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e2e0fbd4
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体验新版 GitCode,发现更多精彩内容 >>
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e2e0fbd4
编写于
6月 26, 2017
作者:
Y
Yi Wang
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Add tesnor.h
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paddle/framework/tensor.h
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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.
*/
#pragma once
namespace
paddle
{
namespace
framework
{
class
Tensor
{
using
paddle
::
platform
::
Place
;
using
paddle
::
platform
::
get_place
;
public:
explicit
Tensor
(
DDim
dims
)
:
dims_
(
dims
),
place_
(
get_place
())
{}
explicit
Tensor
(
DDim
dims
,
Place
place
)
:
dims_
(
dims
),
place_
(
place
)
{}
template
<
typename
T
>
const
T
*
data
()
const
{
PADDLE_ASSERT
(
holder_
!=
nullptr
);
PADDLE_ASSERT
(
holder_
->
Place
()
==
place_
);
PADDLE_ASSERT
(
holder_
->
Size
()
>=
dims_
.
product
()
*
sizeof
(
T
));
return
static_cast
<
const
T
*>
(
holder
->
Ptr
());
}
template
<
typename
T
,
// must be POD types
typename
=
std
::
enable_if
<
std
::
is_pod
<
T
>
::
value
>::
type
>
T
*
mutable_data
()
{
if
(
holder_
==
nullptr
||
holder_
->
Place
()
!=
place_
||
holder_
->
Size
()
<
dims_
.
product
()
*
sizeof
(
T
))
{
holder_
.
reset
(
new
PlaceholderImpl
(
place_
,
dims
.
product
()
*
sizeof
(
T
)));
}
return
static_cast
<
T
*>
(
holder_
->
Ptr
());
}
template
<
typename
T
,
// must be POD types
typename
=
std
::
enable_if
<
std
::
is_pod
<
T
>
::
value
>::
type
>
T
*
mutable_data
(
DDim
dims
)
{
dims_
=
dims
;
return
mutable_data
<
T
>
();
}
template
<
typename
T
,
// must be POD types
typename
=
std
::
enable_if
<
std
::
is_pod
<
T
>
::
value
>::
type
>
T
*
mutable_data
(
DDim
dims
,
Place
place
)
{
dims_
=
dims
;
place_
=
place
;
return
mutable_data
<
T
>
();
}
private:
// Placeholder hides type T, so it doesn't appear as a template
// parameter of Variable.
struct
Placeholder
{
virtual
~
Placeholder
()
{}
virtual
void
*
Ptr
()
const
=
0
;
virtual
Place
Place
()
const
=
0
;
virtual
size_t
Size
()
const
=
0
;
};
template
<
typename
T
>
struct
PlaceholderImpl
:
public
Placeholder
{
PlaceholderImpl
(
Place
pl
,
size_t
size
)
:
ptr_
(
memory
::
Alloc
(
pl
,
size
),
paddle
::
memory
::
Deleter
(
pl
)),
place_
(
pl
),
size_
(
size
)
{}
virtual
void
*
Ptr
()
const
{
return
static_cast
<
void
*>
(
ptr_
.
get
());
}
virtual
size_t
Size
()
const
{
return
size_
;
}
virtual
Place
Place
()
const
{
return
place_
;
}
std
::
unique_ptr
<
T
,
memory
::
Deleter
>
ptr_
;
Place
place_
;
// record the place of ptr_.
size_t
size_
;
// size of the memory block.
};
std
::
unique_ptr
<
Placeholder
>
holder_
;
// holds the memory block if allocated.
DDim
dims_
;
// could be smallers than the holder_->Size().
paddle
::
platform
::
Place
place_
;
};
}
// namespace framework
}
// namespace paddle
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