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.

ERROR While using WEKA API in java code: Class Attribute Not Set?

I'm trying to use weka API in my java code. I use J48 tree classification to Classify my dataset in …

java api classification weka
How to set a threshold for a sklearn classifier based on ROC results?

I trained an ExtraTreesClassifier (gini index) using scikit-learn and it suits my needs fairly. Not so good accuracy, but using …

python scikit-learn classification threshold roc
Why vector normalization can improve the accuracy of clustering and classification?

It is described in Mahout in Action that normalization can slightly improve the accuracy. Can anyone explain the reason, thanks!

machine-learning nlp classification mahout
Learning Weka on the Command Line

I am fairly new to Weka and even more new to Weka on the command line. I find documentation is …

machine-learning classification weka
Recommended anomaly detection technique for simple, one-dimensional scenario?

I have a scenario where I have several thousand instances of data. The data itself is represented as a single …

machine-learning classification
Supervised Latent Dirichlet Allocation for Document Classification?

I have a bunch of already human-classified documents in some groups. Is there a modified version of lda which I …

machine-learning nlp classification document-classification lda
Using Artificial Intelligence (AI) to predict Stock Prices

Given a set of data very similar to the Motley Fool CAPS system, where individual users enter BUY and SELL …

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Difference between logistic regression and softmax regression

I know that logistic regression is for binary classification and softmax regression for multi-class problem. Would it be any differences …

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What is the difference between OneVsRestClassifier and MultiOutputClassifier in scikit learn?

Can someone please explain (with example maybe) what is the difference between OneVsRestClassifier and MultiOutputClassifier in scikit-learn? I've read documentation …

python scikit-learn classification multilabel-classification multiclass-classification
sklearn logistic regression with unbalanced classes

I'm solving a classification problem with sklearn's logistic regression in python. My problem is a general/generic one. I have …

python scikit-learn classification