I'm trying to build my own language model by extending the default one
at /usr/local/share/ocropus/models/default.fst. Following the example
of ocropus-linefst and fstutils, I'm doing the following:
fst = openfst.StdVectorFst.Read("/usr/local/share/ocropus/models/
default.fst")
filenames = glob.glob("training/*.gt.txt")
for filename in filenames:
file = open(filename)
for line in file.readlines():
l = line.strip()
if not l:
continue
fstutils.add_line(fst, l)
det = Fst()
openfst.Determinize(fst, det)
(...)
The rest is truncated because I never get there. The Determinize
function aborts the program with the message:
FATAL: StringWeight::Plus: unequal arguments (non-functional FST?)
Is this even supposed to work? The same crash happens when I run
Determinize on the original model, i.e. without running the for loop
above. I suppose I should load the default model into an Ocropus
container created with ocropy.make_OcroFST(), but then I can't use the
functions in fstutils, which expect StdVectorFst. Does anyone have any
advice here?
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