Questions tagged [train]

training (or estimation) of statistical models or algorithms.

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1answer
4k views

Can a neural network output represent a posterior probability?

I seem to remember from years ago when I first read Bishop's ANN book that it is possible to construct a neural network such that the outputs should represent the posterior probability that I would ...
8
votes
6answers
9k views

Is using the same data for feature selection and cross-validation biased or not?

We have a small dataset (about 250 samples * 100 features) on which we want to build a binary classifier after selecting the best feature subset. Lets say that we partition the data into: Training, ...
1
vote
1answer
1k views

Machine Learning and training time: is it really relevant?

I have a question regarding the time needed for training a classifier. I am facing the specific problem of Sentiment Analysis (classification of text as pos/neg/neu). (Excepting online learning ...
10
votes
3answers
410 views

Approaches when learning from huge datasets?

Basically, there are two common ways to learn against huge datasets (when you're confronted by time/space restrictions): Cheating :) - use just a "manageable" subset for training. The loss of ...