python - Maltparser 在 NLTK 中给出错误

Question

我的代码是

from nltk.parse import malt
mp = malt.MaltParser(working_dir="/other/apps/maltparser-1.8.1",mco="engmalt.poly-1.7.mco",additional_java_args=['-Xmx1024m'])
print mp.raw_parse("Hello World")

错误是

    Traceback (most recent call last):
  File "malt.py", line 13, in <module>
    print mp.raw_parse("Hello World")
  File "/usr/local/lib/python2.7/dist-packages/nltk/parse/malt.py", line 139, in raw_parse
    return self.parse(words, verbose)
  File "/usr/local/lib/python2.7/dist-packages/nltk/parse/malt.py", line 126, in parse
    return self.parse_sents([sentence], verbose)[0]
  File "/usr/local/lib/python2.7/dist-packages/nltk/parse/malt.py", line 114, in parse_sents
    return self.tagged_parse_sents(tagged_sentences, verbose)
  File "/usr/local/lib/python2.7/dist-packages/nltk/parse/malt.py", line 194, in tagged_parse_sents
    "code %d" % (' '.join(cmd), ret))
Exception: MaltParser parsing (java -Xmx1024m -jar /usr/local/bin/malt.jar -w /other/apps/maltparser-1.8.1 -c engmalt.poly-1.7.mco -i /other/apps/maltparser-1.8.1/malt_input.conlljOba1P -o /other/apps/maltparser-1.8.1/malt_output.conllPLcoTu -m parse) failed with exit code 1

Answer 1

NLTK 中的 MaltParser API 刚刚有 a patch修复并稳定了它过去存在的问题:

• How to use malt parser in python nltk
• Malt Parser throwing class not found exception
• MaltParser Not Working in Python NLTK

这是一个如何在 NLTK 中使用 MaltParser API 的例子:

# Upgrade your NLTK.
alvas@ubi:~$ cd ~
alvas@ubi:~$ pip install -U nltk

# Get the latest MaltParser and model
alvas@ubi:~$ wget http://maltparser.org/dist/maltparser-1.8.1.zip
alvas@ubi:~$ unzip maltparser-1.8.1.zip 
alvas@ubi:~$ wget http://www.maltparser.org/mco/english_parser/engmalt.poly-1.7.mco

# In python, now you can do this:
alvas@ubi:~$ python
>>> from nltk.parse.malt import MaltParser
>>> mp = MaltParser('/home/alvas/maltparser-1.8.1', '/home/alvas/engmalt.poly-1.7.mco')
>>> sent1 = 'I shot an elephant in my pajamas .'.split()
>>> print(mp.parse_one(sent1).tree())
(shot I (elephant an (in (pajamas my))) .)

(请参阅 here 以获得更多演示代码或 here 以获得更详细的演示代码)

---

请注意，您还可以使用导出功能，并且可以在初始化 MaltParser 对象时避免使用完整路径。但是您仍然必须告诉对象要查找的解析器目录的名称和模型文件名是什么，例如

alvas@ubi:~$ export MALT_PARSER='/home/$UID/maltparser-1.8.1/'
alvas@ubi:~$ export MALT_MODEL='/home/$UID/engmalt.poly-1.7.mco' 
alvas@ubi:~$ python
>>> from nltk.parse.malt import MaltParser
>>> mp = MaltParser('maltparser-1.8.1', 'engmalt.poly-1.7.mco')
>>> sent1 = 'I shot an elephant in my pajamas .'.split()
>>> print(mp.parse_one(sent1).tree())
(shot I (elephant an (in (pajamas my))) .)