segfault for interpolate-ngram

[GoogleCodeExporter]

Hi I'm trying to interpolate two fairly straightforward 3gram lms with the
interpolate-ngram tool.

The command I'm running is,
-------------------
$ interpolate-ngram -o 3 -l lm1.arpa,lm2.arpa -wl lm1lm2.arpa
Loading component LM lm1.arpa...
Loading component LM lm2.arpa...
Segmentation fault
-------------------

The first lm was created with the estimate-ngram tool from a fairly small
training text (apprx 70mb),

$ estimate-ngram -t lm1.txt -wl lm1.arpa -o 3

The second lm is the gigaword 64k NVP 3gram model from Keith Vertanen's
open source LM page,

http://www.keithv.com/software/giga/

My guess is that there is something about the KV model that
interpolate-ngram doesn't like, but it isn't terribly clear what that might be.

Also, neither of the vocabularies is a subset of the other (although I
don't know whether or not that is relevant).

Original issue reported on code.google.com by [email protected] on 28 Feb 2010 at 1:47