ZeroDivisionError in CPU partition calculation

[noahsherrill]

I set up a simple problem and ran into a ZeroDivisionError. The configuration file is as follows:

{
  "application_name": "param_values_test",
  "optimization_objectives": ["value"],
  "optimization_iterations": 5,
  "input_parameters": {
    "param_1": {
      "parameter_type": "integer",
      "values": [4, 12],
      "parameter_default": 10
    }
  }
}

The code is as follows:

from hypermapper import optimizer

def test_function(parameters):
    return (6 - parameters["param_1"]) ** 2

if __name__ == "__main__":
    parameters_file_path = "param_values_test.json"
    optimizer.optimize(parameters_file_path, test_function)

The output is as follows:

Design of experiment phase, number of new doe samples = 9 .......
param_1,value,Timestamp
10,16,1
4,4,1
5,1,1
6,0,1
7,1,1
8,4,1
9,9,2
11,25,2
12,36,2

End of doe/resume phase, the number of evaluated configurations is: 10

Starting optimization iteration 1
Traceback (most recent call last):
  File "hypermapper_param_values_test.py", line 10, in <module>
    optimizer.optimize(parameters_file_path, test_function)
  File "/usr/local/lib/python3.6/site-packages/hypermapper/optimizer.py", line 125, in optimize
    config, black_box_function=black_box_function, profiling=profiling
  File "/usr/local/lib/python3.6/site-packages/hypermapper/bo.py", line 446, in main
    profiling,
  File "/usr/local/lib/python3.6/site-packages/hypermapper/random_scalarizations.py", line 541, in random_scalarizations
    profiling=profiling,
  File "/usr/local/lib/python3.6/site-packages/hypermapper/local_search.py", line 401, in local_search
    partitions_per_cpu * number_of_cpus
ZeroDivisionError: division by zero

[noahsherrill]

This was using HyperMapper Version 2.2.3.

[arturluis]

Hey @noahsherrill ,

Thanks for providing the json and .py files, I'll investigate what is causing this issue and get back to you.

[hvarfner]

@noahsherrill Thanks for the really simple way to recreate the error. Turns out we didn't know what to do when the number of CPUs surpassed the number of possible configurations.

[noahsherrill]

@hvarfner, I no longer see this error in HyperMapper Version 2.2.4. Thank you for the fix!