How to save the time column in the solution log to a variable？

[xiaoyezi55]

solver = pywraplp.Solver.CreateSolver('SCIP')

solver.EnableOutput()

How to save the time column in the solution log to a variable？

[lperron]

scip outputs to stdout. You need to intercept this.

Math-opt will allow to intercept this with a callback.

[xiaoyezi55]

May I ask how to implement it

[lperron]

I do not know. This is a python question, not an OR-Tools one. Laurent Perron | Operations Research | ***@***.*** | (33) 1 42 68 53 00 Le jeu. 7 mars 2024 à 10:55, xiaoyezi55 ***@***.***> a écrit :

…

May I ask how to implement it — Reply to this email directly, view it on GitHub <#4117 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACUPL3KPF332XLAL6V74W3LYXA2SJAVCNFSM6AAAAABEKUS5P6VHI2DSMVQWIX3LMV43SRDJONRXK43TNFXW4Q3PNVWWK3TUHM4DOMBUHA4TA> . You are receiving this because you modified the open/close state.Message ID: ***@***.***>

[xiaoyezi55]

Is there any way to obtain the OR-Tools optimization time progress percentage？

[lperron]

the question makes no sense. there is not a 'ortools optimization time progress'. You create the time limit. Why don't you check time in python and compare it with the time limit you set ? Laurent Perron | Operations Research | ***@***.*** | (33) 1 42 68 53 00 Le jeu. 7 mars 2024 à 11:11, xiaoyezi55 ***@***.***> a écrit :

…

Is there any way to obtain the OR-Tools optimization time progress percentage？ — Reply to this email directly, view it on GitHub <#4117 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACUPL3MPNXN7NI3QHVUN4GTYXA4NXAVCNFSM6AAAAABEKUS5P6VHI2DSMVQWIX3LMV43SRDJONRXK43TNFXW4Q3PNVWWK3TUHM4DOMBVGA4DA> . You are receiving this because you modified the open/close state.Message ID: ***@***.***>

[xiaoyezi55]

import time
from ortools.linear_solver import pywraplp

创建求解器并设置时间限制

solver = pywraplp.Solver.CreateSolver('SCIP')
solver.set_time_limit(300000) # 设置时间限制为300秒

定义你的优化问题

...

记录开始时间

start_time = time.time()

求解问题

status = solver.Solve()

if status == pywraplp.Solver.OPTIMAL or status == pywraplp.Solver.FEASIBLE:
end_time = time.time()
elapsed_time = end_time - start_time
progress_percentage = 100
print(f"Optimization completed in {elapsed_time} seconds. Progress: {progress_percentage}%")
else:

end_time = time.time()
elapsed_time = end_time - start_time
progress_percentage = (elapsed_time / 300000) * 100  
print(f"Optimization still running. Elapsed time: {elapsed_time} seconds. Estimated progress: {progress_percentage}%")

The above code can only output optimization progress after optimization is completed. How to output optimization time progress percentage during the optimization process

[lperron]

is your problem integral ? If so, use CP-SAT. It is a better ILP solver, and it supports solution callbacks in all languages. Laurent Perron | Operations Research | ***@***.*** | (33) 1 42 68 53 00 Le jeu. 7 mars 2024 à 11:24, xiaoyezi55 ***@***.***> a écrit :

…

import time from ortools.linear_solver import pywraplp 创建求解器并设置时间限制 solver = pywraplp.Solver.CreateSolver('SCIP') solver.set_time_limit(300000) # 设置时间限制为300秒 定义你的优化问题 ... 记录开始时间 start_time = time.time() 求解问题 status = solver.Solve() if status == pywraplp.Solver.OPTIMAL or status == pywraplp.Solver.FEASIBLE: end_time = time.time() elapsed_time = end_time - start_time progress_percentage = 100 print(f"Optimization completed in {elapsed_time} seconds. Progress: {progress_percentage}%") else: end_time = time.time() elapsed_time = end_time - start_time progress_percentage = (elapsed_time / 300000) * 100 print(f"Optimization still running. Elapsed time: {elapsed_time} seconds. Estimated progress: {progress_percentage}%") The above code can only output optimization progress after optimization is completed. How to output optimization time progress percentage during the optimization process — Reply to this email directly, view it on GitHub <#4117 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACUPL3N74EU7YRZV7EY7MEDYXA54JAVCNFSM6AAAAABEKUS5P6VHI2DSMVQWIX3LMV43SRDJONRXK43TNFXW4Q3PNVWWK3TUHM4DOMBVGI3DO> . You are receiving this because you modified the open/close state.Message ID: ***@***.***>

[xiaoyezi55]

OK thanks!