Top "Classification" questions

In machine learning and statistics, classification is the problem of identifying which of a set of categories a new observation belongs to, on the basis of a training set of data containing observations whose category membership (label) is known.

Understanding concept of Gaussian Mixture Models

I'm trying to understand GMM by reading the sources available online. I have achieved clustering using K-Means and was seeing …

matlab machine-learning classification cluster-analysis mixture-model
Multinomial Naive Bayes parameter alpha setting? scikit-learn

Does any one know how to set parameter of alpha when doing naive bayes classification? E.g. I used bag …

python scikit-learn classification naivebayes
Scikit-learn confusion matrix

I can't figure out if I've setup my binary classification problem correctly. I labeled the positive class 1 and the negative 0. …

python machine-learning scikit-learn classification
What is weakly supervised learning (bootstrapping)?

I understand the differences between supervised and unsupervised learning: Supervised Learning is a way of "teaching" the classifier, using labeled …

machine-learning classification
How to implement decision tree with c# (visual studio 2008) - Help

I have a decision tree that i need to turn to a code in C# The simple way of doing …

c# .net classification decision-tree
kNN: training, testing, and validation

I am extracting image features from 10 classes with 1000 images each. Since there are 50 features that I can extract, I am …

machine-learning computational-geometry classification knn
Difference between glmnet() and cv.glmnet() in R?

I'm working on a project that would show the potential influence a group of events have on an outcome. I'm …

r classification glm cross-validation glmnet
Dealing with unbalanced datasets in Spark MLlib

I'm working on a particular binary classification problem with a highly unbalanced dataset, and I was wondering if anyone has …

apache-spark machine-learning classification apache-spark-mllib
Retraining after Cross Validation with libsvm

I know that Cross validation is used for selecting good parameters. After finding them, i need to re-train the whole …

matlab machine-learning classification svm libsvm
confusion matrix from rpart

I can't for the life of me figure out how to compute a confusion matrix on rpart. Here is what …

r machine-learning classification decision-tree confusion-matrix