BatchToSpaceNd

public final class BatchToSpaceNd

BatchToSpace for N-D tensors of type T.

This operation reshapes the "batch" dimension 0 into `M + 1` dimensions of shape `block_shape + [batch]`, interleaves these blocks back into the grid defined by the spatial dimensions `[1, ..., M]`, to obtain a result with the same rank as the input. The spatial dimensions of this intermediate result are then optionally cropped according to `crops` to produce the output. This is the reverse of SpaceToBatch. See below for a precise description.

Public Methods

Output<T>
asOutput()
Returns the symbolic handle of a tensor.
static <T, U extends Number, V extends Number> BatchToSpaceNd<T>
create(Scope scope, Operand<T> input, Operand<U> blockShape, Operand<V> crops)
Factory method to create a class wrapping a new BatchToSpaceNd operation.
Output<T>
output()

Inherited Methods

Public Methods

public Output<T> asOutput ()

Returns the symbolic handle of a tensor.

Inputs to TensorFlow operations are outputs of another TensorFlow operation. This method is used to obtain a symbolic handle that represents the computation of the input.

public static BatchToSpaceNd<T> create (Scope scope, Operand<T> input, Operand<U> blockShape, Operand<V> crops)

Factory method to create a class wrapping a new BatchToSpaceNd operation.

Parameters
scope current scope
input N-D with shape `input_shape = [batch] + spatial_shape + remaining_shape`, where spatial_shape has M dimensions.
blockShape 1-D with shape `[M]`, all values must be >= 1.
crops 2-D with shape `[M, 2]`, all values must be >= 0. `crops[i] = [crop_start, crop_end]` specifies the amount to crop from input dimension `i + 1`, which corresponds to spatial dimension `i`. It is required that `crop_start[i] + crop_end[i] <= block_shape[i] * input_shape[i + 1]`.

This operation is equivalent to the following steps:

1. Reshape `input` to `reshaped` of shape: [block_shape[0], ..., block_shape[M-1], batch / prod(block_shape), input_shape[1], ..., input_shape[N-1]]

2. Permute dimensions of `reshaped` to produce `permuted` of shape [batch / prod(block_shape),

input_shape[1], block_shape[0], ..., input_shape[M], block_shape[M-1],

input_shape[M+1], ..., input_shape[N-1]]

3. Reshape `permuted` to produce `reshaped_permuted` of shape [batch / prod(block_shape),

input_shape[1] * block_shape[0], ..., input_shape[M] * block_shape[M-1],

input_shape[M+1], ..., input_shape[N-1]]

4. Crop the start and end of dimensions `[1, ..., M]` of `reshaped_permuted` according to `crops` to produce the output of shape: [batch / prod(block_shape),

input_shape[1] * block_shape[0] - crops[0,0] - crops[0,1], ..., input_shape[M] * block_shape[M-1] - crops[M-1,0] - crops[M-1,1],

input_shape[M+1], ..., input_shape[N-1]]

Some examples:

(1) For the following input of shape `[4, 1, 1, 1]`, `block_shape = [2, 2]`, and `crops = [[0, 0], [0, 0]]`: 

[[[[1]]], [[[2]]], [[[3]]], [[[4]]]]
The output tensor has shape `[1, 2, 2, 1]` and value: 
x = [[[[1], [2]], [[3], [4]]]]
(2) For the following input of shape `[4, 1, 1, 3]`, `block_shape = [2, 2]`, and `crops = [[0, 0], [0, 0]]`: 
[[[[1, 2, 3]]], [[[4, 5, 6]]], [[[7, 8, 9]]], [[[10, 11, 12]]]]
The output tensor has shape `[1, 2, 2, 3]` and value: 
x = [[[[1, 2, 3], [4, 5, 6]],
       [[7, 8, 9], [10, 11, 12]]]]
(3) For the following input of shape `[4, 2, 2, 1]`, `block_shape = [2, 2]`, and `crops = [[0, 0], [0, 0]]`: 
x = [[[[1], [3]], [[9], [11]]],
      [[[2], [4]], [[10], [12]]],
      [[[5], [7]], [[13], [15]]],
      [[[6], [8]], [[14], [16]]]]
The output tensor has shape `[1, 4, 4, 1]` and value: 
x = [[[[1],   [2],  [3],  [4]],
      [[5],   [6],  [7],  [8]],
      [[9],  [10], [11],  [12]],
      [[13], [14], [15],  [16]]]]
(4) For the following input of shape `[8, 1, 3, 1]`, `block_shape = [2, 2]`, and `crops = [[0, 0], [2, 0]]`: 
x = [[[[0], [1], [3]]], [[[0], [9], [11]]],
      [[[0], [2], [4]]], [[[0], [10], [12]]],
      [[[0], [5], [7]]], [[[0], [13], [15]]],
      [[[0], [6], [8]]], [[[0], [14], [16]]]]
The output tensor has shape `[2, 2, 4, 1]` and value: 
x = [[[[1],   [2],  [3],  [4]],
       [[5],   [6],  [7],  [8]]],
      [[[9],  [10], [11],  [12]],
       [[13], [14], [15],  [16]]]]

Returns
  • a new instance of BatchToSpaceNd

public Output<T> output ()