K Nearest Neighbor Classification Algorithm Explain with Project

In this ML Algorithms course tutorial, we are going to learn “ K Nearest Neighbor Classification in detail. we covered it by practically and theoretical intuition.

1. What is K Nearest Neighbor?
2. What does the K stand for in K nearest neighbors?
3. What is K Nearest Neighbor used for?
4. How do K Nearest Neighbor work?
5. What is K Nearest Neighbor Classification?
6. What is Euclidian Distance Manhattan Distance?
7. What is nearest Neighbour rule?
8. What is K Nearest Neighbor Classification diagram?
9. How to implement K Nearest Neighbor Classification in python using sklearn?

K Nearest Neighbor Classification (KNN) Project

# -*- coding: utf-8 -*-
"""K Nearest Neighbor Classification.ipynb

Automatically generated by Colaboratory.

Original file is located at
    https://colab.research.google.com/drive/1MgSgP5NhZjoyX3vQSXpd_hq2GFqD4hbp

# K Nearest Neighbor Classification

### Import Libraries
"""

# import libraries
import numpy as np
import pandas as pd

"""### Load Dataset"""

#load dataset
from sklearn.datasets import load_breast_cancer
data = load_breast_cancer()

data.data

data.feature_names

data.target

data.target_names

# create dtaframe
df = pd.DataFrame(np.c_[data.data, data.target], columns=[list(data.feature_names)+['target']])
df.head()

df.tail()

df.shape

"""### Split Data"""

X = df.iloc[:, 0:-1]
y = df.iloc[:, -1]

from sklearn.model_selection import train_test_split
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=2020)

print('Shape of X_train = ', X_train.shape)
print('Shape of y_train = ', y_train.shape)
print('Shape of X_test = ', X_test.shape)
print('Shape of y_test = ', y_test.shape)

"""## Train K Nearest Neighbo[link text](https://)r Classification Model

> Indented block
"""

from sklearn.neighbors import KNeighborsClassifier

classifier = KNeighborsClassifier(n_neighbors=5)
classifier.fit(X_train, y_train)

classifier.score(X_test, y_test)

"""## Predict Cancer"""

patient1 = [17.99,
 10.38,
 122.8,
 1001.0,
 0.1184,
 0.2776,
 0.3001,
 0.1471,
 0.2419,
 0.07871,
 1.095,
 0.9053,
 8.589,
 153.4,
 0.006399,
 0.04904,
 0.05373,
 0.01587,
 0.03003,
 0.006193,
 25.38,
 17.33,
 184.6,
 2019.0,
 0.1622,
 0.6656,
 0.7119,
 0.2654,
 0.4601,
 0.1189]

patient1 = np.array([patient1])

patient1

classifier.predict(patient1)

pred = classifier.predict(patient1)

if pred[0] == 0:
  print('Patient has Cancer (malignant tumor)')
else:
  print('Patient has no Cancer (malignant benign)')