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Catalogue of Artificial Intelligence Techniques

Catalogue of Artificial Intelligence Techniques

   

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Strict Standards: Non-static method DB::isError() should not be called statically, assuming $this from incompatible context in /usr/share/pear/DB/common.php on line 1666

Strict Standards: Non-static method DB::isError() should not be called statically, assuming $this from incompatible context in /usr/share/pear/DB.php on line 1387

Strict Standards: Non-static method DB::isError() should not be called statically, assuming $this from incompatible context in /usr/share/pear/DB/common.php on line 1683

Strict Standards: Non-static method DB::isError() should not be called statically, assuming $this from incompatible context in /group/project/aicat/web/lib/database.php on line 113

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Depth-first Parsing

Keywords: backtracking, backtracking parser, breadth-first search, parsing, pseudo-parallel parser

Categories: Natural Language


Author(s): Henry Thompson

Amounts to a Depth-first Search of the tree of alternatives which arise in the parsing process. Clearest in the context of Top-down parsing of a Context-free Grammar. Suppose our grammar includes the following rules:

Suppose that in the course of analysing a string we are trying to find an , which leads us to look for a , which we find. A choice then confronts us--do we look now for an following the , or do we rather look for a at the same place we found the ? Given the possibility of ambiguity, either or both course may succeed. The first choice, which leads to a backtracking parser, is depth-first. The second choice, which leads to a pseudo-parallel parser, is Breadth-first. If the candidate string was in fact ambiguous, in the depth-first case we would find in that order, whereas in the breadth-first case we would find .


References:


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Strict Standards: Non-static method DB::isError() should not be called statically, assuming $this from incompatible context in /usr/share/pear/DB.php on line 1387

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Strict Standards: Non-static method DB::isManip() should not be called statically, assuming $this from incompatible context in /usr/share/pear/DB/common.php on line 2200

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Strict Standards: Non-static method DB::isError() should not be called statically, assuming $this from incompatible context in /usr/share/pear/DB/common.php on line 1666

Strict Standards: Non-static method DB::isError() should not be called statically, assuming $this from incompatible context in /usr/share/pear/DB.php on line 1387

Strict Standards: Non-static method DB::isError() should not be called statically, assuming $this from incompatible context in /usr/share/pear/DB/common.php on line 1683

Strict Standards: Non-static method DB::isError() should not be called statically, assuming $this from incompatible context in /group/project/aicat/web/lib/database.php on line 113
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