hfst-reweight - =Reweight transducer weights simply
hfst-reweight [OPTIONS...] [INFILE]
Reweight transducer weights simply
- -a, --addition=AVAL
- add AVAL to matching weights
- -b, --multiplier=BVAL
- multiply matching weights by BVAL
- -F, --function=FNAME
- operate matching weights by FNAME
- -l, --lower-bound=LVAL
- match weights greater than LVAL
- -u, --upper-bound=UVAL
- match weights less than UVAL
- -I, --input-symbol=ISYM
- match arcs with input symbol ISYM
- -O, --output-symbol=OSYM
- match arcs with output symbol OSYM
- -S, --symbol=SYM
- match arcs with input or output symbol SYM or both
- -e, --end-states-only
- match end states only, no arcs
- -A, --arcs-only
- match arcs only, no end states
- -T, --tsv-file=TFILE
- read reweighting rules from TFILE
If OUTFILE or INFILE is missing or -, standard streams will be used. Format of result depends on format of INFILE If AVAL, BVAL or FNAME are omitted, they default to neutral elements of addition, multiplication or identity function. If LVAL or UVAL are omitted, they default to minimum and maximum values of the weight structure. If ISYM, OSYM or SYM are omitted, they default to a value that matches all arcs. Only one ISYM, OSYM and SYM can be given.
Float values are parsed with strtod(3) and integers strtoul(3). The functions allowed for FNAME are <cmath> float functions with parameter count of 1 and a matching return value: abs, acos, asin, ... sqrt, tan, tanh
The precedence of operands follows the formula BVAL * FNAME(w) + AVAL. The formula is applied iff: ((LVAL <= w) && (w <= UVAL)), where w is weight of arc, and (ISYM == i) && (OSYM == o) && ((SYM == i) || (SYM == o)) ^^ (end state && -e).
TFILE should contain lines with tab-separated pairs of SYM and AVAL or BVAL. AVAL values must be preceded by a + character, BVAL should be given as plain digits. Comment lines starting with # and empty lines are ignored.
Weights are by default modified for all arcs and end states, unless option --end-states-only or --arcs-only is used.
Report bugs to <firstname.lastname@example.org> or directly to our bug tracker at: <https://github.com/hfst/hfst/issues>
Copyright © 2017 University of Helsinki, License GPLv3: GNU
GPL version 3 <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.