mindspore.ops.BatchToSpace

class mindspore.ops.BatchToSpace(*args, **kwargs)[source]

Divides batch dimension with blocks and interleaves these blocks back into spatial dimensions.

This operation will divide batch dimension N into blocks with block_size, the output tensor’s N dimension is the corresponding number of blocks after division. The output tensor’s H, W dimension is product of original H, W dimension and block_size with given amount to crop from dimension, respectively.

Parameters

  • block_size (int) – The block size of division, has the value not less than 2.

  • crops (Union[list(int), tuple(int)]) – The crop value for H and W dimension, containing 2 subtraction lists. Each list contains 2 integers. All values must be not less than 0. crops[i] specifies the crop values for the spatial dimension i, which corresponds to the input dimension i+2. It is required that input_shape[i+2]*block_size >= crops[i][0]+crops[i][1].

Inputs:

  • input_x (Tensor) - The input tensor. It must be a 4-D tensor, dimension 0 must be divisible by product of block_shape. The data type is float16 or float32.

Outputs:

Tensor, the output tensor with the same type as input. Assume input shape is (n, c, h, w) with block_size and crops. The output shape will be (n’, c’, h’, w’), where

\(n' = n//(block\_size*block\_size)\)

\(c' = c\)

\(h' = h*block\_size-crops[0][0]-crops[0][1]\)

\(w' = w*block\_size-crops[1][0]-crops[1][1]\)

Raises

  • TypeError – If block_size or element of crops is not an int.

  • TypeError – If crops is neither list nor tuple.

  • ValueError – If block_size is less than 2.

Supported Platforms:

Ascend

Examples

>>> block_size = 2
>>> crops = [[0, 0], [0, 0]]
>>> batch_to_space = ops.BatchToSpace(block_size, crops)
>>> input_x = Tensor(np.array([[[[1]]], [[[2]]], [[[3]]], [[[4]]]]), mindspore.float32)
>>> output = batch_to_space(input_x)
>>> print(output)
[[[[1.  2.]
   [3.  4.]]]]