An Efficient Approximate kNN Graph Method for Diffusion on Image Retrieval

The application of the diffusion in many computer vision and artificial intelligence projects has been shown to give excellent improvements in performance. One of the main bottlenecks of this technique is the quadratic growth of the kNN graph size due to the high-quantity of new connections between nodes in the graph, resulting in long computation times. Several strategies have been proposed to address this, but none are effective and efficient. Our novel technique, based on LSH projections, obtains the same performance as the exact kNN graph after diffusion, but in less time (approximately 18 times faster on a dataset of a hundred thousand images). The proposed method was validated and compared with other state-of-the-art on several public image datasets, including Oxford5k, Paris6k, and Oxford105k

An Efficient Approximate kNN Graph Method for Diffusion on Image Retrieval

The application of the diffusion in many computer vision and artificial intelligence projects has been shown to give excellent improvements in performance. One of the main bottlenecks of this technique is the quadratic growth of the kNN graph size due to the high-quantity of new connections between nodes in the graph, resulting in long computation times. Several strategies have been proposed to address this, but none are effective and efficient. Our novel technique, based on LSH projections, obtains the same performance as the exact kNN graph after diffusion, but in less time (approximately 18 times faster on a dataset of a hundred thousand images). The proposed method was validated and compared with other state-of-the-art on several public image datasets, including Oxford5k, Paris6k, and Oxford105k

Suicide in children over two decades: 1993-2008.

Suicide rates have increased in Ireland’s youth over the past two decades. However, no research report has focussed on suicide rates in those aged under 18 – the children of Ireland. We retrieved national disaggregated age and sex-specific suicide mortality data from 1993-1998 and compared it with similar suicide mortality data from 2003-2008. Significant age (older vs younger) and sex effects (boys greater risk than girls) are apparent in both decades Suicide rates in both males and females have increased (males: 9.3 - 13.5 / 100,000), (females: 2.4 - 5.1/100,000. Suicide rates in under 15 year olds boys and girls is extremely rare for both time periods studied (1.6/100,000). Results are discussed in light of the rights of children and the obligation of the nation in this regard, as well as more child-specific and transition to adulthood-specific suicide prevention policy implications