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7fd42b8c
编写于
2月 21, 2017
作者:
H
Helin Wang
浏览文件
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浏览文件
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电子邮件补丁
差异文件
create reader creator decorators: shuffle, compose, chain
上级
ac712688
变更
2
隐藏空白更改
内联
并排
Showing
2 changed file
with
193 addition
and
17 deletion
+193
-17
python/paddle/reader/decorator.py
python/paddle/reader/decorator.py
+128
-11
python/paddle/reader/tests/decorator_test.py
python/paddle/reader/tests/decorator_test.py
+65
-6
未找到文件。
python/paddle/reader/decorator.py
浏览文件 @
7fd42b8c
...
...
@@ -12,25 +12,142 @@
# See the License for the specific language governing permissions and
# limitations under the License.
__all__
=
[
'buffered'
]
__all__
=
[
'buffered'
,
'compose'
,
'chain'
,
'shuffle'
,
'ComposeNotAligned'
]
from
Queue
import
Queue
from
threading
import
Thread
import
itertools
import
random
def
buffered
(
reader
,
size
):
"""Creates a
buffered data reader
.
def
shuffle
(
reader_creator
,
buf_
size
):
"""Creates a
data reader creator whose data output is suffled
.
The buffered data reader will read and save data entries into a buffer.
Reading from the buffered data reader will proceed as long as the buffer
is not empty.
Output from the iterator that created by original reader creator will be
buffered into shuffle buffer, and then shuffled. The size of shuffle buffer
is determined by argument buf_size.
Args:
reader_creator: the original reader creator whose output will be
shuffled.
buf_size: shuffle buffer size.
Returns:
the new reader creator whose output is shuffled.
"""
def
create_reader_creator
():
buf
=
[]
for
e
in
reader_creator
():
buf
.
append
(
e
)
if
len
(
buf
)
>=
buf_size
:
random
.
shuffle
(
buf
)
for
b
in
buf
:
yield
b
buf
=
[]
if
len
(
buf
)
>
0
:
random
.
shuffle
(
buf
)
for
b
in
buf
:
yield
b
return
create_reader_creator
def
chain
(
*
reader_creators
):
"""Creates a data reader creator whose output is the outputs of input data
reader creators chained together.
If input reader creators output following data entries:
[0, 0, 0]
[1, 1, 1]
[2, 2, 2]
The chained reader creator will output:
[0, 0, 0, 1, 1, 1, 2, 2, 2]
Args:
readers_creators: input reader creators
Returns:
the new data reader creator.
"""
def
create_reader_creator
():
rs
=
[]
for
r
in
reader_creators
:
rs
.
append
(
r
())
for
e
in
itertools
.
chain
(
*
rs
):
yield
e
return
create_reader_creator
class
ComposeNotAligned
:
pass
def
compose
(
*
reader_creators
,
**
kwargs
):
"""Creates a data reader creator whose output is the combination of input
readers creators.
If input reader creators output following data entries:
(1, 2) 3 (4, 5)
The composed reader creator will output:
(1, 2, 3, 4, 5)
Args:
*reader_creators: reader creators that will be composed together.
check_alignment: If True, will check if input reader creators are aligned
correctly. If False, will not check alignment and trailing outputs
will be discarded. Defaults to True.
Returns:
the new data reader creator.
Raises:
ComposeNotAligned: outputs of reader creators are not aligned.
Will not raise when check_alignment is set to False.
"""
check_alignment
=
kwargs
.
pop
(
'check_alignment'
,
True
)
def
make_tuple
(
x
):
if
isinstance
(
x
,
tuple
):
return
x
else
:
return
(
x
,
)
def
create_reader_creator
():
rs
=
[]
for
r
in
reader_creators
:
rs
.
append
(
r
())
if
not
check_alignment
:
for
outputs
in
itertools
.
izip
(
*
rs
):
yield
sum
(
map
(
make_tuple
,
outputs
),
())
else
:
for
outputs
in
itertools
.
izip_longest
(
*
rs
):
for
o
in
outputs
:
if
o
is
None
:
# None will be not be present if compose is aligned
raise
ComposeNotAligned
yield
sum
(
map
(
make_tuple
,
outputs
),
())
return
create_reader_creator
def
buffered
(
reader_creator
,
size
):
"""Creates a buffered data reader creator.
The buffered data reader creator will read and save data entries into a
buffer. Reading from the buffered data reader creator will proceed as long
as the buffer is not empty.
Args:
reader
: the data reade
r to read from.
reader
_creator: the data reader creato
r to read from.
size: max buffer size.
Returns:
The buffered data reader.
The buffered data reader
creator
.
"""
class
EndSignal
():
...
...
@@ -43,8 +160,8 @@ def buffered(reader, size):
q
.
put
(
d
)
q
.
put
(
end
)
def
create_reader
():
r
=
reader
()
def
create_reader
_creator
():
r
=
reader
_creator
()
q
=
Queue
(
maxsize
=
size
)
t
=
Thread
(
target
=
read_worker
,
args
=
(
...
...
@@ -57,4 +174,4 @@ def buffered(reader, size):
yield
e
e
=
q
.
get
()
return
create_reader
return
create_reader
_creator
python/paddle/reader/tests/decorator_test.py
浏览文件 @
7fd42b8c
...
...
@@ -17,15 +17,18 @@ import time
def
reader_10
(
dur
):
for
i
in
range
(
10
):
time
.
sleep
(
dur
)
yield
i
def
reader
():
for
i
in
range
(
10
):
time
.
sleep
(
dur
)
yield
i
return
reader
class
TestBuffered
(
unittest
.
TestCase
):
def
test_read
(
self
):
for
size
in
range
(
20
):
b
=
paddle
.
reader
.
buffered
(
lambda
:
reader_10
(
0
),
size
)
b
=
paddle
.
reader
.
buffered
(
reader_10
(
0
),
size
)
c
=
0
for
i
in
b
():
self
.
assertEqual
(
i
,
c
)
...
...
@@ -34,7 +37,7 @@ class TestBuffered(unittest.TestCase):
def
test_buffering
(
self
):
# read have 30ms delay.
b
=
paddle
.
reader
.
buffered
(
lambda
:
reader_10
(
0.03
),
10
)
b
=
paddle
.
reader
.
buffered
(
reader_10
(
0.03
),
10
)
last_time
=
time
.
time
()
for
idx
,
i
in
enumerate
(
b
()):
elapsed_time
=
time
.
time
()
-
last_time
...
...
@@ -42,9 +45,65 @@ class TestBuffered(unittest.TestCase):
time
.
sleep
(
0.3
)
else
:
# read time should be short, meaning already buffered.
self
.
assertLess
(
elapsed_time
,
0.0
1
)
self
.
assertLess
(
elapsed_time
,
0.0
5
)
last_time
=
time
.
time
()
class
TestCompose
(
unittest
.
TestCase
):
def
test_compse
(
self
):
a
=
reader_10
(
0
)
b
=
reader_10
(
0
)
c
=
paddle
.
reader
.
compose
(
a
,
b
)
for
idx
,
e
in
enumerate
(
c
()):
self
.
assertEqual
(
e
,
(
idx
,
idx
))
def
test_compose_not_aligned
(
self
):
a
=
reader_10
(
0
)
b
=
paddle
.
reader
.
chain
(
a
,
a
)
c
=
paddle
.
reader
.
compose
(
a
,
b
)
total
=
0
with
self
.
assertRaises
(
paddle
.
reader
.
ComposeNotAligned
):
for
e
in
c
():
total
+=
1
# expecting 10, not 20
self
.
assertEqual
(
total
,
10
)
def
test_compose_not_aligned_no_check
(
self
):
a
=
reader_10
(
0
)
b
=
paddle
.
reader
.
chain
(
a
,
a
)
c
=
paddle
.
reader
.
compose
(
a
,
b
,
check_alignment
=
False
)
total
=
0
for
e
in
c
():
total
+=
1
# expecting 10, not 20
self
.
assertEqual
(
total
,
10
)
class
TestChain
(
unittest
.
TestCase
):
def
test_chain
(
self
):
a
=
reader_10
(
0
)
b
=
reader_10
(
0
)
c
=
paddle
.
reader
.
chain
(
a
,
b
)
idx
=
0
for
e
in
c
():
self
.
assertEqual
(
e
,
idx
%
10
)
idx
+=
1
self
.
assertEqual
(
idx
,
20
)
class
TestShuffle
(
unittest
.
TestCase
):
def
test_shuffle
(
self
):
case
=
[(
0
,
True
),
(
1
,
True
),
(
10
,
False
),
(
100
,
False
)]
a
=
reader_10
(
0
)
for
size
,
checkEq
in
case
:
s
=
paddle
.
reader
.
shuffle
(
a
,
size
)
total
=
0
for
idx
,
e
in
enumerate
(
s
()):
if
checkEq
:
self
.
assertEqual
(
idx
,
e
)
total
+=
1
self
.
assertEqual
(
total
,
10
)
if
__name__
==
'__main__'
:
unittest
.
main
()
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