mindspore.ops.BatchToSpaceND

class mindspore.ops.BatchToSpaceND(*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_shape, 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_shape with given amount to crop from dimension, respectively.

Parameters

  • block_shape (Union[list(int), tuple(int), int]) – The block shape of dividing block with all value greater than 1. If block_shape is a tuple or list, the length of block_shape is M corresponding to the number of spatial dimensions. If block_shape is a int, the block size of M dimendions are the same, equal to block_shape. M must be 2.

  • crops (Union[list(int), tuple(int)]) – The crop value for H and W dimension, containing 2 subtraction list, each containing 2 int value. All values must be >= 0. crops[i] specifies the crop values for spatial dimension i, which corresponds to input dimension i+2. It is required that input_shape[i+2]*block_shape[i] > 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.

Outputs:

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

\(n' = n//(block\_shape[0]*block\_shape[1])\)

\(c' = c\)

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

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

Raises

  • TypeError – If block_shape is not one of list, tuple, int.

  • TypeError – If crops is neither list nor tuple.

  • ValueError – If length of block_shape or crops is not equal to 2.

Supported Platforms:

Ascend

Examples

>>> block_shape = [2, 2]
>>> crops = [[0, 0], [0, 0]]
>>> batch_to_space_nd = ops.BatchToSpaceND(block_shape, crops)
>>> input_x = Tensor(np.array([[[[1]]], [[[2]]], [[[3]]], [[[4]]]]), mindspore.float32)
>>> output = batch_to_space_nd(input_x)
>>> print(output)
[[[[1.  2.]
   [3.  4.]]]]