hfst-reweight(1) =Reweight transducer weights simply


hfst-reweight [OPTIONS...] [INFILE]


Reweight transducer weights simply

Common options:

-h, --help
Print help message
-V, --version
Print version info
-v, --verbose
Print verbosely while processing
-q, --quiet
Only print fatal erros and requested output
-s, --silent
Alias of --quiet

Input/Output options:

-i, --input=INFILE
Read input transducer from INFILE
-o, --output=OUTFILE
Write output transducer to OUTFILE

Reweighting options:

-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 havins symbol SYM
-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.

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 <[email protected]> or directly to our bug tracker at: <https://sourceforge.net/tracker/?atid=1061990&group_id=224521&func=browse>

hfst-reweight home page: <https://kitwiki.csc.fi/twiki/bin/view/KitWiki//HfstReweight>
General help using HFST software: <https://kitwiki.csc.fi/twiki/bin/view/KitWiki//HfstHome>


Copyright © 2010 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.