Given a trained contextual bandit model, how can I retrieve a prediction vector on test samples? For example, let's say I have a train set named "train.dat" containing lines formatted as below ...

I'm trying to write a data frame to a gzip file but having problems. Here's my code example: df1 <- data.frame(id = seq(1,10,1), var1 = runif(10), var2 = runif(10)) gz1 <- gzfile("df1.gz",...

I'm trying real hard to install vowpal wobbit and it fails when i run the make file, throwing: cd library; make; cd .. g++ -g -o ezexample temp2.cc -L ../vowpalwabbit -l vw -l allreduce -l boo...

Following the available docs and resources, it is not really clear how to accomplish a simple getting-started flow where you'd launch Vowpal Wabbit as a daemon (possibly even without any pre-...

I got a weird result from vw, which uses online learning scheme for logistic regression. And when I add --l1 or --l2 regularization then I got all predictions at 0.5 (that means all features are 0)...

I have a very basic question. I'd like to do low-rank matrix factorization and I was looking at the Vowpal Wabbit documentation on the topic. My question is: Is there a difference between these tw...

I'm starting Vowpal Wabbit in daemon mode with the following command: vw --loss_function hinge --ect 250 --quiet --passes 5 -b 25 --daemon --port 10001 --pid_file pidfile This works well and I'm ...

VW recently added a python interface, however I am having trouble finding instructions for how to install it. If I install VW from homebrew (brew install vowpal-wabbit) and I open python, and call ...

My goal is to do a grid search over various VW models in their parameter space (trying different loss functions and regularizations etc). Since the model could use multiple passes, I would like to ...

I am new to vowpal wabbit so have some questions about it. I passed a dataset to the vw and fit a model and got in-sample predictions, saved the model with -f. So far so good. I know how to use th...

Is there a way to use gradient boosting on regression using Vowpal Wabbit? I use various techniques that come with Vowpal Wabbit that are helpful. I want to try gradient boosting along with that, b...

I have the following data with all categorical variables: class education income social_standing 1 basic low good 0 low high V_good 1 high low not_good 0 v_high high good Here education has...

Hi have a Vowpal Wabbit file with two namespaces, for example: 1.0 |A snow |B ski:10 0.0 |A snow |B walk:10 1.0 |A clear |B walk:10 0.0 |A clear |B walk:5 1.0 |A clear |B walk:100 1.0 |A clear |B ...

I am performing logistic regression using Vowpal Wabbit on a dataset with 25 features and 48 million instances. I have a question on current predict values. Should it be within 0 or 1. average sin...

Below is part of the log from training my VW model. Why are some of these lines followed by h? You'll notice that's true of the "average loss" line in the summary at the end. I'm not sure what th...

What parameters should I use in VW for a binary classification task? For example, let's use rcv1_small.dat. I thought it is better to use the logistic loss function (or hinge) and it makes no sense...

Is there a way to send data to train a model in Vowpal Wabbit without writing it to disk? Here's what I'm trying to do. I have a relatively large dataset in csv (around 2gb) which fits in memory w...

I have started using Vowpal Wabbit for logistic regression, however I am unable to reproduce the results it gives. Perhaps there is some undocumented "magic" it does, but has anyone been able to re...

Is there anyway to compute AUC within Vowpal Wabbit? One of the reasons I am using Vowpal Wabbit is the large size of the data file. I can calculate the AUC outside of the Vowpal Wabbit environmen...

I'm trying to get a vowpal wabbit model saved with inverted hashes. I have a valid model produced with the following: vw --oaa 2 -b 24 -d mydata.vw --readable_model mymodel.readable which produce...

I am trying to use vowpal wabbit for logistic regression. I am not sure if this is the right syntax to do it For training, I do ./vw -d ~/Desktop/new_data.txt --passes 20 --binary --cache_file c...

I've seen a few questions on class imbalance in a multiclass setting. However, I have a multi-label problem, so how would you deal with it in this case? I have a set of around 300k text examples. ...

Does Vowpal Wabbit automatically shuffle its data after every epoch/pass? I'm hoping the created cache file will contain the shuffling meta-data that is necessary for online algorithms like VW's de...

Has anyone managed to run an ordinary least squares regression in Vowpal Wabbit? I'm trying to confirm that it will return the same answer as the exact solution, i.e. when choosing a to minimize ||...

I am trying to ascertain how VowpalWabbit's "state" is maintained as the size of our input set grows. In a typical machine learning environment, if I have 1000 input vectors, I would expe...