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malkova_anastasia_lab_5/README.md
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malkova_anastasia_lab_5/README.md
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# Лабораторная работа №5
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> Регрессия
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### Как запустить лабораторную работу
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1. Установить python, numpy, sklearn
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2. Запустить команду `python main1.py` в корне проекта для запуска 1 части
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3. Запустить команду `python main2.py` в корне проекта для запуска 2 части
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### Использованные технологии
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* Язык программирования `python`
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* Библиотеки `numpy, sklearn`
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* Среда разработки `PyCharm`
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### Что делает программа?
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Цель программы: на основе данных об автомобилях на вторичном рынке обучить модель регрессии на предсказание цены.
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Используемая модель: Лассо-регрессия
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#### Определим признаки
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LINEAR [('Year', 1.0), ('Mileage', 0.4868), ('State', 0.0729), ('Vin', 0.015), ('City', 0.0037), ('Model', 0.0002), ('Make', 0.0)]
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RIDGE [('Year', 1.0), ('Mileage', 0.4868), ('State', 0.0729), ('Vin', 0.015), ('City', 0.0037), ('Model', 0.0002), ('Make', 0.0)]
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LASSO [('Year', 1.0), ('Mileage', 0.4868), ('State', 0.0729), ('Vin', 0.015), ('City', 0.0037), ('Model', 0.0002), ('Make', 0.0)]
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RFE [('Year', 1.0), ('State', 1.0), ('Mileage', 1.0), ('City', 0.5), ('Vin', 0.5), ('Model', 0.0), ('Make', 0.0)]
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f_regression [('Year', 1.0), ('State', 0.1438), ('Vin', 0.0878), ('City', 0.0845), ('Mileage', 0.0711), ('Model', 0.0335), ('Make', 0.0)]
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MEAN [('Year', 0.2), ('Mileage', 0.0974), ('State', 0.0146), ('Vin', 0.003), ('City', 0.0007), ('Model', 0.0), ('Make', 0.0)]
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Отсечение признаков, у которых MEAN ниже 0.001. Выделенные признаки для дальнейшего обучения модели Lasso.
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##### Запуск модели Lasso с параметрами
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![main2.py](main2.png)
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#### Итоговые выводы
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Были выбраны основные признаки для обучения модели, которые имеют большее влияние на предсказание.
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Проведены несколько тестов по обучению модели Lasso с разными alpha (силой влияния регуляризации),
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но это не оказало большого влияния. Точность в 94.33% приемлемая.
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malkova_anastasia_lab_5/config.py
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malkova_anastasia_lab_5/config.py
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LINEAR_TITLE = 'LINEAR'
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RIDGE_TITLE = 'RIDGE'
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LASSO_TITLE = 'LASSO'
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RFE_TITLE = 'RFE'
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F_REGRESSION_TITLE = 'f_regression'
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DATA_SIZE = 1000
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FEATURES_AMOUNT = 14
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malkova_anastasia_lab_5/dataset.py
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malkova_anastasia_lab_5/dataset.py
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import pandas as pd
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from config import DATA_SIZE
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def load_dataset():
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data = pd.read_csv('true_car_listings.csv')[:DATA_SIZE]
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names = ['Year', 'Mileage', 'City', 'State', 'Vin', 'Make', 'Model']
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convert_to_num(data, 'City')
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convert_to_num(data, 'State')
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convert_to_num(data, 'Vin')
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convert_to_num(data, 'Make')
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convert_to_num(data, 'Model')
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Y = data['Price']
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X = data[names]
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return X, Y, names
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def convert_to_num(data, col):
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unique_numbers = list(set(data[col]))
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data[col] = data[col].apply(unique_numbers.index)
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malkova_anastasia_lab_5/fit.py
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malkova_anastasia_lab_5/fit.py
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from sklearn.linear_model import Lasso, Ridge, LinearRegression
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from sklearn.feature_selection import RFE, f_regression
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def fit_models(x, y):
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lm = LinearRegression()
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lm.fit(x, y)
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ridge = Ridge(alpha=0.001)
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ridge.fit(x, y)
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lasso = Lasso(alpha=0.001)
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lasso.fit(x, y)
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rfe = RFE(lasso, step=2)
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rfe.fit(x, y)
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f, pval = f_regression(x, y, center=False)
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return lm, ridge, lasso, rfe, f
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malkova_anastasia_lab_5/lasso_test.py
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malkova_anastasia_lab_5/lasso_test.py
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from scores import MAPE
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from sklearn.linear_model import Lasso
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def lasso_test(X_train, X_test, y_train, y_test, alpha):
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lasso = Lasso(alpha=alpha)
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# Train model
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lasso.fit(X_train, y_train)
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# Show score of model
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lasso_predict = lasso.predict(X_test)
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lasso_MAPE = MAPE(y_test, lasso_predict)
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print("MAPE value: ", lasso_MAPE)
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Accuracy = 100 - lasso_MAPE
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print(
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'Accuracy of Lasso Regression(alpha={:}): {:0.2f}%.'.format(alpha, Accuracy))
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malkova_anastasia_lab_5/main1.py
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malkova_anastasia_lab_5/main1.py
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from dataset import load_dataset
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from fit import fit_models
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from ranks import calc_mean, get_ranks
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x, y, names = load_dataset()
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lm, ridge, lasso, rfe, f = fit_models(x, y)
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ranks = get_ranks(lm, ridge, lasso, rfe, f, names)
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mean = calc_mean(ranks)
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print("MEAN", mean)
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malkova_anastasia_lab_5/main2.png
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malkova_anastasia_lab_5/main2.png
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malkova_anastasia_lab_5/main2.py
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malkova_anastasia_lab_5/main2.py
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from sklearn.model_selection import train_test_split
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from dataset import load_dataset
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from lasso_test import lasso_test
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# Load dataset
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X, Y, name = load_dataset()
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# Split dataset
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X_train, X_test, y_train, y_test = train_test_split(
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X, Y, test_size=0.05, random_state=42)
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for i in range(6):
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lasso_test(X_train, X_test, y_train, y_test, i/pow(10, i))
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malkova_anastasia_lab_5/ranks.py
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malkova_anastasia_lab_5/ranks.py
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import config
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import numpy as np
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from sklearn.preprocessing import MinMaxScaler
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from operator import itemgetter
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from sklearn.linear_model import Lasso, Ridge, LinearRegression
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def rank_to_dict(ranks, names):
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ranks = np.abs(ranks)
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minmax = MinMaxScaler()
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ranks = minmax.fit_transform(
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np.array(ranks).reshape(len(names), 1)).ravel()
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ranks = map(lambda x: round(x, 4), ranks)
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ranks = dict(zip(names, ranks))
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ranks = sorted(ranks.items(), key=itemgetter(1), reverse=True)
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return ranks
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def flip_array(arr):
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return -1 * arr + np.max(arr)
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def get_ranks(lm: LinearRegression, ridge: Ridge, lasso: Lasso, rfe, f, names):
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ranks = dict()
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ranks[config.LINEAR_TITLE] = rank_to_dict(lm.coef_, names)
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ranks[config.RIDGE_TITLE] = rank_to_dict(ridge.coef_, names)
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ranks[config.LASSO_TITLE] = rank_to_dict(lasso.coef_, names)
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ranks[config.RFE_TITLE] = rank_to_dict(flip_array(rfe.ranking_), names)
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ranks[config.F_REGRESSION_TITLE] = rank_to_dict(f, names)
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for key, value in ranks.items():
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print(key, value, '\n')
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return ranks
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def calc_mean(ranks):
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mean = {}
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for key, value in ranks.items():
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for item in value:
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if (item[0] not in mean):
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mean[item[0]] = 0
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mean[item[0]] += item[1]
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for key, value in mean.items():
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res = value/len(ranks)
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mean[key] = round(res, 4)
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return sorted(mean.items(), key=itemgetter(1), reverse=True)
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malkova_anastasia_lab_5/scores.py
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malkova_anastasia_lab_5/scores.py
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import numpy as np
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def MAPE(Y_actual, Y_Predicted):
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mape = np.mean(np.abs((Y_actual - Y_Predicted)/Y_actual))*100
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return mape
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852123
malkova_anastasia_lab_5/true_car_listings.csv
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malkova_anastasia_lab_5/true_car_listings.csv
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