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0cca0fcf
编写于
8月 01, 2017
作者:
H
hedaoyuan
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Add SliceProjection.
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paddle/gserver/layers/SliceProjection.cpp
paddle/gserver/layers/SliceProjection.cpp
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paddle/gserver/layers/SliceProjection.cpp
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/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License. */
#include "Projection.h"
namespace
paddle
{
/**
* SliceProjection can slice the input value into multiple parts,
* and then select some of them to merge into a new output.
*
* First, calculate the slices that need to be merged into the output.
* slices = input.slices().for_output()
*
* Second, merge each slice into the output.
* for(auto slice: slices) {
* out.addAtOffset(slice, offset);
* }
*
* Input slices as output: s0, s1, ...:
* -----------------------
* |///| |//////| |
* |/s0| |//s1//| |
* |///| |//////| |
* -----------------------
* Output, merge s0, s1, ... into one output:
* ----------------
* |///|//////| |
* |/s0|//s1//|...|
* |///|//////| |
* ----------------
*
* The config file api is slice_projection.
*/
class
SliceProjection
:
public
Projection
{
public:
SliceProjection
(
const
ProjectionConfig
&
config
,
const
ParameterPtr
&
parameter
,
bool
useGpu
);
virtual
void
forward
();
virtual
void
backward
(
const
UpdateCallback
&
callback
);
protected:
std
::
vector
<
std
::
pair
<
size_t
,
size_t
>>
slices_
;
};
REGISTER_PROJECTION
(
slice
,
SliceProjection
);
/**
* Constructed function.
* @note SliceProjection should not have any parameter.
*/
SliceProjection
::
SliceProjection
(
const
ProjectionConfig
&
config
,
const
ParameterPtr
&
parameter
,
bool
useGpu
)
:
Projection
(
config
,
parameter
,
useGpu
)
{
CHECK
(
!
parameter
)
<<
"'slice' projection should not have any parameter"
;
slices_
.
reserve
(
config
.
slices_size
());
for
(
const
auto
&
slice
:
config
.
slices
())
{
slices_
.
push_back
(
std
::
make_pair
(
slice
.
start
(),
slice
.
end
()));
}
}
void
SliceProjection
::
forward
()
{
size_t
offset
=
0
;
for
(
auto
&
slice
:
slices_
)
{
auto
slice_out
=
in_
->
value
->
subColMatrix
(
slice
.
first
,
slice
.
second
);
out_
->
value
->
addAtOffset
(
*
slice_out
,
offset
);
offset
+=
slice_out
->
getWidth
();
}
}
void
SliceProjection
::
backward
(
const
UpdateCallback
&
callback
)
{
if
(
in_
->
grad
)
{
size_t
offset
=
0
;
for
(
auto
&
slice
:
slices_
)
{
auto
slice_out
=
in_
->
grad
->
subColMatrix
(
slice
.
first
,
slice
.
second
);
slice_out
->
addAtOffset
(
*
out_
->
grad
,
config_
.
offset
());
offset
+=
slice_out
->
getWidth
();
}
}
}
}
// namespace paddle
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