mx.nd.space.to.depth
¶
Description¶
Rearranges(permutes) blocks of spatial data into depth.
Similar to ONNX SpaceToDepth operator:
https://github.com/onnx/onnx/blob/master/docs/Operators.md#SpaceToDepth
The output is a new tensor where the values from height and width dimension are
moved to the depth dimension. The reverse of this operation is depth_to_space
.
.. math::
begin{gather*}
x prime = reshape(x, [N, C, H / block_size, block_size, W / block_size, block_size]) \
x prime prime = transpose(x prime, [0, 3, 5, 1, 2, 4]) \
y = reshape(x prime prime, [N, C * (block_size ^ 2), H / block_size, W / block_size])
end{gather*}
[batch, channels, height, width]
and \(y\) is the output tensor of layout \([N, C * (block\_size ^ 2), H / block\_size, W / block\_size]\)
Defined in src/operator/tensor/matrix_op.cc:L1019
Example:
x = [[[[0, 6, 1, 7, 2, 8],
[12, 18, 13, 19, 14, 20],
[3, 9, 4, 10, 5, 11],
[15, 21, 16, 22, 17, 23]]]]
space_to_depth(x, 2) = [[[[0, 1, 2],
[3, 4, 5]],
[[6, 7, 8],
[9, 10, 11]],
[[12, 13, 14],
[15, 16, 17]],
[[18, 19, 20],
[21, 22, 23]]]]
Arguments¶
Argument |
Description |
---|---|
|
NDArray-or-Symbol. Input ndarray |
|
int, required. Blocks of [block_size. block_size] are moved |
Value¶
out
The result mx.ndarray