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体验新版 GitCode,发现更多精彩内容 >>
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bf0ec9b8
编写于
4月 21, 2021
作者:
A
AshburnLee
提交者:
GitHub
4月 21, 2021
浏览文件
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电子邮件补丁
差异文件
Add Bfloat16 support on Ampere GPU with CUDA 11 (#32132)
上级
b47dd158
变更
3
隐藏空白更改
内联
并排
Showing
3 changed file
with
166 addition
and
0 deletion
+166
-0
paddle/fluid/platform/CMakeLists.txt
paddle/fluid/platform/CMakeLists.txt
+1
-0
paddle/fluid/platform/bfloat16.h
paddle/fluid/platform/bfloat16.h
+41
-0
paddle/fluid/platform/bfloat16_test.cu
paddle/fluid/platform/bfloat16_test.cu
+124
-0
未找到文件。
paddle/fluid/platform/CMakeLists.txt
浏览文件 @
bf0ec9b8
...
...
@@ -190,6 +190,7 @@ cc_test(bfloat16_test SRCS bfloat16_test.cc DEPS lod_tensor)
IF
(
WITH_GPU
)
nv_test
(
float16_gpu_test SRCS float16_test.cu DEPS lod_tensor
)
nv_test
(
bfloat16_gpu_test SRCS bfloat16_test.cu DEPS lod_tensor
)
nv_test
(
test_limit_gpu_memory SRCS test_limit_gpu_memory.cu DEPS gpu_info flags
)
nv_library
(
cuda_device_guard SRCS cuda_device_guard.cc DEPS gpu_info
)
ENDIF
()
...
...
paddle/fluid/platform/bfloat16.h
浏览文件 @
bf0ec9b8
...
...
@@ -21,6 +21,15 @@
#include <iostream>
#include <limits>
#ifdef PADDLE_WITH_CUDA
#include <cuda.h>
#endif
#if defined(__CUDACC__) && CUDA_VERSION >= 11000
#define PADDLE_CUDA_BF16
#include <cuda_bf16.h>
#endif
#if !defined(_WIN32)
#define PADDLE_ALIGN(x) __attribute__((aligned(x)))
#else
...
...
@@ -44,6 +53,7 @@ struct PADDLE_ALIGN(2) bfloat16 {
public:
uint16_t
x
;
// Constructors
bfloat16
()
=
default
;
bfloat16
(
const
bfloat16
&
o
)
=
default
;
bfloat16
&
operator
=
(
const
bfloat16
&
o
)
=
default
;
...
...
@@ -60,15 +70,34 @@ struct PADDLE_ALIGN(2) bfloat16 {
tempRes
=
reinterpret_cast
<
uint32_t
*>
(
&
val
);
res
=
*
tempRes
;
x
=
res
>>
16
;
#else
#if defined(PADDLE_CUDA_BF16)
__nv_bfloat16
tmp
=
__float2bfloat16
(
val
);
x
=
*
reinterpret_cast
<
uint16_t
*>
(
&
tmp
);
#else
std
::
memcpy
(
&
x
,
reinterpret_cast
<
char
*>
(
&
val
)
+
2
,
2
);
#endif
#endif
}
#if defined(PADDLE_CUDA_BF16)
HOSTDEVICE
inline
explicit
bfloat16
(
const
__nv_bfloat16
&
val
)
{
x
=
*
reinterpret_cast
<
const
unsigned
short
*>
(
&
val
);
}
#endif
template
<
class
T
>
HOSTDEVICE
inline
explicit
bfloat16
(
const
T
&
val
)
:
x
(
bfloat16
(
static_cast
<
float
>
(
val
)).
x
)
{}
// Assignment operators
#if defined(PADDLE_CUDA_BF16)
HOSTDEVICE
inline
bfloat16
&
operator
=
(
const
__nv_bfloat16
&
val
)
{
x
=
*
reinterpret_cast
<
const
unsigned
short
*>
(
&
val
);
return
*
this
;
}
#endif
HOSTDEVICE
inline
bfloat16
&
operator
=
(
bool
b
)
{
x
=
b
?
0x3f80
:
0
;
return
*
this
;
...
...
@@ -124,13 +153,24 @@ struct PADDLE_ALIGN(2) bfloat16 {
return
*
this
;
}
// Conversion opertors
HOSTDEVICE
inline
explicit
operator
float
()
const
{
#ifdef PADDLE_CUDA_BF16
return
__bfloat162float
(
*
reinterpret_cast
<
const
__nv_bfloat16
*>
(
&
x
));
#else
float
val
=
0.
f
;
uint16_t
temp
=
x
;
memcpy
(
reinterpret_cast
<
char
*>
(
&
val
)
+
2
,
reinterpret_cast
<
char
*>
(
&
temp
),
2
);
return
val
;
#endif
}
#ifdef PADDLE_CUDA_BF16
HOSTDEVICE
inline
explicit
operator
__nv_bfloat16
()
const
{
return
*
reinterpret_cast
<
const
__nv_bfloat16
*>
(
&
x
);
}
#endif
HOSTDEVICE
inline
explicit
operator
bool
()
const
{
return
(
x
&
0x7fff
)
!=
0
;
}
...
...
@@ -223,6 +263,7 @@ HOSTDEVICE inline bfloat16 raw_uint16_to_bfloat16(uint16_t a) {
return
res
;
}
// Comparison operators
HOSTDEVICE
inline
bool
operator
==
(
const
bfloat16
&
a
,
const
bfloat16
&
b
)
{
return
static_cast
<
float
>
(
a
)
==
static_cast
<
float
>
(
b
);
}
...
...
paddle/fluid/platform/bfloat16_test.cu
0 → 100644
浏览文件 @
bf0ec9b8
/* Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
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 "paddle/fluid/platform/bfloat16.h"
#define GLOG_NO_ABBREVIATED_SEVERITIES // msvc conflict logging with windows.h
#include <glog/logging.h>
#include <gtest/gtest.h>
#include <iostream>
#include "paddle/fluid/framework/lod_tensor.h"
#if defined(PADDLE_CUDA_BF16)
namespace
paddle
{
namespace
platform
{
TEST
(
bfloat16
,
convert_float32_to_bfloat16_on_gpu
)
{
// Convert float32 to bfloat16
EXPECT_EQ
((
bfloat16
(
1.0
f
)).
x
,
0x3f80
);
EXPECT_EQ
((
bfloat16
(
0.5
f
)).
x
,
0x3f00
);
EXPECT_EQ
((
bfloat16
(
0.33333
f
)).
x
,
0x3eab
);
EXPECT_EQ
((
bfloat16
(
0.0
f
)).
x
,
0x0000
);
EXPECT_EQ
((
bfloat16
(
-
0.0
f
)).
x
,
0x8000
);
EXPECT_EQ
((
bfloat16
(
65536.0
f
)).
x
,
0x4780
);
}
TEST
(
bfloat16
,
assignment_operator_on_gpu
)
{
// Assignment operator
bfloat16
v_assign
;
v_assign
=
nv_bfloat16
(
bfloat16
(
1.0
f
));
EXPECT_EQ
(
v_assign
.
x
,
0x3f80
);
v_assign
=
0.33333
;
EXPECT_EQ
(
v_assign
.
x
,
0x3eab
);
}
TEST
(
bfloat16
,
convert_bfloat16_to_float32_on_gpu
)
{
// Conversion operator
EXPECT_EQ
(
static_cast
<
float
>
(
bfloat16
(
0.5
f
)),
0.5
f
);
EXPECT_NEAR
(
static_cast
<
double
>
(
bfloat16
(
0.33333
)),
0.33333
,
0.01
);
EXPECT_EQ
(
static_cast
<
int
>
(
bfloat16
(
-
1
)),
-
1
);
EXPECT_EQ
(
static_cast
<
bool
>
(
bfloat16
(
true
)),
true
);
}
TEST
(
bfloat16
,
lod_tensor_on_gpu
)
{
framework
::
LoDTensor
src_tensor
;
framework
::
LoDTensor
gpu_tensor
;
framework
::
LoDTensor
dst_tensor
;
bfloat16
*
src_ptr
=
src_tensor
.
mutable_data
<
bfloat16
>
(
framework
::
make_ddim
({
2
,
2
}),
CPUPlace
());
bfloat16
arr
[
4
]
=
{
bfloat16
(
1.0
f
),
bfloat16
(
0.5
f
),
bfloat16
(
0.33333
f
),
bfloat16
(
0.0
f
)};
memcpy
(
src_ptr
,
arr
,
4
*
sizeof
(
bfloat16
));
// CPU LoDTensor to GPU LoDTensor
CUDAPlace
gpu_place
(
0
);
CUDADeviceContext
gpu_ctx
(
gpu_place
);
framework
::
TensorCopy
(
src_tensor
,
gpu_place
,
gpu_ctx
,
&
gpu_tensor
);
// GPU LoDTensor to CPU LoDTensor
framework
::
TensorCopy
(
gpu_tensor
,
CPUPlace
(),
gpu_ctx
,
&
dst_tensor
);
// Sync before comparing LoDTensors
gpu_ctx
.
Wait
();
const
bfloat16
*
dst_ptr
=
dst_tensor
.
data
<
bfloat16
>
();
ASSERT_NE
(
src_ptr
,
dst_ptr
);
for
(
size_t
i
=
0
;
i
<
4
;
++
i
)
{
EXPECT_EQ
(
src_ptr
[
i
].
x
,
dst_ptr
[
i
].
x
);
}
}
TEST
(
bfloat16
,
isinf
)
{
bfloat16
a
;
a
.
x
=
0x7f80
;
bfloat16
b
=
bfloat16
(
INFINITY
);
bfloat16
c
=
static_cast
<
bfloat16
>
(
INFINITY
);
EXPECT_EQ
(
std
::
isinf
(
a
),
true
);
EXPECT_EQ
(
std
::
isinf
(
b
),
true
);
EXPECT_EQ
(
std
::
isinf
(
c
),
true
);
}
TEST
(
bfloat16
,
isnan
)
{
bfloat16
a
;
a
.
x
=
0x7fff
;
bfloat16
b
=
bfloat16
(
NAN
);
bfloat16
c
=
static_cast
<
bfloat16
>
(
NAN
);
EXPECT_EQ
(
std
::
isnan
(
a
),
true
);
EXPECT_EQ
(
std
::
isnan
(
b
),
true
);
EXPECT_EQ
(
std
::
isnan
(
c
),
true
);
}
TEST
(
bfloat16
,
cast
)
{
bfloat16
a
;
a
.
x
=
0x0070
;
auto
b
=
a
;
{
// change semantic, keep the same value
bfloat16
c
=
reinterpret_cast
<
bfloat16
&>
(
reinterpret_cast
<
unsigned
&>
(
b
));
EXPECT_EQ
(
b
,
c
);
}
{
// use uint32 low 16 bit store float16
uint32_t
c
=
reinterpret_cast
<
uint32_t
&>
(
b
);
bfloat16
d
;
d
.
x
=
c
;
EXPECT_EQ
(
b
,
d
);
}
}
}
// namespace platform
}
// namespace paddle
#endif
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