Classification 코드 정리

라이브러리 불러오기

import seaborn as sns
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
from sklearn.datasets import load_breast_cancer
from sklearn.model_selection import train_test_split
from datetime import datetime
from sklearn.linear_model import LogisticRegression
from sklearn.tree import DecisionTreeClassifier
from sklearn.ensemble import RandomForestClassifier, AdaBoostClassifier, GradientBoostingClassifier
from lightgbm import LGBMClassifier
from xgboost import XGBClassifier
from sklearn.neighbors import KNeighborsClassifier
from sklearn.neural_network import MLPClassifier
from sklearn.metrics import precision_score, recall_score, f1_score, accuracy_score, confusion_matrix

 

유틸 함수 추가하기

def get_validation(y_test, y_pred):
    matrix = confusion_matrix(y_test, y_pred).tolist()
    return {
        "accuracy": round(accuracy_score(y_test, y_pred), 2),
        "TP": str(matrix[0][0]),
        "FP": str(matrix[0][1]),
        "precision_0": round(precision_score(y_test, y_pred, pos_label=0), 2),
        "recall_0": round(recall_score(y_test, y_pred, pos_label=0), 2),
        "f1score_0": round(f1_score(y_test, y_pred, pos_label=0), 2),
        "TN": str(matrix[1][1]),
        "FN": str(matrix[1][0]),
        "precision_1": round(precision_score(y_test, y_pred, pos_label=1), 2),
        "recall_1": round(recall_score(y_test, y_pred, pos_label=1), 2),
        "f1score_1": round(f1_score(y_test, y_pred, pos_label=1), 2),
    }

from io import StringIO
from google.colab import output

io = StringIO()

def autosave_print(*text):
    output.clear()
    print(*text, file=io)
    print(io.getvalue(), end="")

def clear_print():
    io.seek(0)
    io.truncate(0)

def clear_output():
    output.clear()

 

데이터 불러오기

data = load_breast_cancer()

df_cancer = pd.DataFrame(data=data.data, columns=data.feature_names)
df_cancer['target'] = data.target
df_cancer.info()

df_cancer.head()

df_cancer.target.value_counts()

 

데이터 시각화하기

cols_size = len(df_cancer.columns)

plt.figure(figsize=(15, 30))

for i, column in enumerate(df_cancer.columns):
    ax = plt.subplot(cols_size // 4 + 1, 4, i+1)
    label_size = len(df_cancer[column].unique())
    if label_size < 10:
    sns.countplot(x=column, hue='target', data=df_cancer, ax=ax)
    plt.title(column)
    plt.xlabel("")
    plt.ylabel("")
    ax.get_legend().remove()
    else:
    sns.violinplot(x='target', y=column, data=df_cancer, ax=ax)
    plt.title(column)
    plt.xlabel("")
    plt.ylabel("")

 

상관계수 출력하기

df_cancer.corr()[['target']].sort_values(by='target', key=abs, ascending=False)

 

Train, Test 데이터 분리하기

X = df_cancer.iloc[:, :-1]
y = df_cancer.iloc[:, -1]
print(X.shape, y.shape)

X_train, X_test, y_train, y_test = train_test_split(X, y, stratify=y, train_size=0.2, random_state=2045)
print("Train Size:", X_train.shape, y_train.shape)
print("Test Size:", X_test.shape, y_test.shape)

print("# Train")
print(y_train.value_counts() / y_train.shape[0])
print("# Test")
print(y_test.value_counts() / y_test.shape[0])

 

모델별 학습하기

%%time

clear_print()

grap_time = datetime.now()
model_lr = LogisticRegression(n_jobs=-1, verbose=3, random_state=2045)
model_lr.fit(X_train, y_train)
autosave_print("LogisticRegression", datetime.now() - grap_time)

grap_time = datetime.now()
model_dt = DecisionTreeClassifier(random_state=2045)
model_dt.fit(X_train, y_train)
autosave_print("DecisionTreeClassifier", datetime.now() - grap_time)

grap_time = datetime.now()
model_random = RandomForestClassifier(n_jobs=-1, verbose=3, random_state=2045)
model_random.fit(X_train, y_train)
autosave_print("RandomForestClassifier", datetime.now() - grap_time)

grap_time = datetime.now()
model_ada = AdaBoostClassifier(random_state=2045)
model_ada.fit(X_train, y_train)
autosave_print("AdaBoostClassifier", datetime.now() - grap_time)

grap_time = datetime.now()
model_gbm = GradientBoostingClassifier(verbose=3, random_state=2045)
model_gbm.fit(X_train, y_train)
autosave_print("GradientBoostingClassifier", datetime.now() - grap_time)

grap_time = datetime.now()
model_lgbm = LGBMClassifier(n_jobs=-1, random_state=2045)
model_lgbm.fit(X_train, y_train)
autosave_print("LGBMClassifier", datetime.now() - grap_time)

grap_time = datetime.now()
model_xgbm = XGBClassifier(n_jobs=-1, random_state=2045)
model_xgbm.fit(X_train, y_train)
autosave_print("XGBClassifier", datetime.now() - grap_time)

grap_time = datetime.now()
model_kn = KNeighborsClassifier(n_jobs=-1)
model_kn.fit(X_train, y_train)
autosave_print("KNeighborsClassifier", datetime.now() - grap_time)

 

모델별 학습 결과 평가하기

validations = {}

y_pred_lr = model_lr.predict(X_test)
validations["logistic_regression"] = get_validation(y_test, y_pred_lr)

y_pred_dt = model_dt.predict(X_test)
validations["decision_tree"] = get_validation(y_test, y_pred_dt)

y_pred_random = model_random.predict(X_test)
validations["random_forest"] = get_validation(y_test, y_pred_random)

y_pred_ada = model_ada.predict(X_test)
validations["ada_boosting"] = get_validation(y_test, y_pred_ada)

y_pred_gbm = model_gbm.predict(X_test)
validations["gradient_boosting"] = get_validation(y_test, y_pred_gbm)

y_pred_lgbm = model_lgbm.predict(X_test)
validations["light_gbm"] = get_validation(y_test, y_pred_lgbm)

y_pred_xgbm = model_xgbm.predict(X_test)
validations["extra_gbm"] = get_validation(y_test, y_pred_xgbm)

y_pred_kn = model_kn.predict(X_test)
validations["k_neighbor"] = get_validation(y_test, y_pred_kn)

df = pd.DataFrame(validations).transpose()
df.style.background_gradient(subset=['TP', 'TN'], cmap='BuGn')