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Add new string repair heuristic (#7496)

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* Fixed spurious counterexamples in seq-sls. Updates might not be identity mapping

* Removed debug code

* One check was missing

* Trying different update generation function

* Renamed function

* Added parameter to select string update function
This commit is contained in:
Clemens Eisenhofer 2024-12-30 17:49:07 +01:00 • committed by GitHub
parent e002c57aa2
commit 19c95f8561
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3 changed files with 64 additions and 14 deletions
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5
src/params/sls_params.pyg
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@ -3,7 +3,7 @@ def_module_params('sls',
description='Experimental Stochastic Local Search Solver (for QFBV only).',
params=(max_memory_param(),
('max_restarts', UINT, UINT_MAX, 'maximum number of restarts'),
('max_repairs', UINT, 1000, 'maximum number of repairs before restart'),
('max_repairs', UINT, 1000, 'maximum number of repairs before restart'),
('walksat', BOOL, 1, 'use walksat assertion selection (instead of gsat)'),
('walksat_ucb', BOOL, 1, 'use bandit heuristic for walksat assertion selection (instead of random)'),
('walksat_ucb_constant', DOUBLE, 20.0, 'the ucb constant c in the term score + c * f(touched)'),
@ -24,5 +24,6 @@ def_module_params('sls',
('rescore', BOOL, 1, 'rescore/normalize top-level score every base restart interval'),
('dt_axiomatic', BOOL, True, 'use axiomatic mode or model reduction for datatype solver'),
('track_unsat', BOOL, 0, 'keep a list of unsat assertions as done in SAT - currently disabled internally'),
('random_seed', UINT, 0, 'random seed')
('random_seed', UINT, 0, 'random seed'),
('str_update_strategy', UINT, 1, 'string update candidate selection: 0 - single character based update, 1 - subsequence based update')
))