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make code robust in one of CLP/CBC/GLPK is not used with or-tools

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This commit is contained in:
lperron@google.com
2011-11-03 14:58:42 +00:00
parent 84db2d1eaf
commit d53c5f5faf
2 changed files with 41 additions and 31 deletions
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44
python/integer_programming.py
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@@ -21,9 +21,9 @@ from google.apputils import app
from linear_solver import pywraplp
def RunIntegerExampleNaturalLanguageAPI(optimization_problem_type):
def RunIntegerExampleAlgebraicAPI(optimization_problem_type):
"""Example of simple integer program with natural language API."""
solver = pywraplp.Solver('RunIntegerExampleNaturalLanguageAPI',
solver = pywraplp.Solver('RunIntegerExampleAlgebraicAPI',
optimization_problem_type)
infinity = solver.infinity()
# x1 and x2 are integer non-negative variables.
@@ -80,29 +80,35 @@ def SolveAndPrint(solver, variable_list):
print 'Problem solved in %d branch-and-bound nodes' % solver.nodes()
def RunAllIntegerExampleNaturalLanguageAPI():
print '---- Integer programming example with GLPK (natural language API) ----'
RunIntegerExampleNaturalLanguageAPI(
pywraplp.Solver.GLPK_MIXED_INTEGER_PROGRAMMING)
print '---- Integer programming example with CBC (natural language API) ----'
RunIntegerExampleNaturalLanguageAPI(
pywraplp.Solver.CBC_MIXED_INTEGER_PROGRAMMING)
print '---- Integer programming example with SCIP (natural language API) ----'
RunIntegerExampleNaturalLanguageAPI(
pywraplp.Solver.SCIP_MIXED_INTEGER_PROGRAMMING)
def RunAllIntegerExampleAlgebraicAPI():
if hasattr(pywraplp.Solver, 'GLPK_MIXED_INTEGER_PROGRAMMING'):
print ('---- Integer programming example with GLPK (algebraic API) -----')
RunIntegerExampleAlgebraicAPI(
pywraplp.Solver.GLPK_MIXED_INTEGER_PROGRAMMING)
if hasattr(pywraplp.Solver, 'CBC_MIXED_INTEGER_PROGRAMMING'):
print '---- Integer programming example with CBC (algebraic API) -----'
RunIntegerExampleAlgebraicAPI(pywraplp.Solver.CBC_MIXED_INTEGER_PROGRAMMING)
if hasattr(pywraplp.Solver, 'SCIP_MIXED_INTEGER_PROGRAMMING'):
print '---- Integer programming example with SCIP (algebraic API) -----'
RunIntegerExampleAlgebraicAPI(
pywraplp.Solver.SCIP_MIXED_INTEGER_PROGRAMMING)
def RunAllIntegerExampleCppStyleAPI():
print '---- Integer programming example with GLPK (C++ style API) ----'
RunIntegerExampleCppStyleAPI(pywraplp.Solver.GLPK_MIXED_INTEGER_PROGRAMMING)
print '---- Integer programming example with CBC (C++ style API) ----'
RunIntegerExampleCppStyleAPI(pywraplp.Solver.CBC_MIXED_INTEGER_PROGRAMMING)
print '---- Integer programming example with SCIP (C++ style API) ----'
RunIntegerExampleCppStyleAPI(pywraplp.Solver.SCIP_MIXED_INTEGER_PROGRAMMING)
if hasattr(pywraplp.Solver, 'GLPK_MIXED_INTEGER_PROGRAMMING'):
print '---- Integer programming example with GLPK (C++ style API) ----'
RunIntegerExampleCppStyleAPI(pywraplp.Solver.GLPK_MIXED_INTEGER_PROGRAMMING)
if hasattr(pywraplp.Solver, 'CBC_MIXED_INTEGER_PROGRAMMING'):
print '---- Integer programming example with CBC (C++ style API) ----'
RunIntegerExampleCppStyleAPI(pywraplp.Solver.CBC_MIXED_INTEGER_PROGRAMMING)
if hasattr(pywraplp.Solver, 'SCIP_MIXED_INTEGER_PROGRAMMING'):
print '---- Integer programming example with SCIP (C++ style API) ----'
RunIntegerExampleCppStyleAPI(
pywraplp.Solver.SCIP_MIXED_INTEGER_PROGRAMMING)
def main(unused_argv):
RunAllIntegerExampleNaturalLanguageAPI()
RunAllIntegerExampleAlgebraicAPI()
RunAllIntegerExampleCppStyleAPI()