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< a href = "zero__half__cuts_8h.html" > Go to the documentation of this file.< / a > < div class = "fragment" > < div class = "line" > < a id = "l00001" name = "l00001" > < / a > < span class = "lineno" > 1< / span > < span class = "comment" > // Copyright 2010-2021 Google LLC< / span > < / div >
< div class = "line" > < a id = "l00002" name = "l00002" > < / a > < span class = "lineno" > 2< / span > < span class = "comment" > // Licensed under the Apache License, Version 2.0 (the " License" );< / span > < / div >
< div class = "line" > < a id = "l00003" name = "l00003" > < / a > < span class = "lineno" > 3< / span > < span class = "comment" > // you may not use this file except in compliance with the License.< / span > < / div >
< div class = "line" > < a id = "l00004" name = "l00004" > < / a > < span class = "lineno" > 4< / span > < span class = "comment" > // You may obtain a copy of the License at< / span > < / div >
< div class = "line" > < a id = "l00005" name = "l00005" > < / a > < span class = "lineno" > 5< / span > < span class = "comment" > //< / span > < / div >
< div class = "line" > < a id = "l00006" name = "l00006" > < / a > < span class = "lineno" > 6< / span > < span class = "comment" > // http://www.apache.org/licenses/LICENSE-2.0< / span > < / div >
< div class = "line" > < a id = "l00007" name = "l00007" > < / a > < span class = "lineno" > 7< / span > < span class = "comment" > //< / span > < / div >
< div class = "line" > < a id = "l00008" name = "l00008" > < / a > < span class = "lineno" > 8< / span > < span class = "comment" > // Unless required by applicable law or agreed to in writing, software< / span > < / div >
< div class = "line" > < a id = "l00009" name = "l00009" > < / a > < span class = "lineno" > 9< / span > < span class = "comment" > // distributed under the License is distributed on an " AS IS" BASIS,< / span > < / div >
< div class = "line" > < a id = "l00010" name = "l00010" > < / a > < span class = "lineno" > 10< / span > < span class = "comment" > // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.< / span > < / div >
< div class = "line" > < a id = "l00011" name = "l00011" > < / a > < span class = "lineno" > 11< / span > < span class = "comment" > // See the License for the specific language governing permissions and< / span > < / div >
< div class = "line" > < a id = "l00012" name = "l00012" > < / a > < span class = "lineno" > 12< / span > < span class = "comment" > // limitations under the License.< / span > < / div >
< div class = "line" > < a id = "l00013" name = "l00013" > < / a > < span class = "lineno" > 13< / span > < / div >
< div class = "line" > < a id = "l00014" name = "l00014" > < / a > < span class = "lineno" > 14< / span > < span class = "preprocessor" > #ifndef OR_TOOLS_SAT_ZERO_HALF_CUTS_H_< / span > < / div >
< div class = "line" > < a id = "l00015" name = "l00015" > < / a > < span class = "lineno" > 15< / span > < span class = "preprocessor" > #define OR_TOOLS_SAT_ZERO_HALF_CUTS_H_< / span > < / div >
< div class = "line" > < a id = "l00016" name = "l00016" > < / a > < span class = "lineno" > 16< / span > < / div >
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< div class = "line" > < a id = "l00017" name = "l00017" > < / a > < span class = "lineno" > 17< / span > < span class = "preprocessor" > #include < functional> < / span > < / div >
< div class = "line" > < a id = "l00018" name = "l00018" > < / a > < span class = "lineno" > 18< / span > < span class = "preprocessor" > #include < utility> < / span > < / div >
< div class = "line" > < a id = "l00019" name = "l00019" > < / a > < span class = "lineno" > 19< / span > < span class = "preprocessor" > #include < vector> < / span > < / div >
< div class = "line" > < a id = "l00020" name = "l00020" > < / a > < span class = "lineno" > 20< / span > < / div >
< div class = "line" > < a id = "l00021" name = "l00021" > < / a > < span class = "lineno" > 21< / span > < span class = "preprocessor" > #include " < a class = "code" href = "lp__types_8h.html" > ortools/lp_data/lp_types.h< / a > " < / span > < / div >
< div class = "line" > < a id = "l00022" name = "l00022" > < / a > < span class = "lineno" > 22< / span > < span class = "preprocessor" > #include " < a class = "code" href = "integer_8h.html" > ortools/sat/integer.h< / a > " < / span > < / div >
< div class = "line" > < a id = "l00023" name = "l00023" > < / a > < span class = "lineno" > 23< / span > < span class = "preprocessor" > #include " < a class = "code" href = "sat_2util_8h.html" > ortools/sat/util.h< / a > " < / span > < / div >
< div class = "line" > < a id = "l00024" name = "l00024" > < / a > < span class = "lineno" > 24< / span > < / div >
< div class = "line" > < a id = "l00025" name = "l00025" > < / a > < span class = "lineno" > 25< / span > < span class = "keyword" > namespace < / span > < a class = "code hl_namespace" href = "namespaceoperations__research.html" > operations_research< / a > {< / div >
< div class = "line" > < a id = "l00026" name = "l00026" > < / a > < span class = "lineno" > 26< / span > < span class = "keyword" > namespace < / span > sat {< / div >
< div class = "line" > < a id = "l00027" name = "l00027" > < / a > < span class = "lineno" > 27< / span > < / div >
< div class = "line" > < a id = "l00028" name = "l00028" > < / a > < span class = "lineno" > 28< / span > < span class = "comment" > // Heuristic to find a good sums of rows from the LP (with coeff -1, +1) that< / span > < / div >
< div class = "line" > < a id = "l00029" name = "l00029" > < / a > < span class = "lineno" > 29< / span > < span class = "comment" > // can lead to a violated zero-half cut (i.e. after integer rounding with a< / span > < / div >
< div class = "line" > < a id = "l00030" name = "l00030" > < / a > < span class = "lineno" > 30< / span > < span class = "comment" > // divisor 2).< / span > < / div >
< div class = "line" > < a id = "l00031" name = "l00031" > < / a > < span class = "lineno" > 31< / span > < span class = "comment" > //< / span > < / div >
< div class = "line" > < a id = "l00032" name = "l00032" > < / a > < span class = "lineno" > 32< / span > < span class = "comment" > // For this, all that matter is the parity of the coefficients and the rhs in< / span > < / div >
< div class = "line" > < a id = "l00033" name = "l00033" > < / a > < span class = "lineno" > 33< / span > < span class = "comment" > // the linear combination of the original problem constraint. So this class< / span > < / div >
< div class = "line" > < a id = "l00034" name = "l00034" > < / a > < span class = "lineno" > 34< / span > < span class = "comment" > // maintain a copy of the LP matrix modulo 2 on which simplification and< / span > < / div >
< div class = "line" > < a id = "l00035" name = "l00035" > < / a > < span class = "lineno" > 35< / span > < span class = "comment" > // heuristic are performed to find good cut candidates(s).< / span > < / div >
< div class = "line" > < a id = "l00036" name = "l00036" > < / a > < span class = "lineno" > 36< / span > < span class = "comment" > //< / span > < / div >
< div class = "line" > < a id = "l00037" name = "l00037" > < / a > < span class = "lineno" > 37< / span > < span class = "comment" > // Most of what is done here is described in the paper " Algorithms to Separate< / span > < / div >
< div class = "line" > < a id = "l00038" name = "l00038" > < / a > < span class = "lineno" > 38< / span > < span class = "comment" > // {0, 1/2}-Chvátal-Gomory Cuts" , Arie M. C. A. Koster, Adrian Zymolka, Manuel< / span > < / div >
< div class = "line" > < a id = "l00039" name = "l00039" > < / a > < span class = "lineno" > 39< / span > < span class = "comment" > // Kutschka.< / span > < / div >
< div class = "line" > < a id = "l00040" name = "l00040" > < / a > < span class = "lineno" > < a class = "line" href = "classoperations__research_1_1sat_1_1_zero_half_cut_helper.html" > 40< / a > < / span > < span class = "keyword" > class < / span > < a class = "code hl_class" href = "classoperations__research_1_1sat_1_1_zero_half_cut_helper.html" > ZeroHalfCutHelper< / a > {< / div >
< div class = "line" > < a id = "l00041" name = "l00041" > < / a > < span class = "lineno" > 41< / span > < span class = "keyword" > public< / span > :< / div >
< div class = "line" > < a id = "l00042" name = "l00042" > < / a > < span class = "lineno" > 42< / span > < span class = "comment" > // Public API: ProcessVariables() must be called first and then constraints< / span > < / div >
< div class = "line" > < a id = "l00043" name = "l00043" > < / a > < span class = "lineno" > 43< / span > < span class = "comment" > // can be added one by one. Finally GetZeroHalfInterestingCuts() will return a< / span > < / div >
< div class = "line" > < a id = "l00044" name = "l00044" > < / a > < span class = "lineno" > 44< / span > < span class = "comment" > // set of good candidates.< / span > < / div >
< div class = "line" > < a id = "l00045" name = "l00045" > < / a > < span class = "lineno" > 45< / span > < span class = "comment" > //< / span > < / div >
< div class = "line" > < a id = "l00046" name = "l00046" > < / a > < span class = "lineno" > 46< / span > < span class = "comment" > // TODO(user): This is a first implementation, both the heuristic and the< / span > < / div >
< div class = "line" > < a id = "l00047" name = "l00047" > < / a > < span class = "lineno" > 47< / span > < span class = "comment" > // code performance can probably be improved uppon.< / span > < / div >
< div class = "line" > < a id = "l00048" name = "l00048" > < / a > < span class = "lineno" > 48< / span > < span class = "keywordtype" > void< / span > < a class = "code hl_function" href = "classoperations__research_1_1sat_1_1_zero_half_cut_helper.html#a329f7f126c4f5e81cae82065d7fb96d0" > ProcessVariables< / a > (< span class = "keyword" > const< / span > std::vector< double> & lp_values,< / div >
< div class = "line" > < a id = "l00049" name = "l00049" > < / a > < span class = "lineno" > 49< / span > < span class = "keyword" > const< / span > std::vector< IntegerValue> & < a class = "code hl_variable" href = "sat_2lp__utils_8cc.html#a561d7bf12fc7674b3fe0ad2ba2e175a0" > lower_bounds< / a > ,< / div >
< div class = "line" > < a id = "l00050" name = "l00050" > < / a > < span class = "lineno" > 50< / span > < span class = "keyword" > const< / span > std::vector< IntegerValue> & < a class = "code hl_variable" href = "sat_2lp__utils_8cc.html#a88215c8581662c40eec0fb8621c44af3" > upper_bounds< / a > );< / div >
< div class = "line" > < a id = "l00051" name = "l00051" > < / a > < span class = "lineno" > 51< / span > < span class = "keywordtype" > void< / span > < a class = "code hl_function" href = "classoperations__research_1_1sat_1_1_zero_half_cut_helper.html#a5ee01a4c637125095a16a5c23bd227a3" > AddOneConstraint< / a > (< / div >
< div class = "line" > < a id = "l00052" name = "l00052" > < / a > < span class = "lineno" > 52< / span > glop::RowIndex,< / div >
< div class = "line" > < a id = "l00053" name = "l00053" > < / a > < span class = "lineno" > 53< / span > < span class = "keyword" > const< / span > std::vector< std::pair< glop::ColIndex, IntegerValue> > & terms,< / div >
< div class = "line" > < a id = "l00054" name = "l00054" > < / a > < span class = "lineno" > 54< / span > IntegerValue lb, IntegerValue ub);< / div >
< div class = "line" > < a id = "l00055" name = "l00055" > < / a > < span class = "lineno" > 55< / span > std::vector< std::vector< std::pair< glop::RowIndex, IntegerValue> > > < / div >
< div class = "line" > < a id = "l00056" name = "l00056" > < / a > < span class = "lineno" > 56< / span > < a class = "code hl_function" href = "classoperations__research_1_1sat_1_1_zero_half_cut_helper.html#af7012dee6abfab160a910241b61e1b1d" > InterestingCandidates< / a > (< a class = "code hl_class" href = "classoperations__research_1_1sat_1_1_model_random_generator.html" > ModelRandomGenerator< / a > * random);< / div >
< div class = "line" > < a id = "l00057" name = "l00057" > < / a > < span class = "lineno" > 57< / span > < / div >
< div class = "line" > < a id = "l00058" name = "l00058" > < / a > < span class = "lineno" > 58< / span > < span class = "comment" > // Visible for testing.< / span > < / div >
< div class = "line" > < a id = "l00059" name = "l00059" > < / a > < span class = "lineno" > 59< / span > < span class = "keywordtype" > void< / span > < a class = "code hl_function" href = "classoperations__research_1_1sat_1_1_zero_half_cut_helper.html#a2f1661e59c567817452d568cfd59e136" > Reset< / a > (< span class = "keywordtype" > int< / span > size);< / div >
< div class = "line" > < a id = "l00060" name = "l00060" > < / a > < span class = "lineno" > 60< / span > < / div >
< div class = "line" > < a id = "l00061" name = "l00061" > < / a > < span class = "lineno" > 61< / span > < span class = "comment" > // Visible for testing.< / span > < / div >
< div class = "line" > < a id = "l00062" name = "l00062" > < / a > < span class = "lineno" > 62< / span > < span class = "comment" > //< / span > < / div >
< div class = "line" > < a id = "l00063" name = "l00063" > < / a > < span class = "lineno" > 63< / span > < span class = "comment" > // Boolean matrix. Each column correspond to one variable (col indices).< / span > < / div >
< div class = "line" > < a id = "l00064" name = "l00064" > < / a > < span class = "lineno" > 64< / span > < span class = "comment" > // Each row to a sum of the initial problem constraints. We store the< / span > < / div >
< div class = "line" > < a id = "l00065" name = "l00065" > < / a > < span class = "lineno" > 65< / span > < span class = "comment" > // coefficient modulo 2, so only the positions of the ones.< / span > < / div >
< div class = "line" > < a id = "l00066" name = "l00066" > < / a > < span class = "lineno" > < a class = "line" href = "structoperations__research_1_1sat_1_1_zero_half_cut_helper_1_1_combination_of_rows.html" > 66< / a > < / span > < span class = "keyword" > struct < / span > < a class = "code hl_struct" href = "structoperations__research_1_1sat_1_1_zero_half_cut_helper_1_1_combination_of_rows.html" > CombinationOfRows< / a > {< / div >
< div class = "line" > < a id = "l00067" name = "l00067" > < / a > < span class = "lineno" > 67< / span > < span class = "comment" > // How this row was formed from the initial problem constraints.< / span > < / div >
< div class = "line" > < a id = "l00068" name = "l00068" > < / a > < span class = "lineno" > < a class = "line" href = "structoperations__research_1_1sat_1_1_zero_half_cut_helper_1_1_combination_of_rows.html#a369301d86d45f16328f26624cdfcfcba" > 68< / a > < / span > std::vector< std::pair< glop::RowIndex, IntegerValue> > < a class = "code hl_variable" href = "structoperations__research_1_1sat_1_1_zero_half_cut_helper_1_1_combination_of_rows.html#a369301d86d45f16328f26624cdfcfcba" > multipliers< / a > ;< / div >
< div class = "line" > < a id = "l00069" name = "l00069" > < / a > < span class = "lineno" > 69< / span > < / div >
< div class = "line" > < a id = "l00070" name = "l00070" > < / a > < span class = "lineno" > 70< / span > < span class = "comment" > // The index of the odd coefficient of this combination.< / span > < / div >
< div class = "line" > < a id = "l00071" name = "l00071" > < / a > < span class = "lineno" > < a class = "line" href = "structoperations__research_1_1sat_1_1_zero_half_cut_helper_1_1_combination_of_rows.html#a6bf955ff7eba178a0dd6b9b2b8aaea33" > 71< / a > < / span > std::vector< int> < a class = "code hl_variable" href = "structoperations__research_1_1sat_1_1_zero_half_cut_helper_1_1_combination_of_rows.html#a6bf955ff7eba178a0dd6b9b2b8aaea33" > cols< / a > ;< / div >
< div class = "line" > < a id = "l00072" name = "l00072" > < / a > < span class = "lineno" > 72< / span > < / div >
< div class = "line" > < a id = "l00073" name = "l00073" > < / a > < span class = "lineno" > 73< / span > < span class = "comment" > // The parity of the rhs (1 for odd).< / span > < / div >
< div class = "line" > < a id = "l00074" name = "l00074" > < / a > < span class = "lineno" > < a class = "line" href = "structoperations__research_1_1sat_1_1_zero_half_cut_helper_1_1_combination_of_rows.html#ad672b27c7276e0a1588afb57c18afa11" > 74< / a > < / span > < span class = "keywordtype" > int< / span > < a class = "code hl_variable" href = "structoperations__research_1_1sat_1_1_zero_half_cut_helper_1_1_combination_of_rows.html#ad672b27c7276e0a1588afb57c18afa11" > rhs_parity< / a > ;< / div >
< div class = "line" > < a id = "l00075" name = "l00075" > < / a > < span class = "lineno" > 75< / span > < / div >
< div class = "line" > < a id = "l00076" name = "l00076" > < / a > < span class = "lineno" > 76< / span > < span class = "comment" > // How tight this constraints is under the current LP solution.< / span > < / div >
< div class = "line" > < a id = "l00077" name = "l00077" > < / a > < span class = "lineno" > < a class = "line" href = "structoperations__research_1_1sat_1_1_zero_half_cut_helper_1_1_combination_of_rows.html#a62a9f2c91b6d4f5f872718e2dfecd061" > 77< / a > < / span > < span class = "keywordtype" > double< / span > < a class = "code hl_variable" href = "structoperations__research_1_1sat_1_1_zero_half_cut_helper_1_1_combination_of_rows.html#a62a9f2c91b6d4f5f872718e2dfecd061" > slack< / a > ;< / div >
< div class = "line" > < a id = "l00078" name = "l00078" > < / a > < span class = "lineno" > 78< / span > };< / div >
< div class = "line" > < a id = "l00079" name = "l00079" > < / a > < span class = "lineno" > 79< / span > < span class = "keywordtype" > void< / span > < a class = "code hl_function" href = "classoperations__research_1_1sat_1_1_zero_half_cut_helper.html#a0cd2af6dbc5da51cd7cdd3b4219b66e7" > AddBinaryRow< / a > (< span class = "keyword" > const< / span > < a class = "code hl_struct" href = "structoperations__research_1_1sat_1_1_zero_half_cut_helper_1_1_combination_of_rows.html" > CombinationOfRows< / a > & binary_row);< / div >
< div class = "line" > < a id = "l00080" name = "l00080" > < / a > < span class = "lineno" > < a class = "line" href = "classoperations__research_1_1sat_1_1_zero_half_cut_helper.html#a1c7b29357b360a88b69d2f76b6fbbc1c" > 80< / a > < / span > < span class = "keyword" > const< / span > < a class = "code hl_struct" href = "structoperations__research_1_1sat_1_1_zero_half_cut_helper_1_1_combination_of_rows.html" > CombinationOfRows< / a > & < a class = "code hl_function" href = "classoperations__research_1_1sat_1_1_zero_half_cut_helper.html#a1c7b29357b360a88b69d2f76b6fbbc1c" > MatrixRow< / a > (< span class = "keywordtype" > int< / span > < a class = "code hl_variable" href = "markowitz_8cc.html#aea35f36ba98d5bbd8d033382f50c9e52" > row< / a > )< span class = "keyword" > const < / span > { < span class = "keywordflow" > return< / span > rows_[< a class = "code hl_variable" href = "markowitz_8cc.html#aea35f36ba98d5bbd8d033382f50c9e52" > row< / a > ]; }< / div >
< div class = "line" > < a id = "l00081" name = "l00081" > < / a > < span class = "lineno" > < a class = "line" href = "classoperations__research_1_1sat_1_1_zero_half_cut_helper.html#a72f827241202355600807967c2ccb70f" > 81< / a > < / span > < span class = "keyword" > const< / span > std::vector< int> & < a class = "code hl_function" href = "classoperations__research_1_1sat_1_1_zero_half_cut_helper.html#a72f827241202355600807967c2ccb70f" > MatrixCol< / a > (< span class = "keywordtype" > int< / span > < a class = "code hl_variable" href = "markowitz_8cc.html#aa9d6c98fdf8d89b0e2321fda02adc82c" > col< / a > )< span class = "keyword" > const < / span > { < span class = "keywordflow" > return< / span > col_to_rows_[< a class = "code hl_variable" href = "markowitz_8cc.html#aa9d6c98fdf8d89b0e2321fda02adc82c" > col< / a > ]; }< / div >
< div class = "line" > < a id = "l00082" name = "l00082" > < / a > < span class = "lineno" > 82< / span > < / div >
< div class = "line" > < a id = "l00083" name = "l00083" > < / a > < span class = "lineno" > 83< / span > < span class = "comment" > // Visible for testing.< / span > < / div >
< div class = "line" > < a id = "l00084" name = "l00084" > < / a > < span class = "lineno" > 84< / span > < span class = "comment" > //< / span > < / div >
< div class = "line" > < a id = "l00085" name = "l00085" > < / a > < span class = "lineno" > 85< / span > < span class = "comment" > // Adds the given row to all other rows having an odd cofficient on the given< / span > < / div >
< div class = "line" > < a id = "l00086" name = "l00086" > < / a > < span class = "lineno" > 86< / span > < span class = "comment" > // column. This then eliminate the entry (col, row) that is now a singleton by< / span > < / div >
< div class = "line" > < a id = "l00087" name = "l00087" > < / a > < span class = "lineno" > 87< / span > < span class = "comment" > // incresing the slack of the given row.< / span > < / div >
< div class = "line" > < a id = "l00088" name = "l00088" > < / a > < span class = "lineno" > 88< / span > < span class = "keywordtype" > void< / span > < a class = "code hl_function" href = "classoperations__research_1_1sat_1_1_zero_half_cut_helper.html#a0878d4f013921f646b839964ad02919b" > EliminateVarUsingRow< / a > (< span class = "keywordtype" > int< / span > < a class = "code hl_variable" href = "markowitz_8cc.html#aa9d6c98fdf8d89b0e2321fda02adc82c" > col< / a > , < span class = "keywordtype" > int< / span > < a class = "code hl_variable" href = "markowitz_8cc.html#aea35f36ba98d5bbd8d033382f50c9e52" > row< / a > );< / div >
< div class = "line" > < a id = "l00089" name = "l00089" > < / a > < span class = "lineno" > 89< / span > < / div >
< div class = "line" > < a id = "l00090" name = "l00090" > < / a > < span class = "lineno" > 90< / span > < span class = "comment" > // Visible for testing.< / span > < / div >
< div class = "line" > < a id = "l00091" name = "l00091" > < / a > < span class = "lineno" > 91< / span > < span class = "comment" > //< / span > < / div >
< div class = "line" > < a id = "l00092" name = "l00092" > < / a > < span class = "lineno" > 92< / span > < span class = "comment" > // Like std::set_symmetric_difference, but use a vector< bool> instead of sort.< / span > < / div >
< div class = "line" > < a id = "l00093" name = "l00093" > < / a > < span class = "lineno" > 93< / span > < span class = "comment" > // This assumes tmp_marked_ to be all false. We don' t DCHECK it here for< / span > < / div >
< div class = "line" > < a id = "l00094" name = "l00094" > < / a > < span class = "lineno" > 94< / span > < span class = "comment" > // speed, but it DCHECKed on each EliminateVarUsingRow() call. In addition,< / span > < / div >
< div class = "line" > < a id = "l00095" name = "l00095" > < / a > < span class = "lineno" > 95< / span > < span class = "comment" > // the result is filtered using the extra_condition function.< / span > < / div >
< div class = "line" > < a id = "l00096" name = "l00096" > < / a > < span class = "lineno" > 96< / span > < span class = "keywordtype" > void< / span > < a class = "code hl_function" href = "classoperations__research_1_1sat_1_1_zero_half_cut_helper.html#a1cebbddb8d43bec60cbbae102bd6a6e5" > SymmetricDifference< / a > (std::function< < span class = "keywordtype" > bool< / span > (< span class = "keywordtype" > int< / span > )> extra_condition,< / div >
< div class = "line" > < a id = "l00097" name = "l00097" > < / a > < span class = "lineno" > 97< / span > < span class = "keyword" > const< / span > std::vector< int> & < a class = "code hl_variable" href = "constraint__solver_2table_8cc.html#acb18315d548212835cd8ed4287e6c0b6" > a< / a > , std::vector< int> * < a class = "code hl_variable" href = "constraint__solver_2table_8cc.html#a9293e4d29cac928301645070dd307683" > b< / a > );< / div >
< div class = "line" > < a id = "l00098" name = "l00098" > < / a > < span class = "lineno" > 98< / span > < / div >
< div class = "line" > < a id = "l00099" name = "l00099" > < / a > < span class = "lineno" > 99< / span > < span class = "keyword" > private< / span > :< / div >
< div class = "line" > < a id = "l00100" name = "l00100" > < / a > < span class = "lineno" > 100< / span > < span class = "keywordtype" > void< / span > ProcessSingletonColumns();< / div >
< div class = "line" > < a id = "l00101" name = "l00101" > < / a > < span class = "lineno" > 101< / span > < / div >
< div class = "line" > < a id = "l00102" name = "l00102" > < / a > < span class = "lineno" > 102< / span > < span class = "comment" > // As we combine rows, when the activity of a combination get too far away< / span > < / div >
< div class = "line" > < a id = "l00103" name = "l00103" > < / a > < span class = "lineno" > 103< / span > < span class = "comment" > // from its bound, we just discard it. Note that the row will still be there< / span > < / div >
< div class = "line" > < a id = "l00104" name = "l00104" > < / a > < span class = "lineno" > 104< / span > < span class = "comment" > // but its index will not appear in the col-wise representation of the matrix.< / span > < / div >
< div class = "line" > < a id = "l00105" name = "l00105" > < / a > < span class = "lineno" > 105< / span > < span class = "keyword" > const< / span > < span class = "keywordtype" > double< / span > kSlackThreshold = 0.5;< / div >
< div class = "line" > < a id = "l00106" name = "l00106" > < / a > < span class = "lineno" > 106< / span > < span class = "keyword" > const< / span > < span class = "keywordtype" > int< / span > kMaxAggregationSize = 100;< / div >
< div class = "line" > < a id = "l00107" name = "l00107" > < / a > < span class = "lineno" > 107< / span > < / div >
< div class = "line" > < a id = "l00108" name = "l00108" > < / a > < span class = "lineno" > 108< / span > < span class = "comment" > // We don' t consider long constraint or constraint with high magnitude, since< / span > < / div >
< div class = "line" > < a id = "l00109" name = "l00109" > < / a > < span class = "lineno" > 109< / span > < span class = "comment" > // the highest violation we can hope for is 1, and if the magnitude is large< / span > < / div >
< div class = "line" > < a id = "l00110" name = "l00110" > < / a > < span class = "lineno" > 110< / span > < span class = "comment" > // then the cut efficacity will not be great.< / span > < / div >
< div class = "line" > < a id = "l00111" name = "l00111" > < / a > < span class = "lineno" > 111< / span > < span class = "keyword" > const< / span > < span class = "keywordtype" > int< / span > kMaxInputConstraintSize = 100;< / div >
< div class = "line" > < a id = "l00112" name = "l00112" > < / a > < span class = "lineno" > 112< / span > < span class = "keyword" > const< / span > < span class = "keywordtype" > double< / span > kMaxInputConstraintMagnitude = 1e6;< / div >
< div class = "line" > < a id = "l00113" name = "l00113" > < / a > < span class = "lineno" > 113< / span > < / div >
< div class = "line" > < a id = "l00114" name = "l00114" > < / a > < span class = "lineno" > 114< / span > < span class = "comment" > // Variable information.< / span > < / div >
< div class = "line" > < a id = "l00115" name = "l00115" > < / a > < span class = "lineno" > 115< / span > std::vector< double> lp_values_;< / div >
< div class = "line" > < a id = "l00116" name = "l00116" > < / a > < span class = "lineno" > 116< / span > std::vector< double> shifted_lp_values_;< / div >
< div class = "line" > < a id = "l00117" name = "l00117" > < / a > < span class = "lineno" > 117< / span > std::vector< int> bound_parity_;< / div >
< div class = "line" > < a id = "l00118" name = "l00118" > < / a > < span class = "lineno" > 118< / span > < / div >
< div class = "line" > < a id = "l00119" name = "l00119" > < / a > < span class = "lineno" > 119< / span > < span class = "comment" > // Binary matrix.< / span > < / div >
< div class = "line" > < a id = "l00120" name = "l00120" > < / a > < span class = "lineno" > 120< / span > < span class = "comment" > //< / span > < / div >
< div class = "line" > < a id = "l00121" name = "l00121" > < / a > < span class = "lineno" > 121< / span > < span class = "comment" > // Note that as we combine rows, we never move their indices. So after initial< / span > < / div >
< div class = "line" > < a id = "l00122" name = "l00122" > < / a > < span class = "lineno" > 122< / span > < span class = "comment" > // creation rows_ will always have the same size.< / span > < / div >
< div class = "line" > < a id = "l00123" name = "l00123" > < / a > < span class = "lineno" > 123< / span > std::vector< CombinationOfRows> rows_;< / div >
< div class = "line" > < a id = "l00124" name = "l00124" > < / a > < span class = "lineno" > 124< / span > std::vector< std::vector< int> > col_to_rows_;< / div >
< div class = "line" > < a id = "l00125" name = "l00125" > < / a > < span class = "lineno" > 125< / span > std::vector< int> singleton_cols_;< / div >
< div class = "line" > < a id = "l00126" name = "l00126" > < / a > < span class = "lineno" > 126< / span > < / div >
< div class = "line" > < a id = "l00127" name = "l00127" > < / a > < span class = "lineno" > 127< / span > < span class = "comment" > // Temporary vector used by SymmetricDifference().< / span > < / div >
< div class = "line" > < a id = "l00128" name = "l00128" > < / a > < span class = "lineno" > 128< / span > std::vector< bool> tmp_marked_;< / div >
< div class = "line" > < a id = "l00129" name = "l00129" > < / a > < span class = "lineno" > 129< / span > };< / div >
< div class = "line" > < a id = "l00130" name = "l00130" > < / a > < span class = "lineno" > 130< / span > < / div >
< div class = "line" > < a id = "l00131" name = "l00131" > < / a > < span class = "lineno" > 131< / span > } < span class = "comment" > // namespace sat< / span > < / div >
< div class = "line" > < a id = "l00132" name = "l00132" > < / a > < span class = "lineno" > 132< / span > } < span class = "comment" > // namespace operations_research< / span > < / div >
< div class = "line" > < a id = "l00133" name = "l00133" > < / a > < span class = "lineno" > 133< / span > < / div >
< div class = "line" > < a id = "l00134" name = "l00134" > < / a > < span class = "lineno" > 134< / span > < span class = "preprocessor" > #endif < / span > < span class = "comment" > // OR_TOOLS_SAT_ZERO_HALF_CUTS_H_< / span > < / div >
< div class = "ttc" id = "aclassoperations__research_1_1sat_1_1_model_random_generator_html" > < div class = "ttname" > < a href = "classoperations__research_1_1sat_1_1_model_random_generator.html" > operations_research::sat::ModelRandomGenerator< / a > < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "sat_2util_8h_source.html#l00115" > sat/util.h:115< / a > < / div > < / div >
< div class = "ttc" id = "aclassoperations__research_1_1sat_1_1_zero_half_cut_helper_html" > < div class = "ttname" > < a href = "classoperations__research_1_1sat_1_1_zero_half_cut_helper.html" > operations_research::sat::ZeroHalfCutHelper< / a > < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "zero__half__cuts_8h_source.html#l00040" > zero_half_cuts.h:40< / a > < / div > < / div >
< div class = "ttc" id = "aclassoperations__research_1_1sat_1_1_zero_half_cut_helper_html_a0878d4f013921f646b839964ad02919b" > < div class = "ttname" > < a href = "classoperations__research_1_1sat_1_1_zero_half_cut_helper.html#a0878d4f013921f646b839964ad02919b" > operations_research::sat::ZeroHalfCutHelper::EliminateVarUsingRow< / a > < / div > < div class = "ttdeci" > void EliminateVarUsingRow(int col, int row)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "zero__half__cuts_8cc_source.html#l00170" > zero_half_cuts.cc:170< / a > < / div > < / div >
< div class = "ttc" id = "aclassoperations__research_1_1sat_1_1_zero_half_cut_helper_html_a0cd2af6dbc5da51cd7cdd3b4219b66e7" > < div class = "ttname" > < a href = "classoperations__research_1_1sat_1_1_zero_half_cut_helper.html#a0cd2af6dbc5da51cd7cdd3b4219b66e7" > operations_research::sat::ZeroHalfCutHelper::AddBinaryRow< / a > < / div > < div class = "ttdeci" > void AddBinaryRow(const CombinationOfRows & binary_row)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "zero__half__cuts_8cc_source.html#l00060" > zero_half_cuts.cc:60< / a > < / div > < / div >
< div class = "ttc" id = "aclassoperations__research_1_1sat_1_1_zero_half_cut_helper_html_a1c7b29357b360a88b69d2f76b6fbbc1c" > < div class = "ttname" > < a href = "classoperations__research_1_1sat_1_1_zero_half_cut_helper.html#a1c7b29357b360a88b69d2f76b6fbbc1c" > operations_research::sat::ZeroHalfCutHelper::MatrixRow< / a > < / div > < div class = "ttdeci" > const CombinationOfRows & MatrixRow(int row) const< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "zero__half__cuts_8h_source.html#l00080" > zero_half_cuts.h:80< / a > < / div > < / div >
< div class = "ttc" id = "aclassoperations__research_1_1sat_1_1_zero_half_cut_helper_html_a1cebbddb8d43bec60cbbae102bd6a6e5" > < div class = "ttname" > < a href = "classoperations__research_1_1sat_1_1_zero_half_cut_helper.html#a1cebbddb8d43bec60cbbae102bd6a6e5" > operations_research::sat::ZeroHalfCutHelper::SymmetricDifference< / a > < / div > < div class = "ttdeci" > void SymmetricDifference(std::function< bool(int)> extra_condition, const std::vector< int > & a, std::vector< int > *b)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "zero__half__cuts_8cc_source.html#l00122" > zero_half_cuts.cc:122< / a > < / div > < / div >
< div class = "ttc" id = "aclassoperations__research_1_1sat_1_1_zero_half_cut_helper_html_a2f1661e59c567817452d568cfd59e136" > < div class = "ttname" > < a href = "classoperations__research_1_1sat_1_1_zero_half_cut_helper.html#a2f1661e59c567817452d568cfd59e136" > operations_research::sat::ZeroHalfCutHelper::Reset< / a > < / div > < div class = "ttdeci" > void Reset(int size)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "zero__half__cuts_8cc_source.html#l00030" > zero_half_cuts.cc:30< / a > < / div > < / div >
< div class = "ttc" id = "aclassoperations__research_1_1sat_1_1_zero_half_cut_helper_html_a329f7f126c4f5e81cae82065d7fb96d0" > < div class = "ttname" > < a href = "classoperations__research_1_1sat_1_1_zero_half_cut_helper.html#a329f7f126c4f5e81cae82065d7fb96d0" > operations_research::sat::ZeroHalfCutHelper::ProcessVariables< / a > < / div > < div class = "ttdeci" > void ProcessVariables(const std::vector< double > & lp_values, const std::vector< IntegerValue > & lower_bounds, const std::vector< IntegerValue > & upper_bounds)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "zero__half__cuts_8cc_source.html#l00039" > zero_half_cuts.cc:39< / a > < / div > < / div >
< div class = "ttc" id = "aclassoperations__research_1_1sat_1_1_zero_half_cut_helper_html_a5ee01a4c637125095a16a5c23bd227a3" > < div class = "ttname" > < a href = "classoperations__research_1_1sat_1_1_zero_half_cut_helper.html#a5ee01a4c637125095a16a5c23bd227a3" > operations_research::sat::ZeroHalfCutHelper::AddOneConstraint< / a > < / div > < div class = "ttdeci" > void AddOneConstraint(glop::RowIndex, const std::vector< std::pair< glop::ColIndex, IntegerValue > > & terms, IntegerValue lb, IntegerValue ub)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "zero__half__cuts_8cc_source.html#l00069" > zero_half_cuts.cc:69< / a > < / div > < / div >
< div class = "ttc" id = "aclassoperations__research_1_1sat_1_1_zero_half_cut_helper_html_a72f827241202355600807967c2ccb70f" > < div class = "ttname" > < a href = "classoperations__research_1_1sat_1_1_zero_half_cut_helper.html#a72f827241202355600807967c2ccb70f" > operations_research::sat::ZeroHalfCutHelper::MatrixCol< / a > < / div > < div class = "ttdeci" > const std::vector< int > & MatrixCol(int col) const< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "zero__half__cuts_8h_source.html#l00081" > zero_half_cuts.h:81< / a > < / div > < / div >
< div class = "ttc" id = "aclassoperations__research_1_1sat_1_1_zero_half_cut_helper_html_af7012dee6abfab160a910241b61e1b1d" > < div class = "ttname" > < a href = "classoperations__research_1_1sat_1_1_zero_half_cut_helper.html#af7012dee6abfab160a910241b61e1b1d" > operations_research::sat::ZeroHalfCutHelper::InterestingCandidates< / a > < / div > < div class = "ttdeci" > std::vector< std::vector< std::pair< glop::RowIndex, IntegerValue > > > InterestingCandidates(ModelRandomGenerator *random)< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "zero__half__cuts_8cc_source.html#l00238" > zero_half_cuts.cc:238< / a > < / div > < / div >
2022-01-17 21:42:14 +01:00
< div class = "ttc" id = "aconstraint__solver_2table_8cc_html_a9293e4d29cac928301645070dd307683" > < div class = "ttname" > < a href = "constraint__solver_2table_8cc.html#a9293e4d29cac928301645070dd307683" > b< / a > < / div > < div class = "ttdeci" > int64_t b< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "constraint__solver_2table_8cc_source.html#l00047" > constraint_solver/table.cc:47< / a > < / div > < / div >
< div class = "ttc" id = "aconstraint__solver_2table_8cc_html_acb18315d548212835cd8ed4287e6c0b6" > < div class = "ttname" > < a href = "constraint__solver_2table_8cc.html#acb18315d548212835cd8ed4287e6c0b6" > a< / a > < / div > < div class = "ttdeci" > int64_t a< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "constraint__solver_2table_8cc_source.html#l00046" > constraint_solver/table.cc:46< / a > < / div > < / div >
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2022-03-04 00:11:33 +01:00
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2022-01-17 21:42:14 +01:00
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< div class = "ttc" id = "astructoperations__research_1_1sat_1_1_zero_half_cut_helper_1_1_combination_of_rows_html" > < div class = "ttname" > < a href = "structoperations__research_1_1sat_1_1_zero_half_cut_helper_1_1_combination_of_rows.html" > operations_research::sat::ZeroHalfCutHelper::CombinationOfRows< / a > < / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "zero__half__cuts_8h_source.html#l00066" > zero_half_cuts.h:66< / a > < / div > < / div >
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< div class = "ttc" id = "astructoperations__research_1_1sat_1_1_zero_half_cut_helper_1_1_combination_of_rows_html_a62a9f2c91b6d4f5f872718e2dfecd061" > < div class = "ttname" > < a href = "structoperations__research_1_1sat_1_1_zero_half_cut_helper_1_1_combination_of_rows.html#a62a9f2c91b6d4f5f872718e2dfecd061" > operations_research::sat::ZeroHalfCutHelper::CombinationOfRows::slack< / a > < / div > < div class = "ttdeci" > double slack< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "zero__half__cuts_8h_source.html#l00077" > zero_half_cuts.h:77< / a > < / div > < / div >
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2021-01-26 11:28:50 +01:00
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