ID3 - Python Code

 import pandas as pd

import matplotlib.pyplot as plt

from sklearn import tree

from sklearn.tree import DecisionTreeClassifier

from sklearn.model_selection import train_test_split

from sklearn.metrics import accuracy_score


data = {

    'Outlook': ['Sunny', 'Sunny', 'Overcast', 'Rain', 'Rain', 'Rain', 'Overcast',

                'Sunny', 'Sunny', 'Rain', 'Sunny', 'Overcast', 'Overcast', 'Rain'],

    'Temperature': ['Hot', 'Hot', 'Hot', 'Mild', 'Cool', 'Cool', 'Cool',

                    'Mild', 'Cool', 'Mild', 'Mild', 'Mild', 'Hot', 'Mild'],

    'Humidity': ['High', 'High', 'High', 'High', 'Normal', 'Normal', 'Normal',

                 'High', 'Normal', 'Normal', 'Normal', 'High', 'Normal', 'High'],

    'Windy': [False, True, False, False, False, True, True,

              False, False, False, True, True, False, True],

    'PlayTennis': ['No', 'No', 'Yes', 'Yes', 'Yes', 'No', 'Yes',

                   'No', 'Yes', 'Yes', 'Yes', 'Yes', 'Yes', 'No']

}


df=pd.DataFrame(data)


df_encoded=pd.get_dummies(df[['Outlook','Temperature','Humidity','Windy']])

target=df['PlayTennis']


X_train,X_test,y_train,y_test=train_test_split(df_encoded,target,test_size=0.2,random_state=42)


model=DecisionTreeClassifier(criterion='entropy')


model.fit(X_train,y_train)


y_pred=model.predict(X_test)


print("Accuracy:", accuracy_score(y_test,y_pred))


plt.figure(figsize=(15,10))

tree.plot_tree(model, feature_names=X_train.columns,class_names=model.classes_,filled=True)

plt.show()

Comments

Post a Comment

Popular posts from this blog

HSDPA (High-Speed Downlink Packet Access)

Image
HSDPA, short for High-Speed Downlink Packet Access, is a new protocol for mobile telephone data transmision. It is known as a 3.5G technology. This standard will provide download speed on a mobile device equivalant to ADSL(Asymmetric Digital Subscriber Line) line in a home. HSDPA is an evolution or improvement on W-CDMA (Wideband Code Division Multiple Access), a 3G protocol. HSDPA improves the data tranfer rate by a factor of at least five over W-CDMA. Theoretical data transmission speed of HSDPA is 8 to 10 Mbps. HSDPA provide higher data transfer speeds and capacity with networks based on Universal Mobile Telecommunications System (UMTS). In India any BSNL(Bharat Sanchar Nigam Ltd) 3G coverage area, the network is based on UMTS and it support HSDPA. For HSDPA, a new transport layer channel, High-Speed Downlink Shared Channel (HS-DSCH), has been added to W-CDMA. It is implemented by adding three new physical layer channels: (i) HS-SCCH (High Speed-Shared Control Channel) (ii) HS-DPCCH...
Read more

Perceptron for AND Gate - Python Code

 import numpy as np def step(x):     return 1 if x>=0 else 0 def train(X,y):     w=np.zeros(X.shape[1])     b=0     for _ in range(5):         print(f'Epoch : {_}')         for i in range(len(X)):             z=np.dot(X[i],w)+b             y_pred=step(z)             error=y[i]-y_pred             w+=error*X[i]             b+=error         print(f'Weights : {w}, Bias : {b}')     return w,b def predict(X,w,b):     return [step(np.dot(x,w)+b) for x in X]  X=np.array([[0,0], [0,1], [1,0], [1,1]]) y=np.array([0,0,0,1]) w,b=train(X,y) print("Prediction:", predict(X,w,b))
Read more

Random Forest - Python Code

 import pandas as pd from sklearn.ensemble import RandomForestClassifier from sklearn.model_selection import train_test_split from sklearn.metrics import accuracy_score,classification_report data = {     'CGPA': ['>=9', '<9', '>=9', '<9', '>=9'],     'Interactivity': ['Yes', 'No', 'No', 'No', 'Yes'],     'Comm': ['Good', 'Moderate', 'Moderate', 'Moderate', 'Moderate'],     'Practical': ['Good', 'Good', 'Average', 'Average', 'Average'],     'JobOffer': ['Yes', 'No', 'Yes', 'No', 'Yes'] } df=pd.DataFrame(data) df.replace({'>=9':1,'<9':0,'Yes':1,'No':0,'Good':1,'Moderate':0,'Average':0},inplace=True) X=df.drop('JobOffer',axis=1) y=df['JobOffer'] X_train,X_test,y...
Read more