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体验新版 GitCode,发现更多精彩内容 >>
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a1dc4311
编写于
7月 14, 2017
作者:
F
fengjiayi
浏览文件
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电子邮件补丁
差异文件
Refactor `Tensor::CopyFrom()`
上级
dfa46509
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
39 addition
and
22 deletion
+39
-22
paddle/framework/tensor.h
paddle/framework/tensor.h
+39
-22
未找到文件。
paddle/framework/tensor.h
浏览文件 @
a1dc4311
...
...
@@ -28,34 +28,33 @@ namespace framework {
class
Tensor
{
public:
Tensor
()
:
offset_
(
0
)
{}
Tensor
()
:
offset_
(
0
)
{
numel_
=
product
(
dims_
);
}
explicit
Tensor
(
const
DDim
&
dims
)
:
dims_
(
dims
),
offset_
(
0
)
{}
Tensor
&
operator
=
(
const
Tensor
&
src
)
=
delete
;
template
<
typename
T
>
const
T
*
data
()
const
{
PADDLE_ENFORCE
(
holder_
!=
nullptr
,
"Tenosr has not been initialized. Call Tensor::mutable_data first."
);
CheckDimsValidity
();
return
reinterpret_cast
<
const
T
*>
(
reinterpret_cast
<
uintptr_t
>
(
holder_
->
Ptr
())
+
offset_
);
}
template
<
typename
T
,
// must be POD types
typename
std
::
enable_if
<
std
::
is_pod
<
T
>
::
value
>::
type
*
=
nullptr
>
template
<
typename
T
>
T
*
mutable_data
(
DDim
dims
,
paddle
::
platform
::
Place
place
)
{
dims_
=
dims
;
set_dims
(
dims
)
;
return
mutable_data
<
T
>
(
place
);
}
template
<
typename
T
,
// must be POD types
typename
std
::
enable_if
<
std
::
is_pod
<
T
>
::
value
>::
type
*
=
nullptr
>
template
<
typename
T
>
T
*
mutable_data
(
paddle
::
platform
::
Place
place
)
{
PADDLE_ENFORCE
(
numel_
>
0
,
"Tensor::numel_ must be larger than zero to call "
"Tensor::mutable_data."
);
if
(
holder_
==
nullptr
||
!
(
holder_
->
Place
()
==
place
)
/* some versions of boost::variant don't have operator!= */
||
holder_
->
Size
()
<
product
(
dims_
)
*
sizeof
(
T
)
+
offset_
)
{
holder_
.
reset
(
new
PlaceholderImpl
<
T
>
(
place
,
product
(
dims_
)
*
sizeof
(
T
)));
||
holder_
->
Size
()
<
numel_
*
sizeof
(
T
)
+
offset_
)
{
holder_
.
reset
(
new
PlaceholderImpl
<
T
>
(
place
,
numel_
*
sizeof
(
T
)));
offset_
=
0
;
}
return
reinterpret_cast
<
T
*>
(
reinterpret_cast
<
uintptr_t
>
(
holder_
->
Ptr
())
+
...
...
@@ -63,25 +62,24 @@ class Tensor {
}
void
ShareDataFrom
(
const
Tensor
&
src
)
{
PADDLE_ENFORCE
(
src
.
holder_
!=
nullptr
,
"Can not share data from an uninitialized tensor."
);
src
.
CheckDimsValidity
();
holder_
=
src
.
holder_
;
dims_
=
src
.
dims_
;
dims_
=
src
.
dims
();
numel_
=
src
.
numel_
;
offset_
=
src
.
offset_
;
}
void
CopyFrom
(
const
Tensor
&
src
,
paddle
::
platform
::
Place
dst_place
)
{
PADDLE_ENFORCE
(
src
.
holder_
!=
nullptr
,
"Can not copy from an uninitialized tensor."
);
size_t
size
=
product
(
src
.
dims
())
*
src
.
holder_
->
TypeSize
();
src
.
CheckDimsValidity
();
size_t
size
=
src
.
numel_
*
src
.
holder_
->
TypeSize
();
holder_
.
reset
(
src
.
holder_
->
Clone
(
src
.
offset_
,
size
,
dst_place
));
dims_
=
src
.
dims
();
numel_
=
src
.
numel_
;
offset_
=
0
;
}
Tensor
Slice
(
const
int
&
begin_idx
,
const
int
&
end_idx
)
const
{
PADDLE_ENFORCE
(
holder_
!=
nullptr
,
"The sliced tenosr has not been initialized."
);
CheckDimsValidity
();
PADDLE_ENFORCE
(
begin_idx
>=
0
&&
end_idx
<=
dims_
[
0
],
"Slice index is less than zero or out of bound."
);
PADDLE_ENFORCE
(
begin_idx
<
end_idx
,
...
...
@@ -94,12 +92,22 @@ class Tensor {
}
Tensor
dst
;
dst
.
holder_
=
holder_
;
dst
.
dims_
=
dims_
;
dst
.
dims_
[
0
]
=
end_idx
-
begin_idx
;
DDim
dst_dims
=
dims_
;
dst_dims
[
0
]
=
end_idx
-
begin_idx
;
dst
.
set_dims
(
dst_dims
);
dst
.
offset_
=
offset_
+
begin_idx
*
base
*
holder_
->
TypeSize
();
return
dst
;
}
void
set_dims
(
const
DDim
&
dims
)
{
if
(
dims
==
dims_
)
{
return
;
}
dims_
=
dims
;
numel_
=
product
(
dims_
);
return
;
}
DDim
dims
()
const
{
return
dims_
;
}
private:
...
...
@@ -158,8 +166,17 @@ class Tensor {
size_t
size_
;
// size of the memory block.
};
inline
void
CheckDimsValidity
()
{
PADDLE_ENFORCE
(
holder_
!=
nullptr
,
"Tenosr holds no memory. Call Tensor::mutable_data first."
);
PADDLE_ENFORCE
(
holder_
->
Size
()
>
numel_
*
sizeof
(
T
)
+
offset_
,
"Tensor's dims_ is out of bound. Call Tensor::mutable_data "
"first to re-allocate memory."
);
}
std
::
shared_ptr
<
Placeholder
>
holder_
;
// holds the memory block if allocated.
DDim
dims_
;
int
numel_
;
// cache of `product(dims_)`
size_t
offset_
;
// marks the begin of tensor data area.
};
...
...
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