Tài liệu Báo cáo khoa học: "Analyzing the Errors of Unsupervised Learning" docx
Tài liệu Báo cáo khoa học: "Analyzing the Errors of Unsupervised Learning" docx
... that the first iteration of EM reinforces the systematic mis-takes of the supervised initializer. In the first E-step, the posterior counts that are computed summarize the predictions of the supervised ... but these methods must still dealwith the four types of errors we have identified inthis paper. One of our main contributions of this pa-per is the idea of using the meta-model to diagnose the ... on the distance from the true θ∗for the HMM as we increase the number of examples.In the unsupervised case, we use the followingprocedure to obtain a surrogate forˆθ: initialize EMwith the...
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Tài liệu Báo cáo khoa học: Seeking the determinants of the elusive functions of Sco proteins pptx
... function of the CXXXCmotif of human Sco proteins could therefore be impli-cated not only in the maturation of the CuAsite of Cox2 but also in the maintenance of cellular copperhomeostasis. The ... Blackburn NJ(2011) The essential role of the Cu(II) state of Sco in the maturation of the Cu(A) center of cytochrome oxi-dase: evidence from H135Met and H135SeM variants of the Bacillus subtilis ... capable of < 20% reconstitution of Cox2 in vitro [89] and that the effect of the histidine-to-methionine mutation on the redox potential of the CXXXC motif has not beeninvestigated, all the available...
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Tài liệu Báo cáo khoa học: Glucuronate, the precursor of vitamin C, is directly formed from UDP-glucuronate in liver pptx
... concentrations of CoASH. Both the heated liver extract and CoASH also restored (in the presence of ATP-Mg) the sensitivity to metyraponeand other xenobiotics and it is likely that the effect of the heated ... orientedtowards the lumen of the vesicles and that disruption of the vesicular membrane increases accessibility toUDP-glucuronate. Some of the detergents exerted inhi-bition of the enzymatic ... 20%, despite the presence of ATP-Mg. It is shown below that this is due to loss of the inhibitory effect of ATP-Mg, consequent to the removal of a heat-stable cofactor present in the high-speed...
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Tài liệu Báo cáo khoa học: On the mechanism of action of the antifungal agent propionate Propionyl-CoA inhibits glucose metabolism in Aspergillus nidulans doc
... for the initial decrease of the oxalo-acetate concentration in t he equilibrium due to the accumulation of NADH [25]. Lineweaver–Burk diagramswere obtained b y use of the worksheet of the programEXEL98 ... propionyl-CoA in the DmcsA-strain, the activity of methylisocitrate lyase is twice as high than that of the wild-type. The addition of acetate to these media notonly lowered the propionyl-CoA ... branch of the pentose phosphate pathway. Thiswas determined by the use of glucose-6-phosphate as the substrate and NADP as the hydrogen acceptor. Due to the use of cell-free extracts, not only the...
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Tài liệu Báo cáo khoa học: "Modeling the Translation of Predicate-Argument Structure for SMT" ppt
... on the target side;2) the predicate is not translated at all; and 3) the ARG1 argument is not moved to the left side of the predicate after translation. All of these 3 errors areavoided in the ... translation of Ap the translation of Ah the leftmost word of the translation of A the rightmost word of the translation of ATable 2: Features adopted in the argument reorderingmodel.Reordering ... semantically important,they also form a major part of the sentences.Therefore, whether verbal predicates are trans-lated correctly or not has a great impact on the translation accuracy of the whole sentence7.6Available...
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Tài liệu Báo cáo khoa học: " Mining the Web for Language Learning" pdf
... aftereach round of the mining process. The second layer consists of the extractor, the filter, the classifiers and the readability evaluator,which are applied sequentially. The extractor scans the raw ... layers. The first layer consists of the crawler and the raw web page storage. The crawler periodically downloads two kinds of webpages, which are put into the storage. The first kind of web pages ... uniquely unifies the scenarios of dictionary, machine translation, and language learn-ing. The features of the offering are based on anever-expanding data set derived from state -of -the- artweb mining...
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Tài liệu Báo cáo khoa học: "Improving the Scalability of Semi-Markov Conditional Random Fields for Named Entity Recognition" pdf
... “O”,which indicates a non-named entity. For 98.0% of the named entities in the training data of the sharedtask in the 2004 JNLPBA, the label of the preced-ing entity was “O”.In order to incorporate ... of semi-CRFsSince the purpose of the filtering is to reduce the computational cost, rather than to achieve a goodF-score by itself, we chose the threshold probabil-ity of filtering so that the ... the upper boundlength of entities, N is the length of sentence andK is the size of label set. And that of training infirst order semi-CRFs is O(K2LN). The increase of the cost is used to transfer...
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Tài liệu Báo cáo khoa học: "Evaluating the Accuracy of an Unlexicalized Statistical Parser on the PARC DepBank" docx
... by the need to balancedepth of analysis against the size of the deriva-tion space. On the Susanne corpus, the geometricmean of the number of analyses for a sentence of length n is 1.31n. The ... fifth of DepBank is held out to optimize the speed and accuracy of the three systems. Theyconclude from the results of these experiments that the cut-down XLE parser is two-thirds the speed of ... trained on the WallStreet Journal (WSJ) subset of the Penn Tree-Bank (PTB). Evaluation of these systems has beenmostly in terms of the PARSEVAL scheme usingtree similarity measures of (labelled)...
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Tài liệu Báo cáo khoa học: "Is the End of Supervised Parsing in Sight?" pdf
... investigated the effect of adding the LA Times data to the total mix of Penn’s WSJ and NANC’s WSJ. Table 4 shows the results of this experiment, where the baseline of 0 sentences thus starts with the ... consists of the computation of the shortest derivations and the extraction of subtrees, UML-DOP involves iterative training of the parameters. Once we have extracted the STSG, we compute the most ... sum of the probabilities of the derivations producing that tree. The probability of a derivation is the product of the subtree probabilities. The original DOP model in Bod (1998) takes the occurrence...
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Tài liệu Báo cáo khoa học: "Modelling the substitutability of discourse connectives" doc
... now consider how the substitutability of con-nectives affects our expectations of the value of V .If two connectives are SYNONYMS then each canalways be used in place of other. Thus we wouldalways ... q(x) = 0.these results demonstrate a three way correspon-dence between the human ratings of the similar-ity of a pair of connectives, their substitutabil-ity relationship, and their distributional ... The task was then to decide automatically which of q andqis the SYNONYM of p. The second task was identical in nature to the first,however here the relationship between p and q waseither SYNONYMY...
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