Model too large for size-limited license despite WLS license

回答済み

Alexandre Touzet

2024年01月08日 10:58 編集済み

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Hello, 

I have a web application that makes use of a WLS license to create and solve optimization models, and until 2 weeks ago everything was working perfectly. I didn't use my application for two weeks, and now I am getting the following error, even though nothing changed: "An error occurred during optimization: Model too large for size-limited license; visit https://www.gurobi.com/free-trial for a full license".

The license expires in March 2024. I pass the credentials via parameters to the Gurobi environment directly, and when I write them down it shows the credentials of the license perfectly. I even tried generating a new license file with new credentials but it didn't change anything.

I pass the parameters as follows:

def read_gurobi_license_from_secrets():
    license_data = {
        'WLSACCESSID': st.secrets['WLSACCESSID'],
        'WLSSECRET': st.secrets['WLSSECRET'],
        'LICENSEID': int(st.secrets['LICENSEID'])  # Cast to int because secrets are loaded as strings
    }
    return license_data
    
def init_gurobi_env_from_secrets():
    license_data = read_gurobi_license_from_secrets()
    env = gp.Env(params=license_data)
    return env

env = init_gurobi_env_from_secrets()

[...]

trains_scheduling_ordered, equipment_scheduling = milp_stage_1_and_2_app(df1,earliest_arrival,end_date_latest_arrival,env)

And the function milp_stage_1_and_2_app is defined as follows:

def milp_stage_1_and_2_app(df1,earliest_arrival,end_date_latest_arrival,env):
    
    [rest of the code to create and solve the model]

    return(trains_scheduling_ordered,equipment_scheduling)

It was working perfectly until now so I really don't know what is going wrong... Any help would be extremely appreciated. Thank you! 

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• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2026年11月13日 01:31

  This post is more than two years old. Some information may not be up to date. For current information, please check the Gurobi Documentation or Knowledge Base. If you need more help, please create a new post in the community forum, or try Gurobot, our chatbot interface offering instant, expert-level support.
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  Mario Ruthmair

  • Gurobi Staff

  2024年01月08日 11:56

  Hi Alexandre,

  Could you show us the Gurobi output? Does it show license messages referring to your WLS license?
  Could you also show us the line that creates the model?

  Best regards,
  Mario

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  Alexandre Touzet

  2024年01月08日 13:11

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  Thanks to your message I found the problem! 

  I was creating the model with:

  m = gp.Model("multi_objective_model")

  And not:

  m = gp.Model("multi_objective_model",env=env)

  Thank you!

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  Mario Ruthmair

  • Gurobi Staff

  2024年01月08日 13:31

  Thanks for reporting the solution! This might be helpful for others, too!

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