Báo cáo khoa học: "An Effective Two-Stage Model for Exploiting Non-Local Dependencies in Named Entity Recognition" pdf

... gen- eration and modeling of in ected forms un- observed in training data and decoding proce- dures for a model with non-local target-side feature dependencies. 1 Introduction Translation into languages ... restric- tions: • For nouns, generated forms had to match the original form for number. • For verbs, generated forms had to match the original form for tense and negatio...

Ngày tải lên: 07/03/2014, 22:20

... and in running experiments we determined that poorly modeling this distribution gave slightly worse performance than not modeling it at all, so in practice we drop this term. 3 Training the Model To ... Model To train the model, we need a training set consisting of {s i , w i } string pairs, representing spelling errors s i paired with the correct spelling of the word w i . We begin...

Ngày tải lên: 23/03/2014, 19:20

... Linguistics An Effective Two-Stage Model for Exploiting Non-Local Dependencies in Named Entity Recognition Vijay Krishnan Computer Science Department Stanford University Stanford, CA 94305 vijayk@cs.stanford.edu Christopher ... compet- itive baseline CRF using local information alone, whose performance is close to the best published local CRF models, for Named Entity...

Ngày tải lên: 31/03/2014, 01:20

... re-ranking model performs rather well for a limited number of candidate structures, and out- performs Charniak’s model when k = 5. In this case we observe a small boost in performance for the ... likelihoods of generating three aspects of the structure, according to the three models (BGM, BEM, WFM) specified in equations (2-4) and explained in the main text. 3 A probabilistic...

Ngày tải lên: 20/02/2014, 04:20

... phrase-based and syntax- based models. For efficient integration of n- gram language model into decoding, rules containing more than two variables are binarized into binary rules. In addition to the ... of decoding algorithms. For example, the toolkit has several useful decoding options, including: standard phrase-based decoding, decoding as parsing, decoding as tree-parsing, a...

Ngày tải lên: 19/02/2014, 20:20

... regression model to enable scoring of sentences in test document clusters without re- training, (which has not been investigated in gen- erative summarization models) described in § 5.2. We show in § ... work, in that, we combine a generative hierarchical model and re- gression model to score sentences in new docu- ments, eliminating the need for building a genera- tive m...

Ngày tải lên: 20/02/2014, 04:20

... a growing research interest in opinion retrieval as on-line users’ opinions are becom- ing more and more popular in business, social networks, etc. Practically speaking, the goal of opinion ... (i.e. opinion) of a sentence. Word pairs can maintain intra-sentence contextual information to express the potential relevant opinions. In addi- tion, inter-sentence contextual information...

Ngày tải lên: 20/02/2014, 04:20

... meth- ods for language models applied to ad hoc information retrieval. In Proceedings of SIGIR, pages 334-342. 662 Proceedings of the 49th Annual Meeting of the Association for Computational Linguistics, ... translation models, the phrase- based translation model is more effective be- cause it captures contextual information in modeling the translation of phrases as a whole, rathe...

Ngày tải lên: 20/02/2014, 04:20

... Yunqing Xia Linlin Wang Center for Speech and language Tech. State Key Lab of Intelligent Tech. and Sys. RIIT, Tsinghua University Dept. of CST, Tsinghua University Beijing 100084, China Beijing ... 100084, China yqxia@tsinghua.edu.cn wangll07@mails.tsinghua.edu.cn Kam-Fai Wong Mingxing Xu Dept. of SE&EM Dept. of CST The Chinese University of Hong Kong Tsinghua University Sha...

Ngày tải lên: 20/02/2014, 09:20

... word spacing errors and spelling errors separately. Word spacing algo- rithms define the problem as a task for determining whether to insert the delimiter between characters or not. Since the ... dictionary for these special cases. 3 A Joint Statistical Model for Word Spacing and Spelling Error Correction 3.1 Problem Definition Given a sentence T which includes both word spa...

Ngày tải lên: 20/02/2014, 12:20