值错误:未知标签类型:“未知" [英] ValueError: Unknown label type: 'unknown'

问题描述

我尝试运行以下代码.顺便说一句，我是 python 和 sklearn 的新手.

I try to run following code. Btw, I am new to both python and sklearn.

import pandas as pd
import numpy as np
from sklearn.linear_model import LogisticRegression


# data import and preparation
trainData = pd.read_csv('train.csv')
train = trainData.values
testData = pd.read_csv('test.csv')
test = testData.values
X = np.c_[train[:, 0], train[:, 2], train[:, 6:7],  train[:, 9]]
X = np.nan_to_num(X)
y = train[:, 1]
Xtest = np.c_[test[:, 0:1], test[:, 5:6],  test[:, 8]]
Xtest = np.nan_to_num(Xtest)


# model
lr = LogisticRegression()
lr.fit(X, y)

其中 y 是 0 和 1 的 np.ndarray

where y is a np.ndarray of 0's and 1's

我收到以下信息:

文件C:Anaconda3libsite-packagessklearnlinear_modellogistic.py"，第 1174 行，适合check_classification_targets(y)

File "C:Anaconda3libsite-packagessklearnlinear_modellogistic.py", line >1174, in fit check_classification_targets(y)

文件C:Anaconda3libsite-packagessklearnutilsmulticlass.py"，第 172 行，>在 check_classification_targetsraise ValueError("未知标签类型:%r" % y_type)

File "C:Anaconda3libsite-packagessklearnutilsmulticlass.py", line 172, >in check_classification_targets raise ValueError("Unknown label type: %r" % y_type)

ValueError: Unknown label type: 'unknown'

ValueError: Unknown label type: 'unknown'

来自 sklearn 文档:http://scikit-learn.org/stable/modules/generated/sklearn.linear_model.LogisticRegression.html#sklearn.linear_model.LogisticRegression.fit

from sklearn documentation: http://scikit-learn.org/stable/modules/generated/sklearn.linear_model.LogisticRegression.html#sklearn.linear_model.LogisticRegression.fit

y : 类似数组，形状 (n_samples,)目标值(分类中的类标签，回归中的实数)

y : array-like, shape (n_samples,) Target values (class labels in classification, real numbers in regression)

我的错误是什么?

更新:

y 是数组([0.0, 1.0, 1.0, ..., 0.0, 1.0, 0.0], dtype=object) 大小是 (891,)

y is array([0.0, 1.0, 1.0, ..., 0.0, 1.0, 0.0], dtype=object) size is (891,)

推荐答案

你的 y 是 object 类型，所以 sklearn 无法识别它的类型.在 y = train[:, 1] 行之后添加 y=y.astype('int') 行.

Your y is of type object, so sklearn cannot recognize its type. Add the line y=y.astype('int') right after the line y = train[:, 1].

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