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Learning Vector Quantization for Machine Learning - Machine Learning Mastery


A downside of K-Nearest Neighbors is that you need to hang on to your entire training dataset. The Learning Vector Quantization algorithm (or LVQ for short) is an artificial neural network algorithm that lets you choose how many training instances to hang onto and learns exactly what those instances should look like. In this post you will discover the Learning Vector Quantization algorithm. This post was written for developers and assumes no background in statistics or mathematics. The post focuses on how the algorithm works and how to use it for predictive modeling problems.

How To Implement Learning Vector Quantization From Scratch With Python - Machine Learning Mastery


The Learning Vector Quantization (LVQ) algorithm is a lot like k-Nearest Neighbors. Predictions are made by finding the best match among a library of patterns. The difference is that the library of patterns is learned from training data, rather than using the training patterns themselves. The library of patterns are called codebook vectors and each pattern is called a codebook. The codebook vectors are initialized to randomly selected values from the training dataset.

Cross validation Deep learning


It seems to me, that above definition of k-folded cross validation algorithm (from Deep Learning book by Ian Goodfellow and Yoshua Bengio and Aaron Courville, 2016) is inconsistent with the common definition of cross - validation. In above algorithm $e$ vector is the vector of loss function calculated for every particular example in the $D$ dataset, and then mean of vector $e$ is the estimation of generalization error. Whereas in standard definition of cross - validation, we calculate test error for each fold and then calculate average of them.

How to Prepare Text Data for Machine Learning with scikit-learn - Machine Learning Mastery


Text data requires special preparation before you can start using it for predictive modeling. The text must be parsed to remove words, called tokenization. Then the words need to be encoded as integers or floating point values for use as input to a machine learning algorithm, called feature extraction (or vectorization). The scikit-learn library offers easy-to-use tools to perform both tokenization and feature extraction of your text data. In this tutorial, you will discover exactly how you can prepare your text data for predictive modeling in Python with scikit-learn.

Support Vector Machine Classification in Python


Support Vector Machine (SVM) is a supervised machine learning algorithm capable of performing classification, regression and even outlier detection. The linear SVM classifier works by drawing a straight line between two classes. This type of algorithm classifies output data and makes predictions. The output of this model is a set of visualized scattered plots separated with a straight line. You will learn the fundamental theory and practical illustrations behind Support Vector Machines and learn to fit, examine, and utilize supervised Classification models using SVM to classify data, using Python.