Question

我有一个使用numpy创建的（5,5,5,5）矩阵，如下所示：

[[[[0.64 0.16 0.   0.   0.  ]
   [0.   0.64 0.16 0.   0.  ]
   [0.   0.   0.64 0.16 0.  ]
   [0.   0.   0.   0.64 0.16]
   [0.   0.   0.   0.   0.8 ]]

  [[0.16 0.04 0.   0.   0.  ]
   [0.   0.16 0.04 0.   0.  ]
   [0.   0.   0.16 0.04 0.  ]
   [0.   0.   0.   0.16 0.04]
   [0.   0.   0.   0.   0.2 ]]

  [[0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]]

  [[0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]]

  [[0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]]]


 [[[0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]]

  [[0.64 0.16 0.   0.   0.  ]
   [0.   0.64 0.16 0.   0.  ]
   [0.   0.   0.64 0.16 0.  ]
   [0.   0.   0.   0.64 0.16]
   [0.   0.   0.   0.   0.8 ]]

  [[0.16 0.04 0.   0.   0.  ]
   [0.   0.16 0.04 0.   0.  ]
   [0.   0.   0.16 0.04 0.  ]
   [0.   0.   0.   0.16 0.04]
   [0.   0.   0.   0.   0.2 ]]

  [[0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]]

  [[0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]]]


 [[[0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]]

  [[0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]]

  [[0.64 0.16 0.   0.   0.  ]
   [0.   0.64 0.16 0.   0.  ]
   [0.   0.   0.64 0.16 0.  ]
   [0.   0.   0.   0.64 0.16]
   [0.   0.   0.   0.   0.8 ]]

  [[0.16 0.04 0.   0.   0.  ]
   [0.   0.16 0.04 0.   0.  ]
   [0.   0.   0.16 0.04 0.  ]
   [0.   0.   0.   0.16 0.04]
   [0.   0.   0.   0.   0.2 ]]

  [[0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]]]


 [[[0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]]

  [[0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]]

  [[0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]]

  [[0.64 0.16 0.   0.   0.  ]
   [0.   0.64 0.16 0.   0.  ]
   [0.   0.   0.64 0.16 0.  ]
   [0.   0.   0.   0.64 0.16]
   [0.   0.   0.   0.   0.8 ]]

  [[0.16 0.04 0.   0.   0.  ]
   [0.   0.16 0.04 0.   0.  ]
   [0.   0.   0.16 0.04 0.  ]
   [0.   0.   0.   0.16 0.04]
   [0.   0.   0.   0.   0.2 ]]]


 [[[0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]]

  [[0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]]

  [[0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]]

  [[0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]
   [0.   0.   0.   0.   0.  ]]

  [[0.8  0.2  0.   0.   0.  ]
   [0.   0.8  0.2  0.   0.  ]
   [0.   0.   0.8  0.2  0.  ]
   [0.   0.   0.   0.8  0.2 ]
   [0.   0.   0.   0.   1.  ]]]]

我如何有效地将其转换为（25,25）矩阵，其第一行是前五个（5,5）块的第一行的串联，而第二行是该矩阵的第二行的串联前（5,5）个块，依此类推？例如，给定我的输入矩阵，输出矩阵的第一行应为：

[0.64 0.16  0.   0.   0.  0.16  0.04   0.   0.   0.   0.   0.   
0.   0.   0.   0.   0.   0.   0.   0.   0.   0.   0.   0.   
0.  ]

第六行应是第6到第10个5×5块的第一行的组合，即：

[0.   0.   0.   0.   0.  0.64  0.16   0.   0.   0.   0.16   
0.04   0.   0.   0.   0.   0.   0.   0.   0.   0.   0.   0.   
0.  0.  ]

我尝试了numpy.reshape（input，（25,25）），但没有得到我想要的结果。任何帮助表示赞赏！

Answer 1

在重塑之前，请使用swapaxes（或transpose）重新排列轴的顺序：

In [48]: y = x.swapaxes(1,2).reshape(25,25)

In [49]: y[0]
Out[49]: 
array([0.64, 0.16, 0.  , 0.  , 0.  , 0.16, 0.04, 0.  , 0.  , 0.  , 0.  ,
       0.  , 0.  , 0.  , 0.  , 0.  , 0.  , 0.  , 0.  , 0.  , 0.  , 0.  ,
       0.  , 0.  , 0.  ])

In [50]: y[5]
Out[50]: 
array([0.  , 0.  , 0.  , 0.  , 0.  , 0.64, 0.16, 0.  , 0.  , 0.  , 0.16,
       0.04, 0.  , 0.  , 0.  , 0.  , 0.  , 0.  , 0.  , 0.  , 0.  , 0.  ,
       0.  , 0.  , 0.  ])

将4D numpy数组重塑为2D

1 个答案: