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# tf.space_to_batch

```tf.space_to_batch(
input,
paddings,
block_size,
name=None
)
```

Defined in `tensorflow/python/ops/array_ops.py`.

See the guide: Tensor Transformations > Slicing and Joining

SpaceToBatch for 4-D tensors of type T.

This is a legacy version of the more general SpaceToBatchND.

Zero-pads and then rearranges (permutes) blocks of spatial data into batch. More specifically, this op outputs a copy of the input tensor where values from the `height` and `width` dimensions are moved to the `batch` dimension. After the zero-padding, both `height` and `width` of the input must be divisible by the block size.

#### Args:

• `input`: A `Tensor`. 4-D with shape `[batch, height, width, depth]`.
• `paddings`: A `Tensor`. Must be one of the following types: `int32`, `int64`. 2-D tensor of non-negative integers with shape `[2, 2]`. It specifies the padding of the input with zeros across the spatial dimensions as follows:

```paddings = [[pad_top, pad_bottom], [pad_left, pad_right]]
```

The effective spatial dimensions of the zero-padded input tensor will be:

```height_pad = pad_top + height + pad_bottom
width_pad = pad_left + width + pad_right
```

The attr `block_size` must be greater than one. It indicates the block size.

• Non-overlapping blocks of size `block_size x block size` in the height and width dimensions are rearranged into the batch dimension at each location.
• The batch of the output tensor is `batch * block_size * block_size`.
• Both height_pad and width_pad must be divisible by block_size.

The shape of the output will be:

```[batch*block_size*block_size, height_pad/block_size, width_pad/block_size,
depth]
```

Some examples:

(1) For the following input of shape `[1, 2, 2, 1]` and block_size of 2:

`x = [[[, ], [, ]]]`

The output tensor has shape `[4, 1, 1, 1]` and value:

`[[[]], [[]], [[]], [[]]]`

(2) For the following input of shape `[1, 2, 2, 3]` and block_size of 2:

`x = [[[[1, 2, 3], [4, 5, 6]], [[7, 8, 9], [10, 11, 12]]]]`

The output tensor has shape `[4, 1, 1, 3]` and value:

`[[[1, 2, 3]], [[4, 5, 6]], [[7, 8, 9]], [[10, 11, 12]]]`

(3) For the following input of shape `[1, 4, 4, 1]` and block_size of 2:

`x = [[[, , , ], [, , , ], [, , , ], [, , , ]]]`

The output tensor has shape `[4, 2, 2, 1]` and value:

`x = [[[, ], [, ]], [[, ], [, ]], [[, ], [, ]], [[, ], [, ]]]`

(4) For the following input of shape `[2, 2, 4, 1]` and block_size of 2:

`x = [[[, , , ], [, , , ]], [[, , , ], [, , , ]]]`

The output tensor has shape `[8, 1, 2, 1]` and value:

`x = [[[, ]], [[, ]], [[, ]], [[, ]], [[, ]], [[, ]], [[, ]], [[, ]]]`

Among others, this operation is useful for reducing atrous convolution into regular convolution. `block_size`: An `int` that is `>= 2`. `name`: A name for the operation (optional).

#### Returns:

A `Tensor`. Has the same type as `input`.

© 2018 The TensorFlow Authors. All rights reserved.
Licensed under the Creative Commons Attribution License 3.0.
Code samples licensed under the Apache 2.0 License.
https://www.tensorflow.org/api_docs/python/tf/space_to_batch