Download Artificial Intelligence - Strategies Applications and Models by Christopher Thornton, Benedict du Boulay PDF

By Christopher Thornton, Benedict du Boulay

ISBN-10: 0814404707

ISBN-13: 9780814404706

Man made INTELLIGENCE suggestions, purposes, and types via seek moment version This cutting edge new e-book on man made intelligence (AI) makes use of the unifying thread of seek to compile the foremost software and modeling options that use symbolic AI. all the 11 chapters is split into 3 sections: ** a piece which introduces the strategy ** a piece which develops a low-level (POP-11) implementation ** a piece which develops a high-level (Prolog) implementation finished but useful, this ebook may be of serious price to these skilled in AI, in addition to to scholars with a few programming historical past and lecturers and execs searching for an actual dialogue of man-made intelligence via seek.

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Successor] do successor endforeach)] -> result enddefine; Figure 2-2 Computing successors Page 19 successors1 ("station") ==> ** [seven_dials clocktower] Note that below we will refer to the list of elements returned by the successors1 function for a given input L as the successors of L. In most cases, following normal practice, the successors function will just be called the successor function. Setting up the Path-Finding Function Now that we have set up a database and a function which lets us find out where we can get to from any given location we can concentrate on writing the code which will actually try out different paths.

A version search_tree which omits duplicates would check to see whether a particular location had ever been visited before. To implement this we require a variable, global with respect to the search, which accumulates a list of all locations visited. A version of the search program which does this is given in Figure 2-10. This program makes use of a simplified version of the previous definition of search_tree named simple_search_tree, which works with locations rather than paths and does all its checking for duplicates against the variable visited There is no need to store paths and check for cycles in them since the global check covers this.

Search_tree(Partial_path, Tree) :last(Partial_path, Last_state), successors(Partial_path, Extended_paths), collect_subtrees(Extended_paths, Subtrees), Tree = [Lat_state | Subtrees]). collect_subtrees([],[]). collect_subtrees([Extended_path | Extended_paths], [Subtree | Subtrees]) :search_tree(Extended_path, Subtree), collect_subtrees(Extended_paths, Subtrees). Figure 1-2 State-space search building the search tree, an OR tree Page 10 Note that this particular function and predicate are not intended to be directly runnable, as we are not offering definitions of the subsidiary functions at this early stage of the book, so the code is really a kind of schema that will be fleshed out later.

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