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我通过机器学习的教程的工作的基础上,虹膜数据集:用于填充test_train_split的数组切片符号?
sepal-length sepal-width petal-length petal-width class
0 5.1 3.5 1.4 0.2 Iris-setosa
1 4.9 3.0 1.4 0.2 Iris-setosa
2 4.7 3.2 1.3 0.2 Iris-setosa
...(146 more rows)
数据集最终被雕刻成两个单独的阵列,X和Y,并送入test_train_split
:
array = dataset.values
X = array[:,0:4]
Y = array[:,4]
validation_size = 0.20
seed = 7
X_train, X_validation, Y_train, Y_validation = train_test_split(X, Y,
test_size=validation_size, random_state=seed)
我想了解阵列切片表示法:
X = array[:,0:4]
Y = array[:,4]
究竟是生产这些切片命令?
'numpy' [索引文档](https://docs.scipy.org/doc/numpy/reference/arrays.indexing.html),因为存在更多的索引符号,您最终可能会遇到。 –
很好找,谢谢@DanielF –