By Dana Angluin (auth.), Georgios Paliouras, Yasubumi Sakakibara (eds.)
This publication constitutes the refereed court cases of the seventh overseas Colloquium on Grammatical Inference, ICGI 2004, held in Athens, Greece in October 2004.
The 20 revised complete papers and eight revised poster papers awarded including three invited contributions have been conscientiously reviewed and chosen from forty five submissions. the themes of the papers provided diversity from theoretical result of studying algorithms to cutting edge purposes of grammatical inference and from studying numerous fascinating sessions of formal grammars to estimations of probabilistic grammars.
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It is clear from these thirty problems that, when the percentage of the labeled nodes goes under 20%, S-EDSM outperforms EDSM heavily in target size convergence. S-EDSM’s heuristic seems to be paying back in terms of target size convergence. Mutually Compatible and Incompatible Merges 8 39 Conclusion and Perspectives Initial results on S-EDSM’s heuristic show that there is an improvement in both classification rate and final hypothesis size. The reason for this can be attributed to the fact that, S-EDSM augments its evidence score by combining the information of multiple valid merges.
In addition the proofs contained in  showed that for all grammars, other than those that could generate all strings of a given alphabet, the BruteForceLearner algorithm required negative data to ensure that it uniquely identified any context-free language. As described in the previous section, the only known way that could be used to construct sufficient negative data to ensure that at least one known algorithm could identify the language exactly from positive data was not computable in polynomial time.
Secondly, they prune the search tree (when a search strategy is applied) in such a way that equivalent merges are grouped together and need not be traversed individually. The strategy can also be seen as a kind of lookahead, computing an expectation of the score that you can expect in the next choices. Shared evidence driven state merging (S-EDSM), is an attempt at a heuristic that tries to minimise the risk of a merge. Undoubtedly there exist no risk 1 W-EDSM, also presented in , takes only a subset of all the possible merges.