使用lambda函数对整个列进行定形 [英] lemmatize an entire column using lambda function
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问题描述
我已经对该代码测试了一个句子,我想对其进行转换,以便可以使整列的词素化,其中每一行包含单词而没有标点符号,例如:
import wordnet, nltk
nltk.download('wordnet')
from nltk.stem import WordNetLemmatizer
from nltk.corpus import wordnet
import pandas as pd
df = pd.read_excel(r'C:\Test2\test.xlsx')
# Init the Wordnet Lemmatizer
lemmatizer = WordNetLemmatizer()
sentence = 'FINAL_KEYWORDS'
def get_wordnet_pos(word):
"""Map POS tag to first character lemmatize() accepts"""
tag = nltk.pos_tag([word])[0][1][0].upper()
tag_dict = {"J": wordnet.ADJ,
"N": wordnet.NOUN,
"V": wordnet.VERB,
"R": wordnet.ADV}
return tag_dict.get(tag, wordnet.NOUN)
#Lemmatize a Sentence with the appropriate POS tag
sentence = "The striped bats are hanging on their feet for best"
print([lemmatizer.lemmatize(w, get_wordnet_pos(w)) for w in nltk.word_tokenize(sentence)])
让我们假设列名称为df ['keywords'],您能帮我使用lambda函数来使整个列均化吗?
非常感谢
解决方案
在这里:
- 使用
apply
应用于列的句子 - 使用lambda表达式获取
sentence
作为输入并应用您编写的功能,类似于在print语句中使用的方式
作为词干化关键字:
# Lemmatize a Sentence with the appropriate POS tag
df['keywords'] = df['keywords'].apply(lambda sentence: [lemmatizer.lemmatize(w, get_wordnet_pos(w)) for w in nltk.word_tokenize(sentence)])
作为修饰词的句子( join
关键字使用''):
# Lemmatize a Sentence with the appropriate POS tag
df['keywords'] = df['keywords'].apply(lambda sentence: ' '.join([lemmatizer.lemmatize(w, get_wordnet_pos(w)) for w in nltk.word_tokenize(sentence)]))
I have this code tested for a sentence and I want to convert it so that I can lemmatize an entire column where each row consists in words without punctuation like: deportivas calcetin hombres deportivas shoes
import wordnet, nltk
nltk.download('wordnet')
from nltk.stem import WordNetLemmatizer
from nltk.corpus import wordnet
import pandas as pd
df = pd.read_excel(r'C:\Test2\test.xlsx')
# Init the Wordnet Lemmatizer
lemmatizer = WordNetLemmatizer()
sentence = 'FINAL_KEYWORDS'
def get_wordnet_pos(word):
"""Map POS tag to first character lemmatize() accepts"""
tag = nltk.pos_tag([word])[0][1][0].upper()
tag_dict = {"J": wordnet.ADJ,
"N": wordnet.NOUN,
"V": wordnet.VERB,
"R": wordnet.ADV}
return tag_dict.get(tag, wordnet.NOUN)
#Lemmatize a Sentence with the appropriate POS tag
sentence = "The striped bats are hanging on their feet for best"
print([lemmatizer.lemmatize(w, get_wordnet_pos(w)) for w in nltk.word_tokenize(sentence)])
Let's suppose Column name is df['keywords'], can you help me use a lambda function in order to lemmatize the entire column like I lemmatize the sentence above?
Many thanks in advance
解决方案
Here you go:
- Use
apply
to apply on the column's sentences - Use lambda expression that gets a
sentence
as input and applies the function you wrote, in a similar to how you used in the print statement
As lemmatized keywords:
# Lemmatize a Sentence with the appropriate POS tag
df['keywords'] = df['keywords'].apply(lambda sentence: [lemmatizer.lemmatize(w, get_wordnet_pos(w)) for w in nltk.word_tokenize(sentence)])
As a lemmatized sentence (join
keywords using ' '):
# Lemmatize a Sentence with the appropriate POS tag
df['keywords'] = df['keywords'].apply(lambda sentence: ' '.join([lemmatizer.lemmatize(w, get_wordnet_pos(w)) for w in nltk.word_tokenize(sentence)]))
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