我希望使用sklearn.preprocessing
中的MinMaxScaler
对训练集和测试集进行归一化。但是,该包似乎无法接受我的测试数据集。
import pandas as pd
import numpy as np
# Read in data.
df_wine = pd.read_csv('https://archive.ics.uci.edu/ml/machine-learning-databases/wine/wine.data',
header=None)
df_wine.columns = ['Class label', 'Alcohol', 'Malic acid', 'Ash',
'Alcalinity of ash', 'Magnesium', 'Total phenols',
'Flavanoids', 'Nonflavanoid phenols', 'Proanthocyanins',
'Color intensity', 'Hue', 'OD280/OD315 of diluted wines',
'Proline']
# Split into train/test data.
from sklearn.model_selection import train_test_split
X = df_wine.iloc[:, 1:].values
y = df_wine.iloc[:, 0].values
X_train, y_train, X_test, y_test = train_test_split(X, y, test_size=0.3,
random_state = 0)
# Normalize features using min-max scaling.
from sklearn.preprocessing import MinMaxScaler
mms = MinMaxScaler()
X_train_norm = mms.fit_transform(X_train)
X_test_norm = mms.transform(X_test)
执行代码时,我得到了一个警告:
DeprecationWarning: Passing 1d arrays as data is deprecated in 0.17 and will raise ValueError in 0.19. Reshape your data either using X.reshape(-1, 1) if your data has a single feature or X.reshape(1, -1) if it contains a single sample.
,并且还有一个错误:ValueError: operands could not be broadcast together with shapes (124,) (13,) (124,)
。尝试重新调整数据仍然会出现错误。
X_test_norm = mms.transform(X_test.reshape(-1, 1))
这种重塑导致了一个错误:ValueError: 非可广播输出操作数的形状为(124,1),与广播形状(124,13)不匹配
。
任何对如何修复此错误的建议都将有所帮助。
X_train
和X_test
等更多数组。 - hpaulj