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[英]cannot concatenate object of type “<class 'numpy.ndarray'>”; only pd.Series, pd.DataFrame, and pd.Panel (deprecated) objs are valid
[英]cannot concatenate object of type '<class 'numpy.ndarray'>'; only Series and DataFrame objs are valid
我打算在使用 StandardScaler 后使用 pairplot 可視化數據,但我的代碼產生以下錯誤
raise TypeError(msg)
TypeError: cannot concatenate object of type '<class 'numpy.ndarray'>'; only Series and DataFrame objs are valid
完整代碼
from matplotlib import pyplot as plt
from sklearn.model_selection import train_test_split
import seaborn as sns
import pandas as pd
import numpy as np
from sklearn.preprocessing import StandardScaler
iris = sns.load_dataset('iris')
X = iris.drop(columns='species')
y = iris['species']
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.20, random_state=42)
X_train=StandardScaler().fit_transform(X_train)
sns.pairplot(data=pd.concat([X_train, y_train], axis=1), hue=y_train.name)
plt.show()
使用StandardScaler
后,您的 X_train (之前是pd.DataFrame
)已變為numpy.ndarray
,這就是為什么您不能連接X_train
和y_train
的原因。 因為X_train
是 NumPy 數組,而y_train
是 Pandas DataFrame
要使用 concat, X_train
和y_train
都必須是 Pandas DataFrame,因此使用此代碼將X_train
轉換為 DataFrame。
X_train = StandardScaler().fit_transform(X_train)
X_train = pd.DataFrame(X_train, columns = X.columns)
sns.pairplot(data=pd.concat([X_train, y_train], axis=1), hue=y_train.name)
plt.show()
它會起作用的。
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