Tanmoy Das
Data Scientist, currently final year in PhD at Dalhousie University. Working on a resource optimization problem
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Activity overview
Latest activity by Tanmoy Das-
Tanmoy Das created a post,
How to accurately calculate reduced cost when generating one column in column generation?
AnsweredHello good people, I am working on a variant of VRP & solving it using Column Generation. The objective function of the pricing problem is my reduced cost (RC) of each route/sequence. My initial ...
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Tanmoy Das commented,
Hi, Not the best way, but maybe you can extract each scenario using m.SingleScenarioModel(), and then optimize all of them to retrieve all solutions for each scenario. I am trying the below as well:
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Tanmoy Das commented,
Appreciate it. I will aim for that.
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Tanmoy Das created a post,
How to use non-defaults solution algorithm in Gurobi?
AnsweredHello, I am writing a MIP model in Gurobipy. As I understand from documentation that Gurobi by default uses B&C algorithm to solve a MIP problem. How can I use another solution algorithm (if any ot...
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Tanmoy Das commented,
I want to draw the linechart of iteration vs runtime & iteration vs % gap kinda similar to the below figure
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Tanmoy Das commented,
thank you. I applied your suggestion to the model.
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Tanmoy Das created a post,
How to print objective values, runtime of each iteration?
AnsweredHello, I need to print values of objective for each iteration (not just two iterations as shown below). I think callback function could be useful. But, cant find the correct syntax. Note: it's a MI...
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Tanmoy Das commented,
I also want to get the objective values (two objectives in my moo problem) in each iteration. Callback function gives me some ideas. I know my model went through 19 simplex iterations. I need the v...
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Tanmoy Das created a post,
How to add m.ModelSense for multiobjective optimization?
AnsweredHi, I have two objectives, one to maximize another one to minimize. How to tell the model that obj1 is maximization and obj2 is minimization? The below ModelSense will consider both objectives as m...
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Tanmoy Das created a post,
How to model constraint to send only when facility is open?
AnsweredHi, How can I implement a constraint so that resources from facility is sent to customer only when that facility is open? select is a binary variable to send resource r from station s. deploy is a...