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282
Kinetic trajectory decoding using motor cortical ensembles,” 2007, submitted
"... Although most brain-machine interface studies have focused on decoding kinematic parameters of motion such as hand position and velocity, it is known that motor cortical activity also correlates with kinetic signals, including active hand force and joint torque. Here, we attempted to reconstruct tor ..."
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Cited by 3 (1 self)
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Although most brain-machine interface studies have focused on decoding kinematic parameters of motion such as hand position and velocity, it is known that motor cortical activity also correlates with kinetic signals, including active hand force and joint torque. Here, we attempted to reconstruct torque trajectories of the shoulder and elbow joints from the activity of simultaneously recorded units in primary motor cortex (MI) as monkeys (Macaca Mulatta) made reaching movements in the horizontal plane. Using a linear filter decoding approach that considers the history of neuronal activity up to one second in the past, we found reconstruction performance nearly equal to that of Cartesian hand position, despite the considerably greater bandwidth of the torque signals. The addition of delayed position and velocity feedback to the decoder generated consistently better torque reconstructions, suggesting that simple limb-state feedback may be useful to optimize brain-machine interface performance. 1
Semantic Texton Forests for Image Categorization and Segmentation
"... We propose semantic texton forests, efficient and powerful new low-level features. These are ensembles of decision trees that act directly on image pixels, and therefore do not need the expensive computation of filter-bank responses or local descriptors. They are extremely fast to both train and tes ..."
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Cited by 304 (13 self)
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We propose semantic texton forests, efficient and powerful new low-level features. These are ensembles of decision trees that act directly on image pixels, and therefore do not need the expensive computation of filter-bank responses or local descriptors. They are extremely fast to both train
Kernels and Ensembles
"... Description The support vector machine and the AdaBoost algorithm have spawned a wave of research in statistical machine learning. This course will focus on the basic ideas behind these algorithms. The first one is: we can transform many classical linear algorithms into highly flexible nonlinear alg ..."
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algorithms by using kernel functions. The second one is: we can make accurate predictions by building an ensemble of relatively simple-minded models rather than carefully fine-tuning a single model. I will begin the course, however, with a few basic nonparametric techniques. This is partly because some
Dependency parsing and domain adaptation with LR models and parser ensembles
- In Proceedings of the Eleventh Conference on Computational Natural Language Learning
, 2007
"... We present a data-driven variant of the LR algorithm for dependency parsing, and extend it with a best-first search for probabilistic generalized LR dependency parsing. Parser actions are determined by a classifier, based on features that represent the current state of the parser. We apply this pars ..."
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Cited by 88 (8 self)
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this parsing framework to both tracks of the CoNLL 2007 shared task, in each case taking advantage of multiple models trained with different learners. In the multilingual track, we train three LR models for each of the ten languages, and combine the analyses obtained with each individual model with a maximum
TM (2007). “Comparison of Ensemble-MOS Methods Using
- GFS Reforecasts.” Monthly Weather Review
"... Three recently proposed and promising methods for postprocessing ensemble forecasts based on their historical error characteristics (i.e., ensemble-model output statistics methods) are compared using a multidecadal reforecast dataset. Logistic regressions and nonhomogeneous Gaussian regressions are ..."
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Cited by 11 (0 self)
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Three recently proposed and promising methods for postprocessing ensemble forecasts based on their historical error characteristics (i.e., ensemble-model output statistics methods) are compared using a multidecadal reforecast dataset. Logistic regressions and nonhomogeneous Gaussian regressions
improve performance of the Ensembl website
"... Background: The Ensembl web site has provided access to genomic information for almost 10 years. During this time the amount of data available through Ensembl has grown dramatically. At the same time, the World Wide Web itself has become a dramatically more important component of the scientific work ..."
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workflow and the way that scientists share and access data and scientific information. Since 2000, the Ensembl web interface has had three major updates and numerous smaller updates. These have largely been in response to expanding data types and valuable representations of existing data types. In 2007
2007), Scalable implementations of ensemble filter algorithms for data assimilation
- J. Atmos. Oceanic Technol
"... ABSTRACT A variant of a least squares ensemble (Kalman) filter that is suitable for implementation on parallel architectures is presented. This parallel ensemble filter produces results that are identical to those from sequential algorithms already described in the literature when forward observati ..."
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Cited by 24 (3 self)
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ABSTRACT A variant of a least squares ensemble (Kalman) filter that is suitable for implementation on parallel architectures is presented. This parallel ensemble filter produces results that are identical to those from sequential algorithms already described in the literature when forward
Ensemble Optimal Interpolation: multivariate properties
- in the Gulf of Mexico, Tellus
"... (Manuscript submitted on the 26/09/2007) High-resolution models can reproduce mesoscale dynamics and the variability in the Gulf of Mexico (GOM), but cannot provide accurate locations of currents without data assimilation (DA). We use the computationally cheap Ensemble Optimal Inter-polation (EnOI) ..."
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Cited by 14 (3 self)
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(Manuscript submitted on the 26/09/2007) High-resolution models can reproduce mesoscale dynamics and the variability in the Gulf of Mexico (GOM), but cannot provide accurate locations of currents without data assimilation (DA). We use the computationally cheap Ensemble Optimal Inter-polation (En
Ensemble Approach for the Classification of Imbalanced Data
"... Abstract. Ensembles are often capable of greater prediction accuracy than any of their individual members. As a consequence of the diversity between individual base-learners, an ensemble will not suffer from overfitting. On the other hand, in many cases we are dealing with imbalanced data and a clas ..."
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Cited by 4 (0 self)
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Abstract. Ensembles are often capable of greater prediction accuracy than any of their individual members. As a consequence of the diversity between individual base-learners, an ensemble will not suffer from overfitting. On the other hand, in many cases we are dealing with imbalanced data and a
ensemble transform Kalman filter (ETKF)
"... ABSTRACT: The spatial characteristics of ensemble transform Kalman filter (ETKF) sensitive area predictions (SAPs) are explored using ensemble forecasts from the European Centre for Medium-Range Weather Forecasts for the period of the 2003 North Atlantic THORPEX Regional Campaign. The ensemble size ..."
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ABSTRACT: The spatial characteristics of ensemble transform Kalman filter (ETKF) sensitive area predictions (SAPs) are explored using ensemble forecasts from the European Centre for Medium-Range Weather Forecasts for the period of the 2003 North Atlantic THORPEX Regional Campaign. The ensemble size
Results 1 - 10
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282