提交 11b4471a 编写于 作者: W wanghaoshuang

Add python API for block expand op

上级 38c61053
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......@@ -493,3 +493,8 @@ swish
------
.. autofunction:: paddle.v2.fluid.layers.swish
:noindex:
block_expand
------
.. autofunction:: paddle.v2.fluid.layers.block_expand
:noindex:
......@@ -50,6 +50,7 @@ __all__ = [
'sequence_last_step',
'dropout',
'split',
'block_expand',
]
......@@ -1547,13 +1548,13 @@ def split(input, num_or_sections, dim=-1):
Args:
input (Variable): The input variable which is a Tensor or LoDTensor.
num_or_sections (int|list): If :attr:`num_or_sections` is an integer,
then the integer indicates the number of equal sized sub-tensors
that the tensor will be divided into. If :attr:`num_or_sections`
is a list of integers, the length of list indicates the number of
sub-tensors and the integers indicate the sizes of sub-tensors'
num_or_sections (int|list): If :attr:`num_or_sections` is an integer,
then the integer indicates the number of equal sized sub-tensors
that the tensor will be divided into. If :attr:`num_or_sections`
is a list of integers, the length of list indicates the number of
sub-tensors and the integers indicate the sizes of sub-tensors'
:attr:`dim` dimension orderly.
dim (int): The dimension along which to split. If :math:`dim < 0`, the
dim (int): The dimension along which to split. If :math:`dim < 0`, the
dimension to split along is :math:`rank(input) + dim`.
Returns:
......@@ -1597,3 +1598,119 @@ def split(input, num_or_sections, dim=-1):
'axis': dim
})
return outs
def block_expand(input,
block_x=1,
block_y=1,
stride_x=1,
stride_y=1,
padding_x=0,
padding_y=0,
name=None,
layer_attr=None):
"""
This op use block to scan images and convert these images to sequences.
After expanding, the number of time step are output_height * output_width
for an image, in which output_height and output_width are calculated
by below equation:
.. math::
output\_size = 1 + \
(2 * padding + img\_size - block\_size + stride - 1) / stride
And the dimension of each time step is block_y * block_x * input.channels.
Args:
input (Variable): The input should be a tensor in NCHW format.
block_x (int): The width of sub block.
block_y (int): The width of sub block.
stride_x (int): The stride size in horizontal direction.
stride_y (int): The stride size in vertical direction.
padding_x (int): The padding size in horizontal direction.
padding_y (int): The padding size in vertical direction.
name (int): The name of this layer. It is optional.
Returns:
output: The output is a LoDTensor woth shape
{input.batch_size * output_y * x,
block_y * block_x * input.channels}.
If we regard output as matrix, each row of this matrix is a step of sequence.
Examples:
As an example:
.. code-block:: text
Given:
x = [[[[ 6. 2. 1.]
[ 8. 3. 5.]
[ 0. 2. 6.]]
[[ 2. 4. 4.]
[ 6. 3. 0.]
[ 6. 4. 7.]]]
[[[ 6. 7. 1.]
[ 5. 7. 9.]
[ 2. 4. 8.]]
[[ 1. 2. 1.]
[ 1. 3. 5.]
[ 9. 0. 8.]]]]
x.dims = {2, 2, 3, 3}
And:
block_height = 2
block_width = 2
stride_height = 1
stride_width = 1
padding_height = 0
padding_width = 0
Then:
output.data = [[ 6. 2. 8. 3. 2. 4. 6. 3.]
[ 2. 1. 3. 5. 4. 4. 3. 0.]
[ 8. 3. 0. 2. 6. 3. 6. 4.]
[ 3. 5. 2. 6. 3. 0. 4. 7.]
[ 6. 7. 5. 7. 1. 2. 1. 3.]
[ 7. 1. 7. 9. 2. 1. 3. 5.]
[ 5. 7. 2. 4. 1. 3. 9. 0.]
[ 7. 9. 4. 8. 3. 5. 0. 8.]]
output.dims = {8, 9}
output.lod = [[0, 4, 8]]
The simple usage is:
.. code-block:: python
output = fluid.layers.block_expand(input=layer, stride_x=1, stride_y=1, block_x=2, block_y=2)
"""
helper = LayerHelper('block_expand', **locals())
out = helper.create_tmp_variable(dtype=helper.input_dtype())
helper.append_op(
type='block_expand',
inputs={'X': input},
outputs={'Out': out},
attrs={
'block_height': block_y,
'block_width': block_x,
'stride_height': stride_y,
'stride_width': stride_x,
'padding_height': padding_y,
'padding_width': padding_x
})
return out
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