prodplan_gen.py

# Problem generator for Production Planning Instances
# Author: Fabian Leuthold

import random


def create_prod_plan_problem(num_machines, num_jobs):
    """
    Generate a Production Planning problem instance

    :param num_machines: the number of (identical) machines available
    :param num_jobs:  the number of jobs to assign to the machines
    :return: 
    """
    name = f"PRODPLAN_M{num_machines}_J{num_jobs}"
    file_name = f"./data/{name}.ppl"
    comment = f"Assign {num_jobs} jobs with given duration to {num_machines} sequences processed on" \
              f" {num_machines} (identic) machines (Leuthold)"

    random.seed(1)

    # Start des Problem-Textformats
    problem_text = []
    problem_text.append(f"NAME: {name}")
    problem_text.append("TYPE: PRODPLAN_PROBLEM")
    problem_text.append(f"COMMENT: {comment}")
    problem_text.append(f"NUM_MACHINES: {num_machines}")
    problem_text.append(f"NUM_JOBS: {num_jobs}")
    problem_text.append("JOBS_ID_DURATION")

    # Hinzufügen der Job-Dauern
    for job_id in range(1, num_jobs + 1):
        duration = round(random.uniform(0.5, 10), 1)
        problem_text.append(f"{job_id} {duration}")

    # EOF
    problem_text.append("EOF")

    # Schreibe den Textinhalt in die Datei
    with open(file_name, "w") as file:
        file.write("\n".join(problem_text))
    return


def main():
    create_prod_plan_problem(num_machines=2, num_jobs=53)
    create_prod_plan_problem(num_machines=2, num_jobs=21)
    create_prod_plan_problem(num_machines=4, num_jobs=32)


if __name__ == "__main__":
    main()