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What Are Common Algorithms Used in Machine Learning?
Machine Learning (ML) is a powerful branch of Artificial Intelligence that enables computers to learn from data and make decisions without being explicitly programmed. One of the foundational aspects of ML is the algorithms that power its models. These algorithms serve as the blueprint for identifying patterns, making predictions, and solving problems across a range of industries—from healthcare to finance to retail.
In this article, we’ll explore some of the most common algorithms used in Machine Learning, categorized by the type of learning they support: supervised, unsupervised, and reinforcement learning.
1. Supervised Learning Algorithms
Supervised learning involves training a model on a labeled dataset, which means the input comes with the correct output. The goal is to learn a mapping from inputs to outputs.
a. Linear Regression
Linear regression is used for predicting a continuous value. It assumes a linear relationship between input features and the target variable. For example, predicting housing prices based on size and location.
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... b. Logistic Regression
Despite its name, logistic regression is used for classification problems. It estimates the probability that an input belongs to a certain class and is commonly used in binary classification Artificial Intelligence Online Course (e.g., spam detection).
c. Decision Trees
Decision trees split data into branches to make decisions. They are easy to interpret and used for both classification and regression tasks. However, they can overfit, especially with deep trees.
d. Random Forest
Random Forest is an ensemble method that builds multiple decision trees and merges them to get more accurate and stable predictions. It reduces overfitting and handles missing values well.
e. Support Vector Machines (SVM)
SVMs find the hyperplane that best separates classes in a dataset. They work well in high-dimensional spaces and are effective for complex, non-linear boundaries with the use of kernel functions.
f. k-Nearest Neighbors (k-NN)
This algorithm classifies data based on the majority label among the k closest points in the training set. It’s simple and effective but computationally expensive with large datasets Artificial Intelligence Online Training.
2. Unsupervised Learning Algorithms
Unsupervised learning deals with unlabeled data. The model tries to learn the structure or distribution in the data.
a. K-Means Clustering
K-Means partitions the data into k clusters where each data point belongs to the cluster with the nearest mean. It’s widely used in market segmentation and image compression.
b. Hierarchical Clustering
Unlike K-Means, hierarchical clustering builds a tree of clusters and doesn’t require specifying the number of clusters beforehand. It’s useful for hierarchical data representations.
c. Principal Component Analysis (PCA)
PCA is a dimensionality reduction technique that transforms data into a new coordinate system, reducing the number of variables while retaining the most variance. Artificial Intelligence Training It’s used in preprocessing and visualization.
3. Reinforcement Learning Algorithms
Reinforcement learning involves an agent interacting with an environment to maximize a reward over time.
a. Q-Learning
Q-learning is a value-based algorithm where the agent learns the quality of actions, telling it what action to take under what circumstances. It’s commonly used in game-playing and robotics.
b. Deep Q-Networks (DQN)
An advanced version of Q-learning that uses deep neural networks to approximate the Q-values. DQNs have been famously used by DeepMind to master Atari games.
Conclusion
Understanding the common algorithms used in Machine Learning is essential for anyone pursuing a career in data science or AI. These algorithms form the backbone of countless applications, from predictive analytics and natural language processing to recommendation systems and autonomous vehicles. Whether you're learning through an Artificial Intelligence Online Course or hands-on projects, mastering these algorithms will equip you with the tools to build intelligent systems that solve real-world problems.
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