used as feature name.
used as feature name.
Pre-hashed feature index.
Featurize a single row.
Featurize a single row.
input row.
output indices.
output values.
this interface isn't very Scala idiomatic, but it avoids lots of allocation. Also due to SparseVector limitations we don't support 64bit indices (e.g. indices are signed 32bit ints)
input field index.
input field index.
Initialize hasher that already pre-hashes the column prefix.
Initialize hasher that already pre-hashes the column prefix.
Featurize boolean value into native VW structure. (True = hash(feature name):1, False ignored).