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Artelys Kalis - New features
Release 2008 of Xpress-Kalis
The release Xpress-Kalis 2008 experienced a significant step
forward with the development of new features for extension.
Extensions
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tailored constraints,
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tailored specific search heuristics,
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tailored heuristics for selection of variables,
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tailored solving strategies.
An original and innovative breakthrough
One can now enrich Xpress-Kalis
oneself by creating new constraints and heuristics. This tailored
library is integrated into the default library in a transparent
manner and becomes directly available in the Mosel
language: the specific constraints are used in the same way
as the standard constraints.
This expansion function is particularly interesting for the
development of advanced models that require the use of complex
patterns of constraints propagation. Rather than limiting
the user to an array of standard modelling possibilities,
Xpress-Kalis
allows to design and implement one's own constraints and heuristics
in order to take into account the specificity of the problem
and improve the solving performance.
Release 2007.2 of Xpress-Kalis
The following improvements have been made in Xpress-Kalis
concerning:
Scheduling functionalities:
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The user has now access to optional resource consumption /
requirement / production / provision, which is very useful
when the allocations of resources to the tasks are variables
of the problem.
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A finer tuning of constraints propagation is now allowed thanks
to new parameters in set_resource_attributes.
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Search limits can now be better specified in the cp_schedule
search process (NODES, BACKTRACKS, SOLUTIONS, TIME, MAX_NODES_BETWEEN_SOLUTIONS).
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The new method cp_set_schedule_search_strategy allows to specify
search strategy for both heuristic solution pass and bound
improving/optimal solution pass.
More generally:
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Performances have been improved for variable selector, reducing
the solving time on problems with a large number of variables.
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A new control parameter, "max_nodes_between_solutions", has
been added, putting a limit on the number of nodes explored
since the last solution without finding a new solution.
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The new control parameter "verbose_level" allows the user
to control the details given in the log.
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Callbacks functions can now be resetted (ex: set_node_callback("")).
Contact
For more information about Artelys Kalis, please contact us
at:
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Tel: +33 1 44 77 89 00
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E-mail: info-kalis@artelys.com
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