải lên: 20/02/2014, 04:20

... be divided into statistical algorithms and rule-based algorithms. Statistical algorithms generally use character n- gram (Eojeol 1 or Eumjeol 2 n-gram in Korean) (Kang and Woo, 2001; Kwon, ... it needs a word dictionary and takes long time for searching many character combinations. 61 4.2 Experiment Results and Analyses We used two separate Eumjeol n-grams as lan- guage models for ... single Jaso tran- 3 Jaso is a Korean character. 4 ‘Transition’ means the correct character is changed to other character due to some causes, such as typographical errors. sition case (나와욧Æ나와요...

Ngày tải lên: 20/02/2014, 12:20

... system learns this as a non-transliteration but it is wrongly annotated as a transliteration in the gold standard. Arabic nouns have an article “al” attached to them which is translated in English as ... uses Hidden Markov Models (Nabende, 2010; Darwish, 2010; Jiampojamarn et al., 2010), Finite State Au- tomata (Noeman and Madkour, 2010) and Bayesian learning (Kahki et al., 2011) to learn transliteration pairs ... International Language Resources and Evaluation (LREC’10), Val- letta, Malta. Sittichai Jiampojamarn, Kenneth Dwyer, Shane Bergsma, Aditya Bhargava, Qing Dou, Mi-Young Kim, and Grzegorz Kondrak....

Ngày tải lên: 19/02/2014, 19:20

... a consensus translation technique to bootstrap parallel data using off-the-shelf translation sys- tems for training a hierarchical statistical transla- tion model for general domain instant ... SMS normalization. 2.3 SMS Normalization versus Text Para- phrasing Problem Others may regard SMS normalization as a para- phrasing problem. Broadly speaking, paraphrases capture core aspects ... minimal adaptation. One advantage of this pre-translation normalization is that the di- versity in different user groups and domains can be modeled separately without accessing and adapting...

Ngày tải lên: 20/02/2014, 12:20

... set of candidates. This computational advantage is the main reason that we adopt the local model in this paper. 3.3 Global versus Local Models Both the global and the localized log-linear models ... paper, we present a block-based model for statis- tical machine translation. A block is a pair of phrases which are translations of each other. For example, Fig. 1 shows an Arabic-English translation ... Boston, MA, May. Christoph Tillmann and Fei Xia. 2003. A Phrase-based Unigram Model for Statistical Machine Translation. In Companian Vol. of the Joint HLT and NAACL Confer- ence (HLT 03), pages...

Ngày tải lên: 20/02/2014, 15:20

... for cepstral mean normalisation (CMN) and cep- stral mean and variance normalisation (CMVN). Stage 2: A local-match distance matrix is then calculated by measuring the cosine distance be- Speech ... lan- guage and building a lexicon, whereas grammar is learnt via non -statistical methods later on. Sei- denberg et al. (2002) believe that learning grammar begins when statistical learning ... the computational and mathematical methods to those that model be- havioural data of human speech perception and production within five main areas: Front-end Processing: Research and devel- opment...

Ngày tải lên: 22/02/2014, 02:20

... co-occurrence analysis oper- ate over large corpora, which are typically unavail- able for a lost language. Finally, Knight and Yamada (1999) and Knight et al. (2006) describe a computational HMM- based ... structural sparsity constraints on character-level mappings. We assume that an ac- curate alphabetic mapping between related lan- guages will be sparse in the following way: each letter will map to a ... Publishers. Benjamin Snyder and Regina Barzilay. 2008. Cross- lingual propagation for morphological analysis. In Proceedings of the AAAI, pages 848–854. Wilfred Watson and Nicolas Wyatt, editors. 1999. Handbook...

Ngày tải lên: 17/03/2014, 00:20

... Lexical Chain Features 4.1 Chain starts and ends We follow (Chan et al. 2007) to model the lexi- cal chain starts and ends at a story boundary with a statistical distribution. We apply a window ... consideration and statistically modeled. 2 Experimental Setup Experiments are conducted using data from the TDT-2 Voice of America Mandarin broadcast. In particular, we only use the data from ... terms and locating instances of time where the count of chain starts and ends (boun- dary strength) achieves local maxima. Chan et al. (2007) enhanced this approach through statistical modeling...

Ngày tải lên: 23/03/2014, 17:20

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Ngày tải lên: 05/09/2013, 16:30

Ngày tải lên: 06/09/2013, 05:48

... first solve (1) and (2) simultaneously numerically, and then integrate (3) to obtain the function A   . 32.3 Calibration Let  0  0 be given. The value at time t of a bond maturing at time t + ... , 1 2  2 2 C 2 2  ; (3) A 0 = 0; Chapter 32 A two-factor model (Duffie & Kan) Let us define: X 1 t= Interest rate at time t X 2 t= Yield at time t on a bond maturing at time t +  0 Let X 1 0 ... CHAPTER 32. A two-factor model (Duffie & Kan) 321 32.2 Zero-coupon bond prices The value at time t  T of a zero-coupon bond paying $1 at time T is B t; T =IE " exp  , Z T t X 1 u...

Ngày tải lên: 18/10/2013, 02:20

... portals. It is essentially the organizational culture and employee attitudes toward change that matter. Organizational Factors Organizational factors include organizational culture, opportunities ... employees, they may impact the remaining two. For instance, managers may develop an organizational culture that facilitates the implementation of changes, and specifically technological changes. To ... technology and particularly the Internet and the World Wide Web has dramatically changed how organizations operate. The most far-reaching changes to careers are coming from transformations of work and...

Ngày tải lên: 24/10/2013, 08:20

... transition. As mentioned in an earlier chapter, the density may attain values that are substantially higher than random close packing, and quite close to the crystalline limit [131, 132]. An analogous ... investigations. The model [174] is based on the generalisation of an earlier cellular automaton (CA) model [22, 75, 83, 165] of an avalanching sandpile. This version of the model contains only near-neighbour ... very asymmetrically shaped, and there is a strong preferred orientation, the nonequilibrium regime of granular dynamics will carry all the usual characteristics of ageing. Now recall that that...

Ngày tải lên: 01/11/2013, 08:20

... algorithm can be summarized as follows: Assumptions — A batch of N samples of the array output y(t), that can accurately be described by the model (64.1) and (64.2) is available. The array is calibrated ... allowed to be arbitrarily spatially correlated with an unknown covariance matrix. Assumption A3 isawell- known condition that, under a weak restriction on m, guarantees DOA parameter identifiability ... scenarios, two planar wavefronts arrive from DOAs 0 ◦ and 5 ◦ relative to the array broadside. Unless otherwise stated, the emitter signals are zero-mean Gaussian with signal covariance matrix...

Ngày tải lên: 08/11/2013, 12:15