multicriteria data structures - pages.di.unipi.itpages.di.unipi.it/vinciguerra/talk/academic... ·...

˜

MulticriteriaData Structures

GIORGIO VINCIGUERRA

PhD student in Computer Sciencegiorgio.vinciguerra@phd.unipi.it

1

˜Outline

1. Background

2. What is a multicriteria data structure?

3. An example and preliminary results

2

˜Background concepts

DataStructures

How to store and organise data in order to facilitate efficient access

and modifications

Optimisation

How to select the best data structure from a set of viable alternatives

MachineLearning

How to capture relationships

between the data and the design of

data structures

3

˜An informal definition

A multicriteria data structure selects the best data structure within some performance and computational constraints

4

˜A classic problem in computer science

We are given a set of “objects”, and we are asked to store them succinctly and to support efficient retrieval

DATABASES SEARCH ENGINES

SOCIAL NETWORKS

SOME APPLICATIONS

5

˜A classic problem in computer science

We are given a set of “objects”, and we are asked to store them succinctly and to support efficient retrieval

CONSTRAINTS

SPACE TIME

6

Why space?

Why time?

Why space and time?

˜The idea behind the proposed solution

G. Vinciguerra, P. Ferragina, M. Miccinesi. “Superseding traditional indexes by orchestrating learning and geometry”. 2019. arXiv:1903.00507

Po

siti

on

s

Objects

10

˜Preliminary results

← Faster

← L

ess

sp

ace

-h

un

gry

G. Vinciguerra, P. Ferragina, M. Miccinesi. “Superseding traditional indexes by orchestrating learning and geometry”. 2019. arXiv:1903.00507

CSS-tree

B+-tree

Our solution

11

˜Preliminary results (cont.)

12

vs

˜Preliminary results (cont.)

13

vs

˜Knowledge is like a sphere; the greater its volume, the larger its contact with the unknown.― Blaise Pascal

GIORGIO VINCIGUERRAPhD student in Computer Science

http://pages.di.unipi.it/vinciguerra/

giorgio.vinciguerra@phd.unipi.it