Search Results for author: David M. W. Powers

Found 15 papers, 0 papers with code

ADABOOK & MULTIBOOK: Adaptive Boosting with Chance Correction

no code implementations11 Oct 2020 David M. W. Powers

There has been considerable interest in boosting and bagging, including the combination of the adaptive techniques of AdaBoost with the random selection with replacement techniques of Bagging.

Evaluation: from precision, recall and F-measure to ROC, informedness, markedness and correlation

no code implementations11 Oct 2020 David M. W. Powers

Commonly used evaluation measures including Recall, Precision, F-Measure and Rand Accuracy are biased and should not be used without clear understanding of the biases, and corresponding identification of chance or base case levels of the statistic.

DREAMT -- Embodied Motivational Conversational Storytelling

no code implementations19 Jul 2019 David M. W. Powers

Storytelling is fundamental to language, including culture, conversation and communication in their broadest senses.

Cultural Vocal Bursts Intensity Prediction

Informing Computer Vision with Optical Illusions

no code implementations8 Feb 2019 Nasim Nematzadeh, David M. W. Powers, Trent Lewis

Illusions are fascinating and immediately catch people's attention and interest, but they are also valuable in terms of giving us insights into human cognition and perception.

Prediction of Dashed Café Wall illusion by the Classical Receptive Field Model

no code implementations8 Feb 2019 Nasim Nematzadeh, David M. W. Powers

We demonstrate that a simple Differences of Gaussian model provides an explanatory mechanism for the illusory tilt perceived in a family of Caf\'e Wall illusion generalizes to the dashed versions of Caf\'e Wall.

The Cafe Wall Illusion: Local and Global Perception from multiple scale to multiscale

no code implementations17 Sep 2017 Nasim Nematzadeh, David M. W. Powers

We present here a precise and quantified comparison contrasting local tilt detection in the foveal sets with a global average across all of the Caf\'e Wall configurations tested in this work.

A Predictive Account of Cafe Wall Illusions Using a Quantitative Model

no code implementations19 May 2017 Nasim Nematzadeh, David M. W. Powers

This paper explores the tilt illusion effect in the Cafe Wall pattern using a classical Gaussian Receptive Field model.

Bioplausible multiscale filtering in retino-cortical processing as a mechanism in perceptual grouping

no code implementations27 Feb 2017 Nasim Nematzadeh, David M. W. Powers, Trent W. Lewis

The output of our low-level filtering model is presented for several types of Tilt Illusion, predicting that the final tilt percept arises from multiple-scale processing of the Differences of Gaussians and the perceptual interaction of foreground and background elements.

An Integer Programming Model for Binary Knapsack Problem with Value-Related Dependencies among Elements

no code implementations22 Feb 2017 Davoud Mougouei, David M. W. Powers, Asghar Moeini

Binary Knapsack Problem (BKP) is to select a subset of an element (item) set with the highest value while keeping the total weight within the capacity of the knapsack.

Characterisation of speech diversity using self-organising maps

no code implementations23 Jan 2017 Tom A. F. Anderson, David M. W. Powers

We report investigations into speaker classification of larger quantities of unlabelled speech data using small sets of manually phonemically annotated speech.

General Classification

A quantitative analysis of tilt in the Café Wall illusion: a bioplausible model for foveal and peripheral vision

no code implementations22 Sep 2016 Nasim Nematzadeh, David M. W. Powers

The biological characteristics of human visual processing can be investigated through the study of optical illusions and their perception, giving rise to intuitions that may improve computer vision to match human performance.

Throwing fuel on the embers: Probability or Dichotomy, Cognitive or Linguistic?

no code implementations1 Jul 2016 David M. W. Powers

Prof. Robert Berwick's abstract for his forthcoming invited talk at the ACL2016 workshop on Cognitive Aspects of Computational Language Learning revives an ancient debate.

Position

Visualization of Tradeoff in Evaluation: from Precision-Recall & PN to LIFT, ROC & BIRD

no code implementations3 May 2015 David M. W. Powers

Evaluation often aims to reduce the correctness or error characteristics of a system down to a single number, but that always involves trade-offs.

Specificity

Evaluation Evaluation a Monte Carlo study

no code implementations3 Apr 2015 David M. W. Powers

Over the last decade there has been increasing concern about the biases embodied in traditional evaluation methods for Natural Language Processing/Learning, particularly methods borrowed from Information Retrieval.

Information Retrieval Retrieval

What the F-measure doesn't measure: Features, Flaws, Fallacies and Fixes

no code implementations22 Mar 2015 David M. W. Powers

The F-measure or F-score is one of the most commonly used single number measures in Information Retrieval, Natural Language Processing and Machine Learning, but it is based on a mistake, and the flawed assumptions render it unsuitable for use in most contexts!

BIG-bench Machine Learning Information Retrieval +1

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