Noisy fitness evaluation in genetic algorithms and the dynamics of learning

A theoretical model is presented which describes selection in a genetic algorithm (GA) under a stochastic fitness measure and correctly accounts for finite population effects. Although this model describes a number of selection schemes, we only consider Boltzmann selection in detail here as results for this form of selection are particularly transparent when fitness is corrupted by additive Gaussian noise. Finite population effects are shown to be of fundamental importance in this case, as the noise has no effect in the infinite population limit. In the limit of weak selection we show how the effects of any Gaussian noise can be removed by increasing the population size appropriately. The theory is tested on two closely related problems: the one-max problem corrupted by Gaussian noise and generalization in a perceptron with binary weights. The averaged dynamics can be accurately modelled for both problems using a formalism which describes the dynamics of the GA using methods from statistical mechanics. The second problem is a simple example of a learning problem and by considering this problem we show how the accurate characterization of noise in the fitness evaluation may be relevant in machine learning. The training error (negative fitness) is the number of misclassified training examples in a batch and can be considered as a noisy version of the generalization error if an independent batch is used for each evaluation. The noise is due to the finite batch size and in the limit of large problem size and weak selection we show how the effect of this noise can be removed by increasing the population size. This allows the optimal batch size to be determined, which minimizes computation time as well as the total number of training examples required.

Human resource development for inclusive procurement by intermediation:a situated learning theory application

This paper fills an important gap in the human resource development (HRD) literature by considering the role that NGO intermediation initiatives can play in bringing together and developing corporate procurement officials (CPOs) and ethnic minority business owner-managers (EMBOs) supplying goods and services. It has been suggested that such initiatives hold great promise in helping ethnic minority businesses escape from their disadvantageous sectoral concentration in the UK. Using situated learning theory as an application lens, the main aim of this paper is to demonstrate how nurturing communities of practice of CPOs and EMBOs and facilitating their interaction can help their professional development and their approaches to procuring and supplying, respectively. The paper reports on the authors' experience with an action research programme encompassing two intermediation initiatives of this kind. The lessons drawn from this study are useful for all those concerned with HRD for inclusive procurement; intermediaries promoting inclusive procurement, large procurers who are willing to engage with supplier diversity and ethnic minority suppliers who wish to access corporate procurement systems and 'break-out'. © 2013 Taylor & Francis.

Inclusive education and intellectual disability:a sociological engagement with Martha Nussbaum

As a result of exclusionary tactics, social, cultural or economic disadvantage or disability, vast numbers of pupils have poor educational experiences and are either marginalised or demonised due to 'difficult differences'. In the context of Martha Nussbaum's capabilities approach, where she suggests that we ought to be who we want to be, this paper addresses intellectual disability, inclusion and inclusive education. It proposes that care, compassion, creativity and ethics are critical in understanding the education for all children and young people, rather than necessarily pedagogical process. In addition, it suggests that learning should take place within and through relationships and that these relationships are important in developing a healthy sense of self. Therefore politically, rather than following a path of blame whether it is the dysfunctional family, the deficit child or the economically deprived nation, this paper says that we require socially just practices, compassion and care as fundamental to human development, social inclusion and inclusive education. Ultimately, education is failing a large sum of children and young people and therefore needs to be radically reconsidered.

Experiencing an 'inclusive' education:parents and their children with 'special educational needs'

This paper focuses on the experiences of British parents who have children identified with ‘special education needs’ within mainstream education. Expectations of mainstream education can have a negative affect on parents when a child is unable to maintain his or her education within a mainstream school. In England and Wales, ‘inclusion’ within mainstream schools is implemented by the current government and promoted as anti-exclusionary. However, current research indicates that actual ‘inclusion’ (the child experiencing inclusion as well as being placed in a mainstream environment) is not necessarily occurring in practice. As it stands, the conflict is between desires to embrace difference based on a philosophy of ‘equal rights’ (‘inclusive’ education) and prioritising educational performance, structuring it in such a way that it leaves little room for difference and creativity due to the highly structured testing and examination culture. Qualitative analysis of parents who have children identified with special educational needs indicate that they have hopes and expectations for their children. These hopes and expectations are challenged recurrently.

Fitness and novelty in evolutionary art

In this paper the effects of introducing novelty search in evolutionary art are explored. Our algorithm combines fitness and novelty metrics to frame image evolution as a multi-objective optimisation problem, promoting the creation of images that are both suitable and diverse. The method is illustrated by using two evolutionary art engines for the evolution of figurative objects and context free design grammars. The results demonstrate the ability of the algorithm to obtain a larger set of fit images compared to traditional fitness-based evolution, regardless of the engine used.

Procedural justice in procurement management and inclusive interorganizational relations:An institutional perspective

This paper applies the concept of procedural justice to one of the most important focal points of interorganizational relations: the purchaser-supplier relationship. The few extant studies of the concept in the purchaser-supplier domain have overlooked an important aspect of this key relationship: that is, inclusiveness in procurement. This is despite the fact that interest in the specific empirical context of supply chain links between large purchasing organizations (LPOs) and ethnic minority suppliers (EMSs) from disadvantaged communities proceeds apace on both sides of the Atlantic. Institutional theory is used to examine the form that procedural justice takes in eight case studies of LPOs from the private and public sectors, which actively engage with inclusive procurement management initiatives in England. The guiding question is twofold: 'What may LPO approaches to installing procedural justice in procurement management entail?' and 'How are these approaches shaped?' This paper identifies specific approaches to installing procedural justice for inclusive procurement and submits theoretical propositions about how these are shaped. The study contributes to a macro-level assessment of procedural justice, i.e. interorganizational procedural justice, as a significant aspect of inclusive interorganizational relationships, which is a domain in need of theoretical development.

The sound of silence. Lesbian, gay, bisexual and transgender discrimination in 'inclusive organizations'

Most studies on diversity and discrimination in the workplace have focused on 'visible' minorities such as gender or race, often neglecting the experiences of invisible minorities such as lesbian, gay, bisexual and transgender (LGBT) workers. In this paper we explore the practices of inclusion/exclusion of LGBTs in the workplace in Italian social cooperatives, which are specifically founded to create employment for people who are disadvantaged in the labour market. The study examines how organizations, which have an ethos focused on inclusion and mainly employ workers from specific social minority groups, manage the inclusion of LGBT workers. We also explore the experience of LGBT workers within these organizations. The paper reports that the culture of silence existing in the five organizations studied prevents LGBT employees from constructing a work identity which encompasses their sexual identity and prevents the organizations from achieving their aim of being fully inclusive workplaces. © 2013 British Academy of Management.

Survey of General Optical Council disciplinary and fitness to practise hearings:2001-2011

The aim of this survey was to review 187 transcripts from the United Kingdom’s General Optical Council (GOC) Disciplinary and Fitness To Practise (FTP) Committee hearings from 2001 to 2011 in order to identify common themes and thereby help practitioners to avoid the more frequently occurring pitfalls that were recorded during this period. The study covered changes in GOC FTP regulations in 2005, which involved a change from a disciplinary to a fitness to practise process. The number of cases was very small compared to the total number of optometrist and dispensing optician registrants, which was 13709 in 2001-02 rising to 18582 in 2010-11. The main findings indicated that between 2001 and 2011 there was a three times greater likelihood that male registrants versus female registrants would be brought in front of a GOC Disciplinary or FTP Committee. In terms of erasures from the GOC registers between 2001 and 2011, male registrants were also more likely to be erased than females. The male: female split for erasures between 2001 and 2011 was five: one, increasing to seven: one when considering the situation post the 2005 GOC FTP rule change. Of the cases brought before the Disciplinary and FTP Committees between 2001 and 2011, it was noted that cases implicating theft and fraud were most frequent representing 27% of hearings examined (17% involving NHS fraud and 10% theft or fraud from an employer). The examination of transcripts revealed other hearings were more complex. These hearings often had a primary reason for the investigation that highlighted further secondary concerns that also required investigation.