Hi,

I'm implementing a stateless feature function (for the phrase-based 
decoder) and I encountered several problems. Is it possible to get the 
source sentence and source phrase span somehow? The feature (phrase 
sense disambiguation) depends on the context of the source phrase.

If it's not possible, would it make sense to add an additional interface 
for context-dependent stateless functions? I'm also wondering if anyone 
else would benefit from an interface that would allow scoring all 
translation options of a source phrase at once. (We would, but we can 
work around it by caching etc.)

Also, is there a reason why scores by stateless features are computed 
during decoding? If they were computed for each translation option ahead 
of time (once full translation options are created), the decoder could 
use them in the initial pruning. It could also prevent repeated 
computation of feature function values (e.g. our feature is costly to 
compute).

Thanks!

Ales Tamchyna
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