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experimental support for dynamic loading of gurobi; add MPSolver.CreateSolver() factory method for non C++ languages to check correctly installed linear solver backends and licenses when needed; port all non C++ examples

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This commit is contained in:
Laurent Perron
2020-06-24 18:11:12 +02:00
parent 2f7e8e9eb8
commit d6ecea46ad
42 changed files with 1268 additions and 315 deletions
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78
examples/python/integer_programming.py
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@@ -17,10 +17,21 @@ from __future__ import print_function
from ortools.linear_solver import pywraplp
def Announce(solver, api_type):
print('---- Integer programming example with ' + solver + ' (' + api_type +
') -----')
def RunIntegerExampleNaturalLanguageAPI(optimization_problem_type):
"""Example of simple integer program with natural language API."""
solver = pywraplp.Solver('RunIntegerExampleNaturalLanguageAPI',
optimization_problem_type)
solver = pywraplp.Solver.CreateSolver('RunIntegerExampleNaturalLanguageAPI',
optimization_problem_type)
if not solver:
return
Announce(optimization_problem_type, 'natural language API')
infinity = solver.infinity()
# x1 and x2 are integer non-negative variables.
x1 = solver.IntVar(0.0, infinity, 'x1')
@@ -34,8 +45,13 @@ def RunIntegerExampleNaturalLanguageAPI(optimization_problem_type):
def RunIntegerExampleCppStyleAPI(optimization_problem_type):
"""Example of simple integer program with the C++ style API."""
solver = pywraplp.Solver('RunIntegerExampleCppStyleAPI',
optimization_problem_type)
solver = pywraplp.Solver.CreateSolver('RunIntegerExampleCppStyleAPI',
optimization_problem_type)
if not solver:
return
Announce(optimization_problem_type, 'C++ style API')
infinity = solver.infinity()
# x1 and x2 are integer non-negative variables.
x1 = solver.IntVar(0.0, infinity, 'x1')
@@ -59,7 +75,6 @@ def SolveAndPrint(solver, variable_list):
print('Number of variables = %d' % solver.NumVariables())
print('Number of constraints = %d' % solver.NumConstraints())
solver.SetNumThreads(8)
result_status = solver.Solve()
# The problem has an optimal solution.
@@ -82,55 +97,18 @@ def SolveAndPrint(solver, variable_list):
print('Problem solved in %d branch-and-bound nodes' % solver.nodes())
def Announce(solver, api_type):
print('---- Integer programming example with ' + solver + ' (' + api_type +
') -----')
def RunAllIntegerExampleNaturalLanguageAPI():
if hasattr(pywraplp.Solver, 'GLPK_MIXED_INTEGER_PROGRAMMING'):
Announce('GLPK', 'natural language API')
RunIntegerExampleNaturalLanguageAPI(
pywraplp.Solver.GLPK_MIXED_INTEGER_PROGRAMMING)
if hasattr(pywraplp.Solver, 'CBC_MIXED_INTEGER_PROGRAMMING'):
Announce('CBC', 'natural language API')
RunIntegerExampleNaturalLanguageAPI(
pywraplp.Solver.CBC_MIXED_INTEGER_PROGRAMMING)
if hasattr(pywraplp.Solver, 'SCIP_MIXED_INTEGER_PROGRAMMING'):
Announce('SCIP', 'natural language API')
RunIntegerExampleNaturalLanguageAPI(
pywraplp.Solver.SCIP_MIXED_INTEGER_PROGRAMMING)
if hasattr(pywraplp.Solver, 'GUROBI_MIXED_INTEGER_PROGRAMMING'):
Announce('GUROBI', 'natural language API')
RunIntegerExampleNaturalLanguageAPI(
pywraplp.Solver.GUROBI_MIXED_INTEGER_PROGRAMMING)
if hasattr(pywraplp.Solver, 'CPLEX_MIXED_INTEGER_PROGRAMMING'):
Announce('CPLEX', 'natural language API')
RunIntegerExampleNaturalLanguageAPI(
pywraplp.Solver.CPLEX_MIXED_INTEGER_PROGRAMMING)
RunIntegerExampleNaturalLanguageAPI('GLPK')
RunIntegerExampleNaturalLanguageAPI('CBC')
RunIntegerExampleNaturalLanguageAPI('SCIP')
RunIntegerExampleNaturalLanguageAPI('SAT')
def RunAllIntegerExampleCppStyleAPI():
if hasattr(pywraplp.Solver, 'GLPK_MIXED_INTEGER_PROGRAMMING'):
Announce('GLPK', 'C++ style API')
RunIntegerExampleCppStyleAPI(
pywraplp.Solver.GLPK_MIXED_INTEGER_PROGRAMMING)
if hasattr(pywraplp.Solver, 'CBC_MIXED_INTEGER_PROGRAMMING'):
Announce('CBC', 'C++ style API')
RunIntegerExampleCppStyleAPI(
pywraplp.Solver.CBC_MIXED_INTEGER_PROGRAMMING)
if hasattr(pywraplp.Solver, 'SCIP_MIXED_INTEGER_PROGRAMMING'):
Announce('SCIP', 'C++ style API')
RunIntegerExampleCppStyleAPI(
pywraplp.Solver.SCIP_MIXED_INTEGER_PROGRAMMING)
if hasattr(pywraplp.Solver, 'GUROBI_MIXED_INTEGER_PROGRAMMING'):
Announce('GUROBI', 'C++ style API')
RunIntegerExampleCppStyleAPI(
pywraplp.Solver.GUROBI_MIXED_INTEGER_PROGRAMMING)
if hasattr(pywraplp.Solver, 'CPLEX_MIXED_INTEGER_PROGRAMMING'):
Announce('CPLEX', 'C++ style API')
RunIntegerExampleCppStyleAPI(
pywraplp.Solver.CPLEX_MIXED_INTEGER_PROGRAMMING)
RunIntegerExampleCppStyleAPI('GLPK')
RunIntegerExampleCppStyleAPI('CBC')
RunIntegerExampleCppStyleAPI('SCIP')
RunIntegerExampleCppStyleAPI('SAT')
def main():