用Python在NLP命名实体识别中提取人名

Question

我有一个句子，我需要单独识别人名：

例如：

sentence = "Larry Page is an American business magnate and computer scientist who is the co-founder of Google, alongside Sergey Brin"

我使用了下面的代码来识别ner。

from nltk import word_tokenize, pos_tag, ne_chunk
print(ne_chunk(pos_tag(word_tokenize(sentence))))

我收到的输出是：

(S
  (PERSON Larry/NNP)
  (ORGANIZATION Page/NNP)
  is/VBZ
  an/DT
  (GPE American/JJ)
  business/NN
  magnate/NN
  and/CC
  computer/NN
  scientist/NN
  who/WP
  is/VBZ
  the/DT
  co-founder/NN
  of/IN
  (GPE Google/NNP)
  ,/,
  alongside/RB
  (PERSON Sergey/NNP Brin/NNP))

我想提取所有的人名，比如

Larry Page
Sergey Brin

为了达到这个目的，我引用了这个link并尝试了这个。

from nltk.tag.stanford import StanfordNERTagger
st = StanfordNERTagger('/usr/share/stanford-ner/classifiers/english.all.3class.distsim.crf.ser.gz','/usr/share/stanford-ner/stanford-ner.jar')

但是，我继续得到这个错误：

LookupError: Could not find stanford-ner.jar jar file at /usr/share/stanford-ner/stanford-ner.jar

我在哪里可以下载这个文件？

如前所述，我期望以列表或字典的形式得到的结果是：

Larry Page
Sergey Brin

Answer 1

很长时间

请仔细阅读以下内容：

• https://stackoverflow.com/a/49345866/610569
• Extract list of Persons and Organizations using Stanford NER Tagger in NLTK

了解解决方案，不要只是复制和粘贴。

---

TL；博士

在终端：

pip install -U nltk

wget http://nlp.stanford.edu/software/stanford-corenlp-full-2016-10-31.zip
unzip stanford-corenlp-full-2016-10-31.zip && cd stanford-corenlp-full-2016-10-31

java -mx4g -cp "*" edu.stanford.nlp.pipeline.StanfordCoreNLPServer \
-preload tokenize,ssplit,pos,lemma,parse,depparse \
-status_port 9000 -port 9000 -timeout 15000

在Python中

from nltk.tag.stanford import CoreNLPNERTagger

def get_continuous_chunks(tagged_sent):
    continuous_chunk = []
    current_chunk = []

    for token, tag in tagged_sent:
        if tag != "O":
            current_chunk.append((token, tag))
        else:
            if current_chunk: # if the current chunk is not empty
                continuous_chunk.append(current_chunk)
                current_chunk = []
    # Flush the final current_chunk into the continuous_chunk, if any.
    if current_chunk:
        continuous_chunk.append(current_chunk)
    return continuous_chunk


stner = CoreNLPNERTagger()
tagged_sent = stner.tag('Rami Eid is studying at Stony Brook University in NY'.split())

named_entities = get_continuous_chunks(tagged_sent)
named_entities_str_tag = [(" ".join([token for token, tag in ne]), ne[0][1]) for ne in named_entities]


print(named_entities_str_tag)

[出局]：

[('Rami Eid', 'PERSON'), ('Stony Brook University', 'ORGANIZATION'), ('NY', 'LOCATION')]

你也可以找到这个帮助：Unpacking a list / tuple of pairs into two lists / tuples

Answer 2

首先，您需要下载jar文件和其他必要的文件。按照链接：https://gist.github.com/troyane/c9355a3103ea08679baf。 运行代码下载文件（除了最后几行）。下载部分完成后，现在就可以执行提取部分了。

from nltk.tag.stanford import StanfordNERTagger
st = StanfordNERTagger('/home/saheli/Downloads/my_project/stanford-ner/english.all.3class.distsim.crf.ser.gz',
                   '/home/saheli/Downloads/my_project/stanford-ner/stanford-ner.jar')