Systemy-rozmyte-sql/backend/cars/fuzzy_logic.py

import numpy as np
import skfuzzy as fuzz
from skfuzzy import control as ctrl
from django.conf import settings


def get_fuzzy_response(request_params, objects_list):

    # Stworzenie uniwersum
    production_year = ctrl.Antecedent(np.arange(1960, 2022, 1), "production_year")
    mileage = ctrl.Antecedent(np.arange(0, 500000, 1), "mileage")
    engine_capacity = ctrl.Antecedent(np.arange(0.7, 8.2, 0.1), "engine_capacity")
    combustion = ctrl.Antecedent(np.arange(4.0, 15.0, 0.1), "combustion")

    # Tworzenie funkcji rozmytych
    production_year["low"] = fuzz.trimf(
        production_year.universe, settings.PRODUCTION_YEAR["low"]
    )
    production_year["mid"] = fuzz.trimf(
        production_year.universe, settings.PRODUCTION_YEAR["mid"]
    )
    production_year["high"] = fuzz.trimf(
        production_year.universe, settings.PRODUCTION_YEAR["high"]
    )

    mileage["low"] = fuzz.trimf(mileage.universe, settings.MILEAGE["low"])
    mileage["mid"] = fuzz.trimf(mileage.universe, settings.MILEAGE["mid"])
    mileage["high"] = fuzz.trimf(mileage.universe, settings.MILEAGE["high"])

    engine_capacity["low"] = fuzz.trimf(
        engine_capacity.universe, settings.ENGINE_CAPACITY["low"]
    )
    engine_capacity["mid"] = fuzz.trimf(
        engine_capacity.universe, settings.ENGINE_CAPACITY["mid"]
    )
    engine_capacity["high"] = fuzz.trimf(
        engine_capacity.universe, settings.ENGINE_CAPACITY["high"]
    )

    combustion["low"] = fuzz.trimf(combustion.universe, settings.COMBUSTION["low"])
    combustion["mid"] = fuzz.trimf(combustion.universe, settings.COMBUSTION["mid"])
    combustion["high"] = fuzz.trimf(combustion.universe, settings.COMBUSTION["high"])

    # Obliczanie przynaleznosci danego obiektu do podanych danych kwerendy i tworzenie przefiltrowanej listy
    end_object_list = []
    for car in objects_list:
        comparator = []
        if "production_year" in request_params:
            comparator.append(
                fuzz.interp_membership(
                    production_year.universe,
                    production_year[str(request_params["production_year"])].mf,
                    car.production_year,
                )
            )
        if "mileage" in request_params:
            comparator.append(
                fuzz.interp_membership(
                    mileage.universe,
                    mileage[str(request_params["mileage"])].mf,
                    car.mileage,
                )
            )
        if "engine_capacity" in request_params:
            comparator.append(
                fuzz.interp_membership(
                    engine_capacity.universe,
                    engine_capacity[str(request_params["engine_capacity"])].mf,
                    car.engine_capacity,
                )
            )
        if "combustion" in request_params:
            comparator.append(
                fuzz.interp_membership(
                    combustion.universe,
                    combustion[str(request_params["combustion"])].mf,
                    car.combustion,
                )
            )
        if min(comparator) > settings.COMPARATOR:
            end_object_list.append(car)

    return end_object_list