glm apos s with application to log linear models

... Exploratory Search Exploratory search addresses the need of users to quickly identify the important pieces of information in a target set of documents In exploratory search, users are presented with ... presented with a result set and a set of exploratory facets, which are proposals for refinements of the query that can lead to more focused sets of documents Each facet corresponds to a clustering of ... nodes of an entailment graph correspond to propositional templates, and its edges correspond to entailment relations (rules) between them Entailment graph representation is somewhat analogous to...

Ngày tải lên: 07/03/2014, 18:20

... approach to training a log- linear model is to use stochastic gradient descent (SGD) methods SGD uses approximate gradients estimated from subsets of the training data and updates the weights of the ... descent method for L1-regularized loglinear models Experimental results are presented in Section Some related work is discussed in Section Section gives some concluding remarks Log- Linear Models ... accurate models much more quickly than the OWL-QN algorithm This paper is organized as follows Section provides a general description of log- linear models used in NLP Section describes our stochastic...

Ngày tải lên: 17/03/2014, 01:20

... by using supertags instead of POS tags in the dataset With POS tags we , but with supertags we achieve an F-score of only achieve an F-score of This is not surprising becuase Srinivas’ supertag ... input sentence, its POS tag, instead of the supertag of the previous word, is used to select the corresponding SNoW classifier This method helps to avoid the sparse data problem and forces SNoW to ... treat POS tags One approach is to assign POS tags at the same time that we supertagging The other approach is to assign POS tags with a traditional POS tagger first, and then use them as input to the...

Ngày tải lên: 17/03/2014, 06:20

... Analogous to the test functions S( R) and the tempered distributions S (R) on the real line R, there is a useful space of stochastic test functions (S) and a space of stochastic distributions (S) ∗ ... (s3 , s2 , s1 , ω); ≤ s3 ≤ s2 such that s2 E[ ϕ2 (s3 , s2 , s1 , ω)ds3 ] ≤ E[ϕ2 (s2 , s1 )] < ∞ (1.25) and s2 (1.26) ϕ2 (s2 , s1 , ω) = E[ϕ2 (s2 , s1 , ω)] + ϕ3 (s3 , s2 , s1 , ω)dW (s3 ) Substituting ... T g1 (s1 )dW (s1 ) + T s1 ( g2 (s2 , s1 )dW (s2 ))dW (s1 ) 0 s s2 + ( ( ϕ3 (s3 , s2 , s1 , ω)dW (s3 ))dW (s2 ))dW (s1 ), (1.27) 0 where g2 (s2 , s1 ) = E[ϕ2 (s2 , s1 )]; (1.28) ≤ s2 ≤ s1 ≤ T...

Ngày tải lên: 09/04/2014, 13:45

... is assumed constant: this is usually so, but not always, as for example in the case of a rocket burning fuel The spring stiffness k is assumed constant: this is usually so within limits; see section ... the actual system response to specific excitations It is necessary to know the actual response in order to determine such quantities as dynamic stress, noise, output position, or steady-state error ... been given above to show how real systems can be modelled, and the principles of their analysis To be competent to analyse system models it is first necessary to study the analysis of damped and...

Ngày tải lên: 04/06/2014, 13:23

... RESPONSE Sinusoidal signals play an important role in linear system analysis, as a linear system responds to a sinusoid in a sinusoidal fashion Consider, for instance, a spatially rectangular sinusoid ... enables us to design efficient systems for a particular application The most practical of all systems is the linear system, as it gives us the power to obtain closed-form solution to the analysis ... the system in b is nonlinear 2.2.2 Space Invariant Systems A 2-D discrete system is said to be space invariant if a shifted input results in a shifted output That is, if the system response to...

Ngày tải lên: 05/06/2014, 11:57

... proposed method cannot be obtained at arbitrary low SNR The performance of estimators for chaotic systems tends to degrade quite suddenly as the SNR decreases below some threshold SNR (SNRth) ... dynamics-based method; PEM: piecewise estimation method; SNR: signal-tonoise ratios; SDM: symbolic dynamics-based method Acknowledgements The authors would like to thank the suggestions of the ... likelihood estimator performance for chaotic signals in noise IEEE Trans Signal Process 43(4):1009–1012 (1995) 10 S Kay, V Nagesha, Methods for chaotic signal estimation IEEE Trans Signal Process 43(8):2013–2016...

Ngày tải lên: 21/06/2014, 03:20

... joint sparse signal reconstruction includes [23], in which the authors proposed multitask Bayesian compressive sensing (MBCS) for simultaneous joint signal reconstruction by sharing the same set ... into the current signal estimation 3.1 Bayesian Compressed Sensing Framework Starting with Gaussian distributed noise, the BCS framework [5, 21] builds a Bayesian regression approach to reconstruct ... MBCS and BCS using different types of signals, different similarity levels, noise powers, and measurement numbers 6.1 Spike Signal We first generate four scenarios of spike signals with the same length...

Ngày tải lên: 21/06/2014, 05:20

... a firstorder Markov assumption on the probability for observing a sequence s1 s2 s3 s4 · · · sn ” is P (S1 = s1 , , Sn = sn ), = P (S1 = s1 )P (S2 = s2 | S1 = s1 ) · · · (1) × P(Sn = sn | Sn−1 ... Discussion and Conclusions of position-dependent emissions, the performances of the results drop sharply as shown in Figures and This is because the strong information at the transitions, such ... model is a “doubly embedded stochastic process with an underlying stochastic process that is not observable, but can only be observed through another set of stochastic process that produce the sequence...

Ngày tải lên: 21/06/2014, 08:20

... approaches decompose image signals into lowpass and highpass coefficients via a multiresolution decomposition scheme, fuse lowpass and highpass coefficients according to specific fusion rules, and perform ... to withstand minor registration differences, the source images to be fused are assumed to be registered Misregistered source images should be subjected to registration preprocessing steps independent ... model makes use of a logarithmic isomorphic transformation, consistent with the fact that the human visual system processes light logarithmically The model has also shown to satisfy Weber s Law,...

Ngày tải lên: 21/06/2014, 08:20

... images from each subject to compose the test set of the ORL (AR) database Among the remaining images, a subset of classes was randomly chosen The samples belonging to these classes were used for ... images have variant lighting, facial expressions (open/closed eyes, smiling/not smiling) and facial details (glasses/no glasses) They also display slight pose changes The size of each image is 92 ... expressions, illumination conditions, and occlusions (wearing sun-glasses and scarf) In our experiments, we randomly chose some images of 120 subjects and discarded the samples of wearing sun-glasses...

Ngày tải lên: 21/06/2014, 20:20

... Inequalities and Applications Since Euler s days the research of these special functions and their generalizations have had great impact on, for example, analysis, mathematical physics, and statistics ... This contradicts Inequality A Thus, there are functions such that D n, p > for all n ∈ N and all p > p / Acknowledgments The authors would like to thank Leif Persson for fruitful discussions ... operator we refer to 8, e The convex cone Ep has applications in dynamical systems and algebraic geometry see, e.g., 10, 11 A fundamental tool in working with Ep is the following energy estimate...

Ngày tải lên: 22/06/2014, 02:20

... neighborhood whose brightness is approximately the same as the brightness of the nucleus form the area referred to as univalue segment assimilating nucleus (USAN) The point (nucleus) with smallest USAN area ... columns give the percentage of the results which are the same as the clinician s assessments Columns 2–6 show the percentages where the disagreement is from to grades, respectively The last columns ... the analysis of different videos taken from the same subjects on the same day whereas clinicians have inconsistent assessments The subjects who could not finish the prescribed movements correctly...

Ngày tải lên: 22/06/2014, 19:20

... becomes Ai (0, 0, 0) ≈ E i=1 To make analysis easier, we assume ti = tn = τ which is a reasonable assumption because radar sensors can be coordinated by the clusterhead to send out LFM waveforms ... robustness, aggregating sensor nodes into clusters has additional benefits: (1) conserving radio resources such as bandwidth; (2) promoting spatial code reuse and frequency reuse; (3) simplifying ... (multiple scatter) targets can cause major changes in the radar cross section (RCS) This has been considered in the past as a means of target recognition, and is called fluctuation of radar cross section...

Ngày tải lên: 22/06/2014, 22:20

... successively projected on different convex sets Each set represents constraints to the reconstructed image that are based on the given measurements and assumptions about the signal Capel and Zisserman ... Switzerland His research interests are in signal and image processing, sampling, and digital photography Sabine S sstrunk received the B .S degree u in scientific photography from the Swiss Federal Institute ... noisy or highly aliased images (see Section 2), our algorithm only uses low-frequency information This is the part of the signals with the highest signal -to- noise ratio (SNR), and in our setup,...

Ngày tải lên: 22/06/2014, 23:20

... these simulations, our motion detection algorithm uses the same parameter values as those used in Section For object tracking, first we give results with Tracker D Figures 11 and 12 show results ... it is possible to track just based on luminance But this result shows that just luminance alone is not sufficient to track object specially on such cluttered background This video sequence is one ... Massachusetts, Amherst, University of Michigan, Ann Arbor, and General Motors Research Labs, Warren, USA He is a Senior Member of IEEE and is an Associate Editor of IEEE Transactions on Systems, Man and...

Ngày tải lên: 22/06/2014, 23:20

... (almost orthogonal) transmission scheme with the following transmission matrix:   s1 s2 s3 s4 s s s s  2 3  S=   s3 s4 s1 s2  ∗ ∗ ∗ ∗ s4 s3 s2 s1 (31) Such a transmission scheme ... Alamouti transmission scheme can be used to achieve full diversity transmission at one symbol per transmission [8] It transmits two symbols s1 and s2 over two consecutive transmissions as follows During ... antennas to transmit s1 = [s1 s2 ]T using the Alamouti scheme, and use the other pair to transmit s2 = [s3 s4 ]T also using Alamouti scheme In this way, we transmit four symbols over two transmissions...

Ngày tải lên: 23/06/2014, 01:20

... consistency costs, we propose to embed the system within a probabilistic framework using 2D HMMs At any location on the face, the system is considered to be in one of a finite set of states Assuming ... the vectors representing the stored faces, and then choose the stored image yielding the smallest distance [25] While PCA is optimal with respect to data compression [23], in general it is suboptimal ... fisherfaces is the fact that both algorithms assume that the intraclass variability is the same for all classes The difference is in the way to deal with this variability; while fisherfaces try to...

Ngày tải lên: 23/06/2014, 01:20

... Points correspond to data of the three stands, lines to linear adjustments on the points Estimations were done with the branch level models adjusted on each stand separately (B) Points correspond ... plots), the biological significance of the variables used as regressors, its simplicity (minimum number of regressors) and its use as an estimating tool when extrapolating to the total population ... “measured” values correspond to the estimations of tree needle area using the branch models presented in table III Points correspond to data of the three stands, lines to linear adjustments on...

Ngày tải lên: 08/08/2014, 14:21

... algorithm was used 2.2.5 Comparison of Models The Bayes factor, as defined by Newton and Raftery [11], was used to assess the plausibility of the models postulated The marginal density of the ... 000 samples Analysis was based on 50 000 additional samples, drawn without thinning RESULTS AND DISCUSSION The posterior mean for heritability of liability to mastitis was 0.05 using the first ... was assumed constant along lactation Even though the data set used in this analysis was too small to draw a definite conclusion on genetic parameters, this estimate was similar to the values found...

Ngày tải lên: 14/08/2014, 13:22