Top ML Algorithms For Data Scientists.

DATA SCIENCE

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Principal Component Analysis

The Covariance Matrix of data points is analyzed here to understand what dimensions(mostly)/ data points (sometimes) are more important.

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Least Squares and Polynomial Fitting

If you have used Numerical Analysis code in college, you can use them to fit curves in Machine Learning for very small datasets with low dimensions.

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K means Clustering

The input the algorithm has taken is the number of clusters that are to be generated and the number of iterations in which it will try to converge clusters.

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Logistic Regression

Logistic Regression is trained using optimization methods like Gradient Descent or L-BFGS. NLP people will often use it with the name of Maximum Entropy Classifier.

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Support Vector Machines

You can optimize the loss function using optimization methods like L-BFGS or even SGD. Another innovation in SVMs is the usage of kernels on data to feature engineers.

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Feedforward Neural Networks

These are basically multilayered Logistic Regression classifiers. FFNNs can be used for classification and unsupervised feature learning as autoencoders.

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Convolutional Neural Networks

Almost any state-of-the-art Vision-based Machine Learning result in the world today has been achieved using Convolutional Neural Networks.

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Recurrent Neural Networks

Pure RNNs are rarely used now but their counterparts like LSTMs and GRUs are state of the art in most sequence modeling tasks.

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Conditional Random Fields

CRF models each element of the sequence such that neighbors affect a label of a component in a sequence instead of all labels being independent of each other.

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Decision Trees

Earlier versions like CART trees were once used for simple data, but with a bigger and larger datasets, the bias-variance tradeoff needs to be solved with better algorithms.

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