no code implementations • 11 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.
no code implementations • 11 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.
no code implementations • 19 Jul 2019 • David M. W. Powers
Storytelling is fundamental to language, including culture, conversation and communication in their broadest senses.
no code implementations • 8 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.
no code implementations • 8 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.
no code implementations • 17 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.
no code implementations • 19 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.
no code implementations • 27 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.
no code implementations • 22 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.
no code implementations • 23 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.
no code implementations • 22 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.
no code implementations • 1 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.
no code implementations • 3 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.
no code implementations • 3 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.
no code implementations • 22 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!