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k means clustering algorithm in machine learning
Machine Learning

A simple guide to k-Means Clustering with scikit-learn

An unsupervised machine learning method for classifying data into clusters is called k-means clustering. Each data point will be allocated to the cluster with the closest mean after a set of data points has been divided into K clusters. The iterative method aims to minimize the total squared distances between each assigned data point and the cluster centroid. Here’s how to create the K-means clustering algorithm in Python:

k means clustering algorithm in machine learning

K-Means Clustering Algorithm in Python:

Import the necessary libraries first:

import numpy as np
import matplotlib.pyplot as plt
from sklearn.datasets import make_blobs
from sklearn.cluster import KMeans

Generating the sample data or loading a local dataset is the second step. As an example, let’s generate some artificial data using make_blobs from sklearn.datasets:

# Generate synthetic data with 4 clusters
X, _ = make_blobs(n_samples=300, centers=4, cluster_std=1.0, random_state=42)

Next, utilize K-Means Clustering:

# Define the number of clusters (K)
k = 4

# Initialize the KMeans object
kmeans = KMeans(n_clusters=k)

# Fit the model to the data

# Get the cluster assignments and cluster centers
cluster_labels = kmeans.labels_
cluster_centers = kmeans.cluster_centers_

For the clusters’ visual representation:

# Plot the data points and cluster centers
plt.scatter(X[:, 0], X[:, 1], c=cluster_labels, cmap='viridis', edgecolors='k')
plt.scatter(cluster_centers[:, 0], cluster_centers[:, 1], marker='x', s=200, c='red', label='Cluster Centers')
plt.xlabel('Feature 1')
plt.ylabel('Feature 2')
plt.title('K-means Clustering')

The data points will be plotted with colors corresponding to the clusters to which they have been assigned, and the cluster centers will be indicated by red “x” markers.
It is significant to remember that the algorithm’s performance may be affected by the choice of the number of clusters (K). Also, it may be necessary to experiment with different K values in order to find the best clustering solution for your dataset. The optimal K can be determined using the “Elbow Method” or other clustering evaluation metrics.

For real-world datasets, it’s also essential to manage any missing values and preprocess the data. The Scaling or normalization of features may be necessary during clustering to guarantee equitable comparisons between different features. Since we used simple synthetic data, these preprocessing steps are not required in this case.


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