NOW PART OF rsparse

What is this?

R package which implements Follow the proximally-regularized leader algorithm. It allows to solve very large problems with stochastic gradient descend online learning. See Ad Click Prediction: a View from the Trenches for example.

Features

Online learning - can easily learn model in online fashion
Fast (I would say very fast) - written in Rcpp
Parallel, asyncronous. Benefit from multicore systems (if your compiler supports openmp) - Hogwild! style updates under the hood

Notes

Only logistic regerssion implemented at the moment
Core input format for matrix is CSR - Matrix::RsparseMatrix. Hoewer common R Matrix::CpasrseMatrix ( aka dgCMatrix) will be converted automatically

Todo list

gaussian, poisson family
vignette
improve test coverage (but package battle tested on kaggle outbrain competition and contribute to our 13 place)

Quick reference

library(Matrix)
library(FTRL)
N_SMPL = 5e3
N_FEAT = 1e3
NNZ = N_SMPL * 30

set.seed(1)
i = sample(N_SMPL, NNZ, TRUE)
j = sample(N_FEAT, NNZ, TRUE)
y = sample(c(0, 1), N_SMPL, TRUE)
x = sample(c(-1, 1), NNZ, TRUE)
odd = seq(1, 99, 2)
x[i %in% which(y == 1) & j %in% odd] = 1
m = sparseMatrix(i = i, j = j, x = x, dims = c(N_SMPL, N_FEAT), giveCsparse = FALSE)
X = as(m, "RsparseMatrix")

ftrl = FTRL$new(alpha = 0.01, beta = 0.1, lambda = 20, l1_ratio = 1, dropout = 0)
ftrl$partial_fit(X, y, nthread = 1)
accuracy_1 = sum(ftrl$predict(X, nthread = 1) >= 0.5 & y) / length(y)

w = ftrl$coef()


ftrl$partial_fit(X, y, nthread = 1)
accuracy_2 = sum(ftrl$predict(X, nthread = 1) >= 0.5 & y) / length(y)

accuracy_2 > accuracy_1

dselivanov/FTRL

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