ebook img

Introductory Notes on Agent-Based Modeling, Agent-Oriented Programming, & AMES Presenter PDF

53 Pages·2010·4.22 MB·English
by  
Save to my drive
Quick download
Download
Most books are stored in the elastic cloud where traffic is expensive. For this reason, we have a limit on daily download.

Preview Introductory Notes on Agent-Based Modeling, Agent-Oriented Programming, & AMES Presenter

IInnttrroodduuccttoorryy NNootteess oonn AAggeenntt--BBaasseedd MMooddeelliinngg,, AAggeenntt--OOrriieenntteedd PPrrooggrraammmmiinngg,, && AAMMEESS PPrreesseenntteerr:: LLeeiigghh TTeessffaattssiioonn PPrrooffeessssoorr ooff EEccoonn,, MMaatthh,, aanndd EECCppEE Iowa State University Ames, Iowa 50011-1070 http://www.econ.iastate.edu/tesfatsi/ [email protected] Last Updated: 13 June 2010 http://www.econ.iastate.edu/tesfatsi/ABMAOPAMES.LT.pdf 1 OOuuttlliinnee What is Agent-Based Modeling (ABM)? (cid:193) What is Object-Oriented Programming (OOP)? (cid:193) Agent-Oriented Programming (AOP) vs. OOP (cid:193) ABM via Computational Laboratories (cid:193) Example: (cid:193) AMES Wholesale Power Market Testbed 2 What is ABM? (cid:139) Classical Approach (Top Down): Model a system by means of parameterized differential equations − Example: Archimedes, a large-scale system of ODEs modeling pathways of disease spread under alternative possible health care response systems (cid:139) ABM Approach (Bottom Up): Model a system as a collection of interacting “agents” − Each agent is an entity encapsulating data together with methods that act on this data − Global regularities arise from the interactions of distributed agents 3 MMeeaanniinngg ooff ““AAggeenntt”” iinn AABBMM Agent = Encapsulated bundle of data and methods acting within a computationally constructed world. (cid:137)(cid:137) AAggeennttss ccaann rreepprreesseenntt:: - Individuals (consumers, traders, entrepreneurs,…) - Social groupings (households, communities,…) - Institutions (markets, corporations, gov’t agencies,…) - Biological entities (crops, livestock, forests,…) - Physical entities (weather, landscape, electric grids,…) 4 Partial depiction of agents for a macroeconomic ↑ ↓ ABM with “is a” and “has a” relations 5 MMeeaanniinngg ooff ““AAggeenntt”” iinn AABBMM …… CCoonnttiinnuueedd DDeecciissiioonn--mmaakkiinngg aaggeennttss ((DDMMAAggeennttss)) are capable (in different degrees) of (cid:121) BBeehhaavviioorraall aaddaappttaattiioonn (cid:121)(cid:121) GGooaall--ddiirreecctteedd lleeaarrnniinngg (cid:121) SSoocciiaall ccoommmmuunniiccaattiioonn ((ttaallkkiinngg wwiitthh eeaacchh ootthheerr!!)) (cid:121)(cid:121) EEnnddooggeennoouuss ffoorrmmaattiioonn ooff iinntteerraaccttiioonn nneettwwoorrkkss (cid:121) AAuuttoonnoommyy:: SSelf-activation and self-determination based on privateinternaldata and methods as well as on external data streams (including from real world) 6 Importance of Agent Encapsulation • In the real world, all calculations must be done by entities actually residing in the world. • ABM forces modelers to respect this constraint. • Procedures encapsulated into the methods of a particular agent can only be implemented using the particular resources available to that agent. • This encapsulation achieves a more transparent and realistic representation of real-world systems composed of interacting distributed entities with limited information and computational capabilities. 7 CCoonnssttrruuccttiivvee RReeppllaacceemmeenntt In principle, as a result of agent encapsulation: (cid:146) Any decision-making agent interacting within an ABM through a particular input-output public interface can be replaced by a person that interacts with the ABM through this same public interface. • Since method implementationsby the decision-making agent and its human replacement need not be the same, the resulting outcomes under replacement could differ. • The only claim here is the feasibilityof replacement due to the imposition of agent boundaries in ABMs. 8 RRoollee ooff EEqquuaattiioonnss (cid:139) Any agent in an ABM can have data and/or methods involving equations. (cid:139) These equations can be the basis in part or in whole for the agent’s actions. (cid:139) ABM world events are driven solely by the aaccttiioonnss undertaken by the ABM agents within their world. (cid:139) ABM world events are nnoott driven by equations existing oouuttssiiddeeof the data and methods of agents. For example, “sky hook” equilibrium conditions are not permitted. 9 AABBMM aanndd IInnssttiittuuttiioonnaall DDeessiiggnn KKeeyy IIssssuueess:: (cid:144) Will a proposed or actual design promote efficient, fair, and orderly social outcomes over time? (cid:144) Will the design give rise to unintended consequences? AABBMM CCuullttuurree--DDiisshh AApppprrooaacchh:: (cid:144) Develop a computational world embodying the design, physical constraints, strategic participants, … (cid:144) Set initial world conditions (agent states). (cid:144) Let the world evolve with no further intervention, and observe and evaluate the resulting outcomes. 10

Description:
What is Agent-Based Modeling (ABM)? What is Object-Oriented Programming (OOP)? Agent-Oriented . A class C can inherit the data and methods.
See more

The list of books you might like

Most books are stored in the elastic cloud where traffic is expensive. For this reason, we have a limit on daily download.