如何拆分数据？答案

【问题标题】：How to split data?如何拆分数据？
【发布时间】：2018-01-18 09:48:30
【问题描述】：

假设我的数据框中有 1010 行。现在我想使用train_test_split 拆分它们，以便前 1000 行用于训练数据，接下来 10 行用于测试数据。

# Natural Language Processing
# Importing the libraries
import numpy as np
import matplotlib.pyplot as plt
import pandas as pd

# Importing the dataset
dataset = pd.read_csv('Restaurant_Reviews.tsv', delimiter = '\t', quoting = 3)
newset=pd.read_csv('Test.tsv',delimiter='\t',quoting=3)
frames=[dataset,newset]
res=pd.concat(frames,ignore_index=True)
# Cleaning the texts
import re
import nltk
nltk.download('stopwords')
from nltk.corpus import stopwords
from nltk.stem.porter import PorterStemmer
corpus = []
for i in range(0, 1010):
    review = re.sub('[^a-zA-Z]', ' ', res['Review'][i])
    review = review.lower()
    review = review.split()
    ps = PorterStemmer()
    review = [ps.stem(word) for word in review if not word in set(stopwords.words('english'))]
    review = ' '.join(review)
    corpus.append(review)
from sklearn.feature_extraction.text import CountVectorizer
cv=CountVectorizer(max_features=1500)
#X=cv.fit_transform(corpus).toarray()
X=corpus
y=res.iloc[:,1].values

# Splitting the dataset into the Training set and Test set
from sklearn.cross_validation import train_test_split
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size = 0.01, random_state = 0)

【问题讨论】：

欢迎来到 StackOverflow。请花时间阅读how to provide a great pandas example 上的这篇文章以及如何提供minimal, complete, and verifiable example 并相应地修改您的问题。 how to ask a good question 上的这些提示也可能有用。

标签： python-3.x pandas machine-learning spyder sklearn-pandas

【解决方案1】：

如果您知道您需要训练中的前 1000 个样本和测试中的后 10 个样本，最好手动进行，因为 train_test_split 会随机拆分。

X_train = X[:1000]
X_test = X[1000:]
y_train = y[:1000]
y_test = y[1000:]

【讨论】：