Rescuing 1 sources and tagging 0 as dead.) #IABot (v2.0.9.5
(15 intermediate revisions by 10 users not shown)
Line 1:
A '''partially observable system''' is one in which the entire state of the system is not fully visible to an external [[sensor]]. In a partially observable system the observer may utilise a memory system in order to add information to the observer's understanding of the system.<ref>[[Peter Norvig]], [[Sebastian Thrun]]. [[Udacity]]: [https://www.udacity.com/wiki/cs271/unit1_notes Introduction to Artificial Intelligence] {{Webarchive|url=https://web.archive.org/web/20140122074421/https://www.udacity.com/wiki/cs271/unit1_notes |date=2014-01-22 }}</ref>
{{Multiple issues|
{{restructure|date=October 2011}}
{{unreferenced|date=October 2011}}
}}
AAn example of a '''partially observable''' system iswould onebe a [[card game]] in which some of the entirecards stateare ofdiscarded into a pile face down. In this case the systemobserver is not fullyonly visibleable to anview externaltheir sensorown cards and potentially those of the dealer. InThey aare partiallynot observableable systemto view the observerface-down may(used) utilisecards, anor the cards that will be dealt at some stage in the future. A memory system incan orderbe used to addremember the previously dealt cards that are now on the used pile. This informationadds to the total sum of knowledge that the observer'sunderstandingcan use to themake systemdecisions.
In contrast, a fully observable system would be that of [[chess]]. In chess (apart from the 'who is moving next' state, and minor subtleties such as whether a side has castled, which may not be clear) the full state of the system is observable at any point in time.▼
An example of a partially observable system would be a [[card game]] in which some of the cards are discarded into a pile face down. In this case the observer is only able to view their own cards and potentially those of the dealer. They are not able to view the face-down (used) cards, and nor are they able to view the cards which will be dealt at some stage in the future. A memory system can be used to remember the previously dealt cards that are now on the used pile. This adds to the total sum of knowledge that the observer can use to make decisions.
Partially observable is a term used in a variety of mathematical settings, including that of Artificialartificial Intelligenceintelligence and [[Partiallypartially observable Markov decision process]]es.▼
▲In contrast, a fully observable system would be that of [[chess]]. In chess (apart from the 'who is moving next' state) the full state of the system is observable at any point in time.
==References==
▲Partially observable is a term used in a variety of mathematical settings, including that of Artificial Intelligence and [[Partially observable Markov decision process]]es.
