# Data Science Algorithms

Machine learning and artificial intelligence have revolutionized all aspects of data science. Machine learning algorithms are the building blocks of modern data science applications. Many kinds of algorithms are being used in data science, for example, machine learning algorithms, data processing algorithms, data manipulation algorithms, and optimization algorithms. Gradient Descent, Newton’s method, and Least-Squares are examples of optimization algorithms, and they are primarily used to estimate various parameters.

## Machine Learning in Data Science

Machine learning is useful for finding patterns in the data. It is particularly good at classification, categorization, prediction, and projection from datasets. Most of the machine learning algorithms use error minimization techniques to generate results from the data. The most important algorithms are neural networks, Support Vector Machine (SVM), K-Nearest-Neighbor (KNN), Bayes algorithm, logistic regression, and so on. The models are trained by the algorithms mentioned above to produce results with optimal accuracy. There are two approaches to use machine learning for data science. One is supervised learning, and the other is unsupervised learning. In supervised learning, the dataset is in an organized form, and the predefined desired outcomes can validate the results of the algorithm. In unsupervised learning, the dataset is in a raw form. In this process, the raw data is first organized using various clustering techniques.

## Important Data Science Algorithms

The important data science algorithms are linear and logistic regression, clustering, ensemble methods, classification, nearest neighbor, decision trees, neural networks, random forests, etc.

### Clustering

It is an unsupervised algorithm of machine learning. It divides the data into groups called clusters. The raw data is fed to the model, and the algorithms find different patterns in the data and classify that data into several categories or classes. These classes are then labeled distinctively. K-means is a common clustering algorithm.

### Classification

It is the next step after clustering. Previously unseen data is fed to the classification model. The model already has a set number of categories. The input data is classified into predefined categories. Regression is a typical example of classification.

### Regression

It is the process of identifying the relationship between different data variables. Based on this relationship, an approximate mathematical model is created. A trained regression model can perform prediction for unseen input data. There are various kinds of regression types. Linear regression is used when a straight line defines the relationship between the input and output. Logistic regression is used when the outcome of the input is in the form of a probabilistic value.

### Nearest Neighbor

It is one of the simplest machine learning algorithms. It is a kind of instance-based training. In this algorithm, a point is selected from the dataset. The relationship of this point is defined concerning other points based on the distance between them. It is used for regression and classification.

### Decision Trees

A decision tree is a graphical representation based on certain conditions of all possible solutions to a decision. It is known as a decision tree because it begins with a single root, which, much like a tree, then branches off into a variety of solutions.

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