[英]Scikit-learn does not work with string value on KNN
I'm using Scikit learn to do a K-Nearest Neigbour Classification: 我正在使用Scikit学习做一个K-Nearest Neigbour分类:
from sklearn.neighbors import KNeighborsClassifier
model=KNeighborsClassifier()
model.fit(train_input,train_labels)
If I print my data: 如果我打印我的数据:
print("train_input:")
print(train_input.iloc[0])
print("\n")
print("train_labels:")
print(train_labels.iloc[0])
I get this: 我明白了:
train_input:
PassengerId 1
Pclass 3
Name Braund, Mr. Owen Harris
Sex male
Age 22
SibSp 1
Parch 0
Ticket A/5 21171
Fare 7.25
Cabin NaN
Embarked S
Name: 0, dtype: object
train_labels:
0
The code fails with this error: 代码失败并出现此错误:
ValueError Traceback (most recent call last)
<ipython-input-21-1f18eec1e602> in <module>()
63
64 model=KNeighborsClassifier()
---> 65 model.fit(train_input,train_labels)
ValueError: could not convert string to float: 'Q'
So, does the KNN algorithm not work with String
values? 那么,KNN算法不能使用
String
值吗?
How can I modify my data such that it fits the KNN implementation in Scikit-Learn? 如何修改我的数据以使其符合Scikit-Learn中的KNN实现?
For nominal String
features, consider one hot encoding: http://scikit-learn.org/stable/modules/generated/sklearn.preprocessing.OneHotEncoder.html . 对于名义
String
功能,请考虑一个热门编码: http : //scikit-learn.org/stable/modules/generated/sklearn.preprocessing.OneHotEncoder.html 。
For ordinal String
features, consider label encoding (with a sensible ordering based on your understanding of the feature): http://scikit-learn.org/stable/modules/generated/sklearn.preprocessing.LabelEncoder.html . 对于序数
String
功能,请考虑标签编码(根据您对该功能的理解,使用合理的排序): http : //scikit-learn.org/stable/modules/generated/sklearn.preprocessing.LabelEncoder.html 。
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