Merge pull request 'lipatov_ilya_lab_2' (#46) from lipatov_ilya_lab_2 into main
Reviewed-on: http://student.git.athene.tech/Alexey/IIS_2023_1/pulls/46
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lipatov_ilya_lab_2/README.md
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lipatov_ilya_lab_2/README.md
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## Лабораторная работа №2
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### Ранжирование признаков
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## Выполнил студент группы ПИбд-41 Липатов Илья
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### Как запустить лабораторную работу:
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* установить python, numpy, matplotlib, sklearn
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* запустить проект (стартовая точка класс lab2)
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### Какие технологии использовались:
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* Язык программирования `Python`, библиотеки numpy, matplotlib, sklearn
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* Среда разработки `PyCharm`
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### Что делает лабораторная работа:
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* генерирует данные и обучает модели модели RandomizedLasso, Ridge,Random Forest Regressor.
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* ранжирует признаки с помощью моделей RandomizedLasso, Ridge,Random Forest Regressor.
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* отображает получившиеся значения\оценки каждого признака каждым методом\моделью и среднюю оценку.
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### Примеры работы:
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#### Результаты:
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* RandomizedLasso: 1, 2, 4, 5
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* Ridge: 4, 11, 12 и 1 или 2 (одинаковый результат)
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* Random Forest Regressor: 4, 1 11, 12
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#### Среднее: 4, 1, 2 и 5 признаки
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#### Графики результатов ранжирования признаков по каждой модели и средняя оценка:
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![Result](result.png)
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#### Средние оценки для признаков у каждой модели и средние оценки моделей:
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![Means](means.png)
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lipatov_ilya_lab_2/RandomizedLasso.py
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lipatov_ilya_lab_2/RandomizedLasso.py
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from sklearn.utils import check_X_y, check_random_state
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from sklearn.linear_model import Lasso
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from scipy.sparse import issparse
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from pandas._libs import sparse
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def _rescale_data(x, weights):
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if issparse(x):
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size = weights.shape[0]
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weight_dia = sparse.dia_matrix((1 - weights, 0), (size, size))
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x_rescaled = x * weight_dia
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else:
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x_rescaled = x * (1 - weights)
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return x_rescaled
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class RandomizedLasso(Lasso):
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def __init__(self, weakness=0.5, alpha=1.0, fit_intercept=True, normalize=False,
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precompute=False, copy_x=True, max_iter=1000,
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tol=1e-4, warm_start=False, positive=False,
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random_state=None, selection='cyclic'):
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self.weakness = weakness
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super(RandomizedLasso, self).__init__(
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alpha=alpha, fit_intercept=fit_intercept,
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normalize=normalize, precompute=precompute, copy_X=copy_x,
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max_iter=max_iter, tol=tol, warm_start=warm_start,
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positive=positive, random_state=random_state,
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selection=selection)
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def fit(self, x, y):
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if not isinstance(self.weakness, float) or not (0.0 < self.weakness <= 1.0):
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raise ValueError('weakness should be a float in (0, 1], got %s' % self.weakness)
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x, y = check_X_y(x, y, accept_sparse=True)
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n_features = x.shape[1]
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weakness = 1. - self.weakness
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random_state = check_random_state(self.random_state)
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weights = weakness * random_state.randint(0, 1 + 1, size=(n_features,))
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x_rescaled = _rescale_data(x, weights)
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return super(RandomizedLasso, self).fit(x_rescaled, y)
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lipatov_ilya_lab_2/lab2.py
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lipatov_ilya_lab_2/lab2.py
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from sklearn.ensemble import RandomForestRegressor
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from sklearn.preprocessing import MinMaxScaler
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from RandomizedLasso import RandomizedLasso
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from sklearn.linear_model import Ridge
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from matplotlib import pyplot as plt
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import numpy as np
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np.random.seed(0)
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size = 1000
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X = np.random.uniform(0, 1, (size, 14))
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Y = (10 * np.sin(np.pi * X[:, 0] * X[:, 1]) + 20 * (X[:, 2] - .5) ** 2 + 10 * X[:, 3] + 5 * X[:, 4] ** 5 + np.random.normal(0, 1))
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X[:, 10:] = X[:, :4] + np.random.normal(0, .025, (size, 4))
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ridge = Ridge(alpha=1.0)
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ridge.fit(X, Y)
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lasso = RandomizedLasso(alpha=0.007)
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lasso.fit(X, Y)
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randForestRegression = RandomForestRegressor(max_depth=4, min_samples_leaf=1, min_impurity_decrease=0, ccp_alpha=0)
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randForestRegression.fit(X, Y)
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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(np.array(ranks).reshape(14, 1)).ravel()
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ranks = map(lambda x: round(x, 2), ranks)
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return dict(zip(names, ranks))
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ranks = {'Ridge': {}, 'RandomizedLasso': {}, 'RandomForestRegressor': {}}
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names = ["x%s" % i for i in range(1, 15)]
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ranks["Ridge"] = rank_to_dict(ridge.coef_, names)
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ranks["RandomizedLasso"] = rank_to_dict(lasso.coef_, names)
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ranks["RandomForestRegressor"] = rank_to_dict(randForestRegression.feature_importances_, names)
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mean = {}
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for key, value in ranks.items():
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for item in value.items():
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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, 2)
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print('VALUES')
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for r in ranks.items():
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print(r)
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print('MEAN')
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print(mean)
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for i, (model_name, features) in enumerate(ranks.items()):
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subplot = plt.subplot(2, 2, i + 1)
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subplot.set_title(model_name)
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subplot.bar(list(features.keys()), list(features.values()))
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subplot = plt.subplot(2, 2, 4)
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subplot.set_title('Mean')
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subplot.bar(list(mean.keys()), list(mean.values()))
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plt.show()
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lipatov_ilya_lab_2/means.png
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lipatov_ilya_lab_2/result.png
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