354 KiB
354 KiB
In [13]:
import pandas as pd
import matplotlib.pyplot as plt
from sklearn.preprocessing import LabelEncoder
from sklearn.cluster import AgglomerativeClustering
from sklearn.cluster import KMeans
from sklearn.metrics import silhouette_score
from sklearn.decomposition import PCA
from sklearn import metrics
from imblearn.over_sampling import RandomOverSampler
from imblearn.under_sampling import RandomUnderSampler
from sklearn.preprocessing import StandardScaler, OneHotEncoder
from sklearn.metrics import ConfusionMatrixDisplay
from sklearn.compose import ColumnTransformer
from sklearn.pipeline import Pipeline
from sklearn.impute import SimpleImputer
from sklearn.linear_model import LinearRegression, LogisticRegression
from sklearn.ensemble import RandomForestRegressor, GradientBoostingRegressor, RandomForestClassifier, GradientBoostingClassifier
from sklearn.model_selection import train_test_split, GridSearchCV
from sklearn.metrics import (
precision_score, recall_score, accuracy_score, roc_auc_score, f1_score,
matthews_corrcoef, cohen_kappa_score, confusion_matrix
)
from sklearn.metrics import mean_squared_error, r2_score, mean_absolute_error
import numpy as np
import featuretools as ft
from sklearn.metrics import accuracy_score, classification_report
# Функция для применения oversampling
def apply_oversampling(X, y):
oversampler = RandomOverSampler(random_state=42)
X_resampled, y_resampled = oversampler.fit_resample(X, y)
return X_resampled, y_resampled
# Функция для применения undersampling
def apply_undersampling(X, y):
undersampler = RandomUnderSampler(random_state=42)
X_resampled, y_resampled = undersampler.fit_resample(X, y)
return X_resampled, y_resampled
def split_stratified_into_train_val_test(
df_input,
stratify_colname="y",
frac_train=0.6,
frac_val=0.15,
frac_test=0.25,
random_state=None,
):
"""
Splits a Pandas dataframe into three subsets (train, val, and test)
following fractional ratios provided by the user, where each subset is
stratified by the values in a specific column (that is, each subset has
the same relative frequency of the values in the column). It performs this
splitting by running train_test_split() twice.
Parameters
----------
df_input : Pandas dataframe
Input dataframe to be split.
stratify_colname : str
The name of the column that will be used for stratification. Usually
this column would be for the label.
frac_train : float
frac_val : float
frac_test : float
The ratios with which the dataframe will be split into train, val, and
test data. The values should be expressed as float fractions and should
sum to 1.0.
random_state : int, None, or RandomStateInstance
Value to be passed to train_test_split().
Returns
-------
df_train, df_val, df_test :
Dataframes containing the three splits.
"""
if frac_train + frac_val + frac_test != 1.0:
raise ValueError(
"fractions %f, %f, %f do not add up to 1.0"
% (frac_train, frac_val, frac_test)
)
if stratify_colname not in df_input.columns:
raise ValueError("%s is not a column in the dataframe" % (stratify_colname))
X = df_input # Contains all columns.
y = df_input[
[stratify_colname]
] # Dataframe of just the column on which to stratify.
# Split original dataframe into train and temp dataframes.
df_train, df_temp, y_train, y_temp = train_test_split(
X, y, stratify=y, test_size=(1.0 - frac_train), random_state=random_state
)
# Split the temp dataframe into val and test dataframes.
relative_frac_test = frac_test / (frac_val + frac_test)
df_val, df_test, y_val, y_test = train_test_split(
df_temp,
y_temp,
stratify=y_temp,
test_size=relative_frac_test,
random_state=random_state,
)
assert len(df_input) == len(df_train) + len(df_val) + len(df_test)
return df_train, df_val, df_test
df = pd.read_csv("../data/age.csv", nrows=10000)
df.info()
Вариант: Список людей. Бизнес-цель: реклама. Необходимо разбить людей на группы, чтобы показывать им определенную рекламу в приложениях
In [4]:
df.fillna({"Gender": "NaN", "Country": "NaN", "Occupation" : "NaN", "Manner of death" : "NaN"}, inplace=True)
df = df.dropna()
df['Country'] = df['Country'].str.split('; ')
df = df.explode('Country')
data = df.copy()
value_counts = data["Country"].value_counts()
rare = value_counts[value_counts < 100].index
data = data[~data["Country"].isin(rare)]
data.drop(data[~data['Gender'].isin(['Male', 'Female'])].index, inplace=True)
data1 = data[["Country", "Age of death", "Gender"]]
data1 = pd.get_dummies(data1, drop_first=True)
#data1 = pd.get_dummies(data, columns=['Gender', 'Country', 'Occupation'], drop_first=True)
In [10]:
pca = PCA(n_components=2)
data_pca = pca.fit_transform(data1)
print(data_pca)
plt.figure(figsize=(10, 8))
plt.scatter(data_pca[:, 0], data_pca[:, 1], alpha=0.5)
plt.title('PCA')
plt.xlabel('1')
plt.ylabel('2')
plt.show()
In [12]:
# Оценка инерции
inertia = []
for k in range(1, 11):
kmeans = KMeans(n_clusters=k, random_state=42)
kmeans.fit(data_pca)
inertia.append(kmeans.inertia_)
plt.figure(figsize=(10, 6))
plt.plot(range(1, 11), inertia, marker='o')
plt.title('Оценка инерции')
plt.xlabel('Количество кластеров')
plt.ylabel('Инерция')
plt.show()
# Оценка коэффициента силуэта
silhouette_scores = []
for k in range(2, 11):
kmeans = KMeans(n_clusters=k, random_state=42)
kmeans.fit(data_pca)
score = silhouette_score(data_pca, kmeans.labels_)
silhouette_scores.append(score)
plt.figure(figsize=(10, 6))
plt.plot(range(2, 11), silhouette_scores, marker='o')
plt.title('Оценка коэффициента силуэта')
plt.xlabel('Количество кластеров')
plt.ylabel('Коэффициент силуэта')
plt.show()
In [20]:
# Неиерархический алгоритм: k-means
optimal_k = 3 # Предположим, что оптимальное количество кластеров равно 3
kmeans = KMeans(n_clusters=optimal_k, random_state=42)
kmeans_labels = kmeans.fit_predict(data_pca)
# Иерархический алгоритм: агломеративный
agglomerative = AgglomerativeClustering(n_clusters=optimal_k)
agglomerative_labels = agglomerative.fit_predict(data_pca)
# Визуализация результатов
plt.figure(figsize=(15, 6))
plt.subplot(1, 2, 1)
plt.scatter(data_pca[:, 0], data_pca[:, 1], c=kmeans_labels, cmap='viridis', alpha=0.5)
plt.title('k-means')
plt.xlabel('Главная компонента 1')
plt.ylabel('Главная компонента 2')
plt.subplot(1, 2, 2)
plt.scatter(data_pca[:, 0], data_pca[:, 1], c=agglomerative_labels, cmap='viridis', alpha=0.5)
plt.title('Агломеративный')
plt.xlabel('Главная компонента 1')
plt.ylabel('Главная компонента 2')
plt.show()
In [15]:
# Оценка качества k-means
kmeans_inertia = kmeans.inertia_
kmeans_silhouette = silhouette_score(data_pca, kmeans_labels)
# Оценка качества агломеративной кластеризации
agglomerative_silhouette = silhouette_score(data_pca, agglomerative_labels)
print(f'k-means - Инерция: {kmeans_inertia}, Коэффициент силуэта: {kmeans_silhouette}')
print(f'Агломеративный - Коэффициент силуэта: {agglomerative_silhouette}')