Function rustfst::algorithms::concat
source · pub fn concat<W, F1, F2, F3>(fst_1: &F1, fst_2: &F2) -> Result<F3, Error>where
W: Semiring,
F1: ExpandedFst<W = W>,
F2: ExpandedFst<W = W>,
F3: MutableFst<W = W>,
Expand description
Performs the concatenation of two wFSTs. If A
transduces string x
to y
with weight a
and B
transduces string w
to v
with weight b
, then their concatenation
transduces string xw
to yv
with weight a ⊗ b
.
Example
use rustfst::utils::transducer;
use rustfst::semirings::{Semiring, IntegerWeight};
use rustfst::fst_impls::VectorFst;
use rustfst::fst_traits::PathsIterator;
use rustfst::path::Path;
use rustfst::algorithms::concat;
use std::collections::HashSet;
let fst_a : VectorFst<IntegerWeight> = transducer(vec![2].into_iter(), vec![3].into_iter()).unwrap();
let fst_b : VectorFst<IntegerWeight> = transducer(vec![6].into_iter(), vec![5].into_iter()).unwrap();
let fst_res : VectorFst<IntegerWeight> = concat(&fst_a, &fst_b).unwrap();
let paths : HashSet<_> = fst_res.paths_iter().collect();
let mut paths_ref = HashSet::new();
paths_ref.insert(Path::new(vec![2, 6], vec![3, 5], IntegerWeight::one()));
assert_eq!(paths, paths_ref);