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Heart Disease Prediction using ANN

  • Difficulty Level : Medium
  • Last Updated : 11 May, 2020

Deep Learning is a technology of which mimics a human brain in the sense that it consists of multiple neurons with multiple layers like a human brain. The network so formed consists of an input layer, an output layer, and one or more hidden layers. The network tries to learn from the data that is fed into it and then performs predictions accordingly. The most basic type of neural network is the ANN (Artificial Neural Network). The ANN does not have any special structure, it just comprises of multiple neural layers to be used for prediction.
Let’s build a model that predicts whether a person has heart disease or not by using ANN.

About the data:
In the dataset, we have 13 columns in which we are given different attributes such as sex, age, cholesterol level, etc. and we are given a target column which tells us whether that person has heart disease or not. We will keep all the columns as independent variables other than the target column because it will be our dependent variable. We will build an ANN which will predict whether a person has heart disease or not given other attributes of the person.

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You can find the dataset here heart disease dataset



Code: Importing Libraries




import tensorflow as tf
import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
import keras
from keras.models import Sequential
from keras.layers import Dense
from sklearn.metrics import confusion_matrix

Code: Importing Dataset




data = pd.read_csv('heart.csv')
data.head()

Data Description:




data.describe()

Code: Check for null values




data.isnull().any()


Assign Dependent and Independent variable




X = data.iloc[:,:13].values
y = data["target"].values



Code : Split data into Train and Test dataset




X_train,X_test,y_train, y_test = train_test_split(X,y,test_size = 0.3 , random_state = 0 )

Code: Scale the data.




from sklearn.preprocessing import StandardScaler
sc = StandardScaler()
X_train = sc.fit_transform(X_train)
X_test = sc.transform(X_test)


Code: Building the Model




classifier = Sequential()
classifier.add(Dense(activation = "relu", input_dim = 13
                     units = 8, kernel_initializer = "uniform"))
classifier.add(Dense(activation = "relu", units = 14
                     kernel_initializer = "uniform"))
classifier.add(Dense(activation = "sigmoid", units = 1
                     kernel_initializer = "uniform"))
classifier.compile(optimizer = 'adam' , loss = 'binary_crossentropy'
                   metrics = ['accuracy'] )

Code : Fitting the Model




classifier.fit(X_train , y_train , batch_size = 8 ,epochs = 100  )


Code : Performing prediction and rescaling




y_pred = classifier.predict(X_test)
y_pred = (y_pred > 0.5)

Code: Confusion Matrix




cm = confusion_matrix(y_test,y_pred)
cm

Code: Accuracy




accuracy = (cm[0][0]+cm[1][1])/(cm[0][1] + cm[1][0] +cm[0][0] +cm[1][1])
print(accuracy*100)


We will get accuracy approximately around 85%.




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