Forward checking - artificial intelligence, Computer Engineering

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.

Posted Date: 1/12/2013 6:00:39 AM | Location : United States







Related Discussions:- Forward checking - artificial intelligence, Assignment Help, Ask Question on Forward checking - artificial intelligence, Get Answer, Expert's Help, Forward checking - artificial intelligence Discussions

Write discussion on Forward checking - artificial intelligence
Your posts are moderated
Related Questions
Explain difference between Scanning and parsing. Scanning and parsing: Scanning process is the process of recognizing the lexical components in a source string whereas parsin

What does the swapping system do if it identifies the illegal page for swapping? If the disk block descriptor does not have any record of the faulted page, then this causes the

Question 1: (a) How would you explain human reasoning? (b) Explain the different types of human reasoning? Question 2: (a) What are the computational factors affec

Object Orientation and Analysis An Object is anything that exists within the problem domain that can be recognized by data and/or behaviour. An example of an object is a bike.

What is the last entry in all BDC tables? In all BDC tables the last entry is to save the data by using the field name BDC_OKCODE and a field value of '/11'.

how to solve pebble merchant problem.? coding for it..!

Q. Explain functions of direct memory access? Though CPU intervention in DMA is minimised however it should use path between interfaces that is system bus. So DMA involves an e

Differentiate between linear addressing and matrix addressing modes with examples. Ans: Linear Addressing: Addressing is the procedure of selecting one of the cells in a

Explain the Resolution of an ADC. Ans. Resolution- It  is  the  smallest  possible  change  in  input  voltage  the same as  the  fraction  of percentage of the full s

Q.  Develop a Menu driven program with following menu: 1.  Octal to Decimal 2.  Octal to Hexadecimal 3.  Octal to Binary