krypy.recycling.factories - deflation vector factories¶
- class krypy.recycling.factories.RitzFactory(subset_evaluator, subsets_generator=None, mode='ritz', print_results=None)¶
Bases: krypy.recycling.factories._DeflationVectorFactory
Factory of Ritz vectors for automatic recycling.
Parameters: - subset_evaluator – an instance of _RitzSubsetEvaluator that evaluates a proposed subset of Ritz vectors for deflation.
- subsets_generator – (optional) an instance of _RitzSubsetsGenerator that generates lists of subsets of Ritz vectors for deflation.
- print_results –
(optional) may be one of the following:
- None: nothing is printed.
- ‘number’: the number of selected deflation vectors is printed.
- ‘values’: the Ritz values corresponding to the selected Ritz vectors are printed.
- ‘timings’: the timings of all evaluated subsets of Ritz vectors are printed.
- get(deflated_solver)¶
- class krypy.recycling.factories.RitzFactorySimple(mode='ritz', n_vectors=0, which='sm')¶
Bases: krypy.recycling.factories._DeflationVectorFactory
Selects a fixed number of Ritz or harmonic Ritz vectors with respect to a prescribed criterion.
Parameters: - mode – See mode parameter of Ritz.
- n_vectors – number of vectors that are chosen. Actual number of deflation vectors may be lower if the number of Ritz pairs is less than n_vectors.
- which –
the n_vectors Ritz vectors are chosen such that the corresponding Ritz values are the ones with
- lm: largest magnitude.
- sm: smallest magnitude.
- lr: largest real part.
- sr: smallest real part.
- li: largest imaginary part.
- si: smallest imaginary part.
- smallest_res: smallest Ritz residual norms.
- get(solver)¶
- class krypy.recycling.factories.UnionFactory(factories)¶
Bases: krypy.recycling.factories._DeflationVectorFactory
Combine a list of factories.
Parameters: factories – a list of factories derived from _DeflationVectorFactory. - get(solver)¶