Maltparser在NLTK中给出错误

Question

我的编码是

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MaltParserAPI仅有一个修补程序，该修补程序修复并稳定了其以前存在的问题：

这是如何在NLTK中使用MaltParser API的示例：

# 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))) .)

（参见这里更多的演示代码或这里的比较详细的演示代码）

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，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))) .)