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MCQ

Explain scripts in details with example for artificial intelligence

Jun 18, 2020 Scripts, 288 Views
In this article you will learn about scripts with example

Scripts

A script is a structured representation describing a stereotyped sequence of events in a particular context.

Scripts are used in natural language understanding systems to organize a knowledge base in terms of the situations that the system should understand. Scripts use a frame-like structure to represent the commonly occurring experience like going to the movies eating in a restaurant, shopping in a supermarket, or visiting an ophthalmologist.

Thus, a script is a structure that prescribes a set of circumstances that could be expected to follow on from one another.

Scripts are beneficial because:

  • Events tend to occur in known runs or patterns.

  • A casual relationship between events exist.

  • An entry condition exists which allows an event to take place.

  • Prerequisites exist upon events taking place.

Components of a script

The components of a script include:

  • Entry condition: These are basic condition which must be fulfilled before events in the script can occur.

  • Results: Condition that will be true after events in script occurred.

  • Props: Slots representing objects involved in events

  • Roles: These are the actions that the individual participants perform.

  • Track: Variations on the script. Different tracks may share components of the same scripts.

  • Scenes: The sequence of events that occur.

Describing a script, special symbols of actions are used. These are:

                  Symbol                 Meaning    Example
ATRANS transfer a relationship give
PTRANS transfer physical location of an object go
PROPEL apply physical force to an object push
MOVE move body part by owner kick
GRASP grab an object by an actor hold
INGEST taking an object by an animal eat drink
EXPEL expel from animal’s body cry
MTRANS transfer mental information tell
MBUILD mentally make new information decide
CONC conceptualize or think about an idea think
SPEAK produce sound say
ATTEND focus sense organ listen

Example:-Script for going to the bank to withdraw money.

SCRIPT : Withdraw money

TRACK : Bank

PROPS : Money

Counter

Form

Token

Roles : P= Customer

E= Employee

C= Cashier

Entry conditions: P has no or less money.

The bank is open.

Results : P has more money.

Scene 1: Entering

P PTRANS P into the Bank

P ATTEND eyes to E

P MOVE P to E

Scene 2: Filling form

P MTRANS signal to E

E ATRANS form to P

P PROPEL form for writing

P ATRANS form to P

E ATRANS form to P

Scene 3: Withdrawing money

P ATTEND eyes to counter

P PTRANS P to queue at the counter

P PTRANS token to C

C ATRANS money to P

Scene 4: Exiting the bank

P PTRANS P to out of bank

Advantages of Scripts

  • Ability to predict events.

  • A single coherent interpretation maybe builds up from a collection of observations.

Disadvantages of Scripts

  • Less general than frames.

  • May not be suitable to represent all kinds of knowledge

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