如何使用 Spacy 获得合适的主题？

Question

我需要从句子中获取正确的主语或主语短语。 请给我一个建议或有关此手册的链接。我试着google，但是材料太复杂了(

我做了什么：

x = "The Titanic could have been saved if it wasn't for a 30-second delay in giving the order to change course after spotting the iceberg."    
def get_subject(x):
    nlp = spacy.load('en_core_web_trf')
    doc = nlp(x)
    sub_toks = [tok for tok in doc if (tok.dep_ == "nsubj")]
    return sub_toks

我把“它”作为主题。它在语法上是正确的，但我想得到“泰坦尼克号”。

另外，我还有一个尝试：

x = "The Queen of England owns a McDonald's near Buckingham Palace."
def extract_proper_nouns(x):
    nlp = spacy.load('en_core_web_trf')
    doc = nlp(x)
    pos = [tok.i for tok in doc if tok.pos_ == "PROPN"]
    consecutives = []
    current = []
    for elt in pos:
        if len(current) == 0:
            current.append(elt)
        else:
            if current[-1] == elt - 1:
                current.append(elt)
            else:
                consecutives.append(current)
                current = [elt]
    if len(current) != 0:
        consecutives.append(current)
    return [doc[consecutive[0]:consecutive[-1] + 1] for consecutive in consecutives]

我得到了 [Queen, England, McDonald, Buckingham Palace]，但我想得到“英国女王”。 我读过有关短语合并的内容，但不明白如何使用它/...