Hi,

GIZA++ is designed for parallel sentence pairs, but it is tolerant to
some degree of noise. If you feed "comparable" sentence pairs,
which I assume you mean to be sentence pairs which are only
partially (or not at all) translationally equivalent, then you will
hopefully get word alignments for the relevant parts, but also
alignments for the mismatched parts. Given a large amount
of such data, you may be able to learn useful word translation
tables - but it depends on the noisiness of the data.

If you add parallel sentence pairs, you will likely get better
alignments.

-phi


On Thu, Jun 19, 2014 at 7:20 AM, alireza tabebordbar
<[email protected]> wrote:
> Hi all
> I am Master degree Student and I'm New to SMT.
> I extracted some Comparable sentences and I want to use Giza++ for
> word alignment.I Think Giza Use EM algorithm for aligning words,
> However I don't know that I can feed comparable sentences directly to
> Giza++ or I have combine them with some Parallel sentences.
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