ValueError: Expected 2D array, got 1D array instead

x_train = np.array([6, 8, 10, 14, 18])
y_ = np.array([7, 9, 13, 17.5, 18])
model.fit(x_train, y_)

错误
ValueError: Expected 2D array, got 1D array instead
期望2维数组，输入的是一维数组
Reshape your data either using array.reshape(-1, 1) if your data has a single feature or array.reshape(1, -1) if it contains a single sample.

这是由于在sklearn中，所有的数据都应该是二维矩阵，哪怕它只是单独一行或一列（比如前面做预测时，仅仅只用了一个样本数据），所以需要使用.reshape(1,-1)进行转换

解决

x_train = np.array([6, 8, 10, 14, 18]).reshape(-1, 1)
y_ = np.array([7, 9, 13, 17.5, 18]).reshape(-1, 1)
model.fit(x_train, y_)

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