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ARISTOTLE UNIVERSITY OF THESSALONIKI

ARISTOTLE UNIVERSITY OF THESSALONIKI. Word Category Map Creation A. Georgakis, C. Kotropoulos, I. Pitas. ARISTOTLE UNIVERSITY OF THESSALONIKI. Dimensionality reduction.

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ARISTOTLE UNIVERSITY OF THESSALONIKI

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  1. ARISTOTLE UNIVERSITY OF THESSALONIKI Word Category Map Creation A. Georgakis, C. Kotropoulos, I. Pitas HYPERGEO 1st technical verification

  2. ARISTOTLE UNIVERSITY OF THESSALONIKI Dimensionality reduction • Due to the size of the feature vectors two techniques were applied in order to reduce the dimensionality of the input space, to increase the overall performance and the speed: • Random projection: • a small fraction of each vector’s co-ordinates is kept for further processing. HYPERGEO 1st technical verification

  3. ARISTOTLE UNIVERSITY OF THESSALONIKI • Fast winner search: • from the remaining co-ordinates those with the highest variance were used to determine the “winning” node. • Dimension of the original space: 512 • Dimension of the sub-space : 256-512 • The fast winner algorithm gave as the same winner as in the full search for sub-space dimension detween 350-512. • With the that techique the above timings were achived in finding the “global” and the “tentative” winner. HYPERGEO 1st technical verification

  4. ARISTOTLE UNIVERSITY OF THESSALONIKI HYPERGEO 1st technical verification

  5. ARISTOTLE UNIVERSITY OF THESSALONIKI xi mi The ANN we used consited of nearly 650 neurons arranged on a hexagonal lattice. That topology was selected for visualization reasons. Nearly 6500 feature vectors were clustered in the training phase with the above network. HYPERGEO 1st technical verification

  6. ARISTOTLE UNIVERSITY OF THESSALONIKI HYPERGEO 1st technical verification

  7. ARISTOTLE UNIVERSITY OF THESSALONIKI (1,13) node clarksburg divers glasgow hump monasteri part portug roman romn tel (9,13) node burjasot catacomb centr cid comfort culmin histor miss novemb pelagio piedra pride silesia stit (11,15) node abdul arco belmaco creme fresco got gothic liter masstourist mediev mourn palac riunion rua splendid (13,14) node american central montreal perch process produc raymond romant scienc serv triumphal unusu upgrad venic (22,4) node artwork impoverish museo personalis rainer spindleruv tourism veranda vouli (23,14) node backpack born calahorra citi highland huelva marri mountain nice pseudo student victor (24,15) node anaya andov basqu beauti build doric extremadura fu goddess ibiza magic monasterio pulpit stone visit (25,15) node arrebatacapa bedroom danc mobil orlean peplo street therapeut torno tour Some of the characteristic nodes on the network HYPERGEO 1st technical verification

  8. ARISTOTLE UNIVERSITY OF THESSALONIKI Future objectives Work done so far HYPERGEO 1st technical verification

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