Forward checking - artificial intelligence, Computer Engineering

Assignment Help:

Forward checking:

Whether to add some sophistication to the search method there constraint solvers use a technique called as forward checking. So here the general idea is to work the like as a backtracking search but, where checking compliance with constraints behind assigning a  value to a variable there the agent also checks when this assignment is going to break constraints with  future variable assignments. Hence is supposing that Vc has been assigned to the current variable c, after then for each unassigned variable xi, as temporarily remove all values from Di that along with Vc break a constraint. Thus it may be that in doing so, Di becomes empty. Because the choice of Vc for the current variable is bad  -  so however it will not find its way into a solution to the problem just because there's no way to assign a value to xi without breaking a constraint. In that condition even though the assignment of Vc may not break any constraints such that already assigned variables so a new value is chosen as or backtracking occurs whether there are no values left, just because we know that V  is a bad assignment. 

Here the next diagram like again, taken from Smith's tutorial to shows how forward checking improves the search for a solution to the 4-queens problem as;:. 

2484_Forward checking.png

In such a scenario to forward checking, to improve the intelligence of the constraint solving agent so there are some possibilities for a heuristic search. Therefore firstly, our agent can worry about the order such that looks at the variables, that is, in example of the 4-queens problem so it might try to put a queen in row 2, after then one in row 3, one in row 1 and then finally one in row 4. Moreover a solver taking such care is said to be utilizing a variable-ordering heuristic. Conversely the ordering of variables can be done earlier than a search  is started and rigidly adhered to during the search. In fact this might be a good idea whether there is extra knowledge about the problem, like an example that a particular variable should be assigned a value sooner quite than later. In such a scenario  the ordering of the variables can be done dynamically so in response to some information gathered about that how the search is progressing during the search procedure.


Related Discussions:- Forward checking - artificial intelligence

Control of program, Example:                         CMP    AX,BX    ;...

Example:                         CMP    AX,BX    ; compare instruction: sets flags JE        THERE    ; if equal then skip the ADD instruction  ADD  AX, 02    ; add 02

Determine the number of lines for writing into memory, Words having 8-bits ...

Words having 8-bits are to be stored into computer memory.  The number of lines required for writing into memory are ? Ans. 8-bit words needed 8 bit data lines.

Measuring and improving cache performance, Measuring and Improving Cache Pe...

Measuring and Improving Cache Performance: 1. Reduce the possibility that 2 different memory block will contend for the similar cache location 2. Additional cache levels

Same reg variable in an always block, What value is inferred when multiple ...

What value is inferred when multiple procedural assignments made to the same reg variable in an always block? When  there  are  multiple  nonblocking  assignments  made  to  th

What is a system call, What is a system call? A  system  call  is  a  r...

What is a system call? A  system  call  is  a  request  made  through  any  program  to  the  operating  system  for performing tasks, picked by a predefined set, that the said

Logic-based expert systems - , Logic-based Expert Systems - Artificial inte...

Logic-based Expert Systems - Artificial intelligence: Expert systems are agents which are programmed to make decisions about real world situations. They are put together by uti

Show SNMPs representation in ASN.1 syntax, An SNMP integer whose value is 2...

An SNMP integer whose value is 200 has to be transmitted. Show its representation in ASN.1 syntax. An ASN.1 transfer syntax describes how values of ASN.1 types are unambiguousl

Mingw32 compiler, Although there are no compulsory "c" compiler for this su...

Although there are no compulsory "c" compiler for this subject, but the compiler we are going to use for this example is the Mingw32 compiler. Download the source code files fro

What is XMS, What is XMS Memory system is divided into 3 main parts. TP...

What is XMS Memory system is divided into 3 main parts. TPA (transient program area), system area and XMS (extended memory system). Type of microprocessor in your computer sign

Drawbacks to having call centres overseas, Drawbacks to having call centres...

Drawbacks to having call centres overseas -  Culture and language problems -  Animosity to overseas call centres (resulting in loss of customers) -  need for extensive r

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd