Eric Nunes

7 Questions 35 Answers 0 Followers

Questions related from Eric Nunes

Can I using semi-supervised methods to classify data?

After reading a lot of semi-supervised methods, the way these methods work is by training a small labeled data, then predicting the labels of the unlabeled points incrementally. So if I want to...

04 April 2014 9,095 1 View

Is the semi-supervised technique "Co-training" similar to random forest?

I was going over the Co-training technique, which is a widely used semi-supervised method, where you look at the data in two views (split it into two uncorrelated feature sets) and then learn the...

04 April 2014 5,934 4 View

Importing a pointer with all the data that it points to from C++ to Matlab via mex?

I am working on a classification algorithm, for which I am training a decision tree in C++, via the mexFunction. I am storing all the nodes of the tree with their respective data points, each node...

11 November 2013 9,362 7 View

Which are some of the benchmark datasets used to test object classification algorithms?

I am testing a supervised classification algorithm and then comparing it with SVM and KNN. I tested the algorithm using Caltech-256 dataset. I wanted to know which are the commonly-used datasets...

08 August 2013 7,034 1 View

What is the best feature selection method based on information gain in terms of less computational cost for high dimensional feature vector?

I am doing classification experiments using high dimensional feature vectors, which looks like a sparse vector , having a lot of uninformative and correlated features. I am using a random forest...

08 August 2013 6,670 3 View

Threshold values for ROC curves in Random forest?

I am implementing an unsupervised classification on data using Random forest and using KNN as the clustering method at each node. (this is a multi-class classification problem) I know that a...

06 June 2013 1,561 5 View

Is it possible to plot a ROC curve for a multiclass classification algorithm to study its performance, or is it better to analyze by confusion matrix?

I have a a multiclass data-set , which I am analyzing using classification algorithms, but I am having difficultlies plotting the ROC curve. I searched through a lot of papers and sites but most...

06 June 2013 5,195 22 View