machine learning12 - Decision Tree.py

# -*- coding: utf-8 -*-
"""
Created on June  18  2022

@author: Yunus GÜMÜŞSOY
"""

#1.kutuphaneler
import numpy as np
import matplotlib.pyplot as plt
import pandas as pd

#2.veri onisleme
#2.1.veri yukleme
veriler = pd.read_csv('veriler.csv')
#pd.read_csv("veriler.csv")
#test
print(veriler)


x = veriler.iloc[:,1:4].values #bağımsız değişkenler
y = veriler.iloc[:,4:].values #bağımlı değişken
print(y)


#verilerin egitim ve test icin bolunmesi
from sklearn.model_selection import train_test_split

x_train, x_test, y_train, y_test = train_test_split(x, y, test_size=0.33, random_state=0)


#verilerin olceklenmesi
from sklearn.preprocessing import StandardScaler

sc=StandardScaler()

# fit eğitim
X_train = sc.fit_transform(x_train)
# transform uygulama
X_test = sc.transform(x_test)


from sklearn.linear_model import LogisticRegression
logr = LogisticRegression(random_state=0)
logr.fit(X_train,y_train)

y_pred = logr.predict(X_test)
print(y_pred)
print(y_test)

# Confusion Matrix
# Karmaşıklık matrisi
from sklearn.metrics import confusion_matrix
cm = confusion_matrix(y_test,y_pred)
print(cm)

# K Nearest Neighborhood
from sklearn.neighbors import KNeighborsClassifier

knn = KNeighborsClassifier(n_neighbors=1, metric = 'minkowski') 
# komşu sayısını değiştirerek deneyebiliriz, bu örnekte az komşu ile daha başarılı tahminler oldu
# knn = KNeighborsClassifier(n_neighbors=5, metric = 'minkowski')
knn.fit(X_train, y_train)

y_pred = knn.predict(X_test)

cm = confusion_matrix(y_test, y_pred)
print (cm)

# Support Vector Machines
from sklearn.svm import SVC
svc = SVC(kernel='poly') # linear, rbf, sigmoid
svc.fit(X_train,y_train)

y_pred = svc.predict(X_test)

cm = confusion_matrix(y_test,y_pred)
print('SVC')
print(cm)


# Naive Bayes
from sklearn.naive_bayes import GaussianNB
gnb = GaussianNB()
gnb.fit(X_train, y_train)

y_pred = gnb.predict(X_test)

cm = confusion_matrix(y_test,y_pred)
print('GNB')
print(cm)


# Decision Tree
from sklearn.tree import DecisionTreeClassifier
dtc = DecisionTreeClassifier(criterion = 'entropy') # Gini
dtc.fit(X_train,y_train)

y_pred = dtc.predict(X_test)

cm = confusion_matrix(y_test,y_pred)
print('DTC')
print(cm)