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Error from adding too many variables with addVars()

Kyoung Yoon Kim
Gurobi-versary
First Question
First Comment

I'm trying to add a set of variables, 'x_jkjk' which has 7 indices.

When I run the model, it gives me the below error message.

-----------

Traceback (most recent call last):
File "model.py", line 321, in <module>
model_built = buildModel(computer, dict_input_path, dict_input_param, instance_paths, input_tuning_param)
File "model.py", line 172, in buildModel
x_jkjk = m.addVars(sender, receiver, sender, receiver, vehicle, type, scenario, vtype=GRB.INTEGER, name='x_jkjk')
File "model.pxi", line 2638, in gurobipy.Model.addVars
OverflowError: value too large to convert to int

-----------

 

I think the number of x_jkjk variable (20 * 20 * 20 * 20 * 2 * 2 * 40 = 25.6MM) is too large to handle.

Any suggestions to resolve this issue?

 

Thank you,

Kyoung

 

0

Comments

3 comments

Date Votes
  • Official comment
    Simranjit Kaur
    Gurobi Staff Gurobi Staff
    This post is more than three 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 why not try our AI Gurobot?.
  • Silke Horn
    Gurobi Staff Gurobi Staff

    I cannot reproduce the error by adding this amount of variables. I tried

    x_jkjk = m.addVars(20, 20, 20, 20, 2, 2, 40, vtype=GRB.INTEGER, name='x_jkjk')

    and I don't get an error.

    Could you post a minimal code example to reproduce the error?

    0
  • Kyoung Yoon Kim
    • Edited
    Gurobi-versary
    First Question
    First Comment

    Yes. I tried the line you provided and it works. 

    It is when I provide certain names to the set, addVars() gives an error. 

    For example, the below lines run okay.

    -------------

    import gurobipy as gp
    from gurobipy import GRB

    scenario = ['wsw305i2_5-1', 'wsw305i2_5-2', 'wsw305i2_5-3', 'wsw305i2_5-4', 'wsw305i2_5-5', 'w305i2_5-1', 'w305i2_5-2', 'w305i2_5-3', 'w305i2_5-4', 'w305i2_5-5', 'wnw305i2_5-1', 'wnw305i2_5-2', 'wnw305i2_5-3', 'wnw305i2_5-4', 'wnw305i2_5-5', 'nw305i2_5-1', 'nw305i2_5-2', 'nw305i2_5-3', 'nw305i2_5-4', 'nw305i2_5-5', 'nnw305i2_5-1', 'nnw305i2_5-2', 'nnw305i2_5-3', 'nnw305i2_5-4', 'nnw305i2_5-5', 'n305i2_5-1', 'n305i2_5-2', 'n305i2_5-3', 'n305i2_5-4', 'n305i2_5-5', 'nne305i2_5-1', 'nne305i2_5-2', 'nne305i2_5-3', 'nne305i2_5-4', 'nne305i2_5-5', 'ne305i2_5-1', 'ne305i2_5-2', 'ne305i2_5-3', 'ne305i2_5-4', 'ne305i2_5-5']

    sender = ['s002_GALVESTON', 's006_PORTARTHUR', 's007_PORTARTHUR', 's010_BAYTOWN', 's014_NASSAUBAY', 's015_LAKEJACKSON', 's020_HOUSTON', 's023_BEAUMONT', 's027_WEBSTER', 's029_HOUSTON', 's030_SUGARLAND', 's036_LEAGUECITY', 's044_RICHMOND', 's056_HOUSTON', 's058_THEWOODLANDS', 's060_HOUSTON', 's062_SUGARLAND', 's065_SUGARLAND', 's066_HOUSTON', 's071_NEDERLAND']

    receiver = ['r001_HOUSTON', 'r002_GRANBURY', 'r003_HOUSTON', 'r004_GONZALES', 'r005_KINGWOOD', 'r006_BEAUMONT', 'r007_TOMBALL', 'r008_THEWOODLANDS', 'r009_PASADENA', 'r010_CONROE', 'r011_SUGARLAND', 'r012_HUMBLE', 'r013_THEWOODLANDS', 'r014_KATY', 'r015_RICHMOND', 'r016_SUGARLAND', 'r017_CYPRESS', 'r018_THEWOODLANDS', 'r019_HUNTSVILLE', 'r020_SUGARLAND']

    ptype = ['p1', 'p2']
    vehicle = ['v1', 'v2']

    print(len(sender), len(receiver), len(sender), len(receiver), len(vehicle), len(ptype), len(scenario))
    m = gp.Model('model')
    x_jkjk = m.addVars(sender, receiver, sender, receiver, vehicle, ptype, scenario, vtype=GRB.INTEGER, name='x_jkjk')

    -------------

     

    These give an error.

    ------------

    import gurobipy as gp
    from gurobipy import GRB

    scenario = ['wsw305i2_5-1', 'wsw305i2_5-2', 'wsw305i2_5-3', 'wsw305i2_5-4', 'wsw305i2_5-5', 'w305i2_5-1', 'w305i2_5-2', 'w305i2_5-3', 'w305i2_5-4', 'w305i2_5-5', 'wnw305i2_5-1', 'wnw305i2_5-2', 'wnw305i2_5-3', 'wnw305i2_5-4', 'wnw305i2_5-5', 'nw305i2_5-1', 'nw305i2_5-2', 'nw305i2_5-3', 'nw305i2_5-4', 'nw305i2_5-5', 'nnw305i2_5-1', 'nnw305i2_5-2', 'nnw305i2_5-3', 'nnw305i2_5-4', 'nnw305i2_5-5', 'n305i2_5-1', 'n305i2_5-2', 'n305i2_5-3', 'n305i2_5-4', 'n305i2_5-5', 'nne305i2_5-1', 'nne305i2_5-2', 'nne305i2_5-3', 'nne305i2_5-4', 'nne305i2_5-5', 'ne305i2_5-1', 'ne305i2_5-2', 'ne305i2_5-3', 'ne305i2_5-4', 'ne305i2_5-5']

    sender = ['s002_GALVESTON', 's006_PORTARTHUR', 's007_PORTARTHUR', 's010_BAYTOWN', 's014_NASSAUBAY', 's015_LAKEJACKSON', 's020_HOUSTON', 's023_BEAUMONT', 's027_WEBSTER', 's029_HOUSTON', 's030_SUGARLAND', 's036_LEAGUECITY', 's044_RICHMOND', 's056_HOUSTON', 's058_THEWOODLANDS', 's060_HOUSTON', 's062_SUGARLAND', 's065_SUGARLAND', 's066_HOUSTON', 's071_NEDERLAND']

    receiver = ['r001_HOUSTON', 'r002_GRANBURY', 'r003_HOUSTON', 'r004_GONZALES', 'r005_KINGWOOD', 'r006_BEAUMONT', 'r007_TOMBALL', 'r008_THEWOODLANDS', 'r009_PASADENA', 'r010_CONROE', 'r011_SUGARLAND', 'r012_HUMBLE', 'r013_THEWOODLANDS', 'r014_KATY', 'r015_RICHMOND', 'r016_SUGARLAND', 'r017_CYPRESS', 'r018_THEWOODLANDS', 'r019_HUNTSVILLE', 'r020_SUGARLAND']

    ptype = ['critical', 'non-crit']
    vehicle = ['type00', 'type20']

    print(len(sender), len(receiver), len(sender), len(receiver), len(vehicle), len(ptype), len(scenario))
    m = gp.Model('model')
    x_jkjk = m.addVars(sender, receiver, sender, receiver, vehicle, ptype, scenario, vtype=GRB.INTEGER, name='x_jkjk')

    ------------

    The only change here is that I switched ptype from ['p1', 'p2'] to ['critical', 'non-crit'] and vehicle from ['v1', 'v2'] to ['type00', 'type20'].

    It is interesting that in this unique case, the method generates the error. It seems there's a limit on the length of indexes. 

     

     

     

     

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