Description
I/O Operations with Sparse Matrices.
Description
Fast 'SVMlight' reader and writer. 'SVMlight' is most commonly used format for storing sparse matrices (possibly with some target variable) on disk. For additional information about 'SVMlight' format see <http://svmlight.joachims.org/>.
README.md
sparsio
sparsio is a small (the only dependency is Rcpp) R package for sparse matrices Input/Output. It provides fastsvmlight reader and writer.
read_svmlight()write_svmlight()
Quick reference
library(Matrix)
library(sparsio)
N = 1e8
i = sample(1e5, N, T)
j = sample(1e5, N, T)
vals = runif(N)
x = sparseMatrix(i, j, x = vals)
print(object.size(x), units = "Gb")
# 1.1 Gb
y = sample(c(0, 1), nrow(x), replace = TRUE)
f = tempfile(fileext = ".svmlight")
system.time(write_svmlight(x, y, f))
# user system elapsed
# 68.014 2.785 70.899
file.size(f)/1e9
# 1.48135 Gb
system.time(x2 <- read_svmlight(f, type = "CsparseMatrix"))
# user system elapsed
# 55.021 2.803 57.892
all.equal(x2$x, x)
# "Mean relative difference: 4.636406e-07"
all.equal(x2$y, y)
# TRUE