SRL with nlpnet not works with some sentences

Question

I installed nlpnet and downloaded data. But it works only with some sentences. I use Ubuntu 13.04 32bits and Python 2.7.4 with virtualenv.

Here I posted two examples, the first seems to work, the second no:

Example 1 (Seem to work):

python nlpnet-tag.py srl /path/to/nlpnet-data/
This is the first sentence of the paragraph. This is the second sentence of the paragraph.
This is the first sentence of the paragraph .
sentence
    A1: the paragraph
    A0: first
    V: sentence

This is the second sentence of the paragraph .
sentence
    A1: the paragraph
    A0: second
    V: sentence

Example 2 (Not works):

This sentence is taked from CoNLL-2005 Examples

python nlpnet-tag.py srl /path/to/nlpnet-data/
The $1.4 billion robot spacecraft faces a six-year journey to explore Jupiter and its 16 known moons.
The $ 1.4 billion robot spacecraft faces a six-year journey to explore Jupiter and its 16 known moons .

I also tested from python and tokenization works but in the second example calling arg_structures, returns an empty list.

I missed something? ...will be appreciated if you can provide a solution even when not use nlpnet.

Thanks

PS: I also reported this issue but want to see if someone help me to fix it.

Answer 1

erickrf, the author of the package, answer it:

the problem here is that the trained models from http://nilc.icmc.usp.br/nilc/download/nlpnet-data.zip were trained for Portuguese. It won't work in English.

When you get an empty arg_structures list, it means that the network didn't recognize any token as a predicate.