【问题标题】：numpy array:tuple index out of rangenumpy数组：元组索引超出范围
【发布时间】：2019-11-20 09:22:41
【问题描述】：

#converting the lists into numpy arrays
x_train=np.array(x_train)
x_test=np.array(x_test)
y_train=np.array(y_train)
y_test=np.array(y_test)
x_train.shape,x_test.shape,y_train.shape,y_test.shape

问题从下面的代码开始

整形为 2d 以保存为 csv 格式

x_train_2d=np.reshape(x_train,(x_train.shape[0],x_train.shape[1]*x_train.shape[2]))
x_test_2d=np.reshape(x_test,(x_test.shape[0],x_test.shape[1]*x_test.shape[2]))
x_train_2d.shape,x_test_2d.shape

【问题讨论】：

数组的原始形状是什么？
也发布错误输出
numpy数组_train.shape,x_test.shape,y_train.shape,y_test.shape的形状是((7895, 40), (837, 40), (7895,), (837, ))
形成的错误是：IndexError Traceback (最近一次调用最后一次) in () ----> 1 x_train_2d=np.reshape(x_train, (x_train.shape[0],x_train.shape[1]*x_train.shape[2])) 2 x_test_2d=np.reshape(x_test,(x_test.shape[0],x_test.shape[1]*x_test.shape [2])) 3 x_train_2d.shape,x_test_2d.shape IndexError: tuple index out of range
输出形状应该是什么。

标签： python-3.x export-to-csv google-colaboratory

【解决方案1】：

您可以做的可能是以下。

创建一个包含 40 values from second dimension of X, and Y value 列的 csv 文件行将首先是训练数据，然后是测试数据

data_train = np.c_[x_train, y_train]
data_test = np.c_[x_test, y_test]
data = np.r_[data_train, data_test]
print(data.shape)
np.savetxt('filename.csv', data, delimiter=',')

输出数据形状为

(8732, 41)

【讨论】：