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d89061c3
编写于
12月 02, 2017
作者:
武
武毅
提交者:
GitHub
12月 02, 2017
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Merge pull request #5282 from typhoonzero/simple_pipe_reader
Simple pipe reader for hdfs or other service
上级
9b761edc
cd365315
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
104 addition
and
3 deletion
+104
-3
python/paddle/v2/reader/decorator.py
python/paddle/v2/reader/decorator.py
+104
-3
未找到文件。
python/paddle/v2/reader/decorator.py
浏览文件 @
d89061c3
...
...
@@ -14,13 +14,16 @@
__all__
=
[
'map_readers'
,
'buffered'
,
'compose'
,
'chain'
,
'shuffle'
,
'ComposeNotAligned'
,
'firstn'
,
'xmap_readers'
'ComposeNotAligned'
,
'firstn'
,
'xmap_readers'
,
'pipe_reader'
]
from
threading
import
Thread
import
subprocess
from
Queue
import
Queue
import
itertools
import
random
from
Queue
import
Queue
from
threading
import
Thread
import
zlib
def
map_readers
(
func
,
*
readers
):
...
...
@@ -323,3 +326,101 @@ def xmap_readers(mapper, reader, process_num, buffer_size, order=False):
yield
sample
return
xreader
def
_buf2lines
(
buf
,
line_break
=
"
\n
"
):
# FIXME: line_break should be automatically configured.
lines
=
buf
.
split
(
line_break
)
return
lines
[:
-
1
],
lines
[
-
1
]
def
pipe_reader
(
left_cmd
,
parser
,
bufsize
=
8192
,
file_type
=
"plain"
,
cut_lines
=
True
,
line_break
=
"
\n
"
):
"""
pipe_reader read data by stream from a command, take it's
stdout into a pipe buffer and redirect it to the parser to
parse, then yield data as your desired format.
You can using standard linux command or call another program
to read data, from HDFS, Ceph, URL, AWS S3 etc:
cmd = "hadoop fs -cat /path/to/some/file"
cmd = "cat sample_file.tar.gz"
cmd = "curl http://someurl"
cmd = "python print_s3_bucket.py"
A sample parser:
def sample_parser(lines):
# parse each line as one sample data,
# return a list of samples as batches.
ret = []
for l in lines:
ret.append(l.split(" ")[1:5])
return ret
:param left_cmd: command to excute to get stdout from.
:type left_cmd: string
:param parser: parser function to parse lines of data.
if cut_lines is True, parser will receive list
of lines.
if cut_lines is False, parser will receive a
raw buffer each time.
parser should return a list of parsed values.
:type parser: callable
:param bufsize: the buffer size used for the stdout pipe.
:type bufsize: int
:param file_type: can be plain/gzip, stream buffer data type.
:type file_type: string
:param cut_lines: whether to pass lines instead of raw buffer
to the parser
:type cut_lines: bool
:param line_break: line break of the file, like
\n
or
\r
:type line_break: string
:return: the reader generator.
:rtype: callable
"""
if
not
isinstance
(
left_cmd
,
str
):
raise
TypeError
(
"left_cmd must be a string"
)
if
not
callable
(
parser
):
raise
TypeError
(
"parser must be a callable object"
)
process
=
subprocess
.
Popen
(
left_cmd
.
split
(
" "
),
bufsize
=
bufsize
,
stdout
=
subprocess
.
PIPE
)
# TODO(typhoonzero): add a thread to read stderr
# Always init a decompress object is better than
# create in the loop.
dec
=
zlib
.
decompressobj
(
32
+
zlib
.
MAX_WBITS
)
# offset 32 to skip the header
def
reader
():
remained
=
""
while
True
:
buff
=
process
.
stdout
.
read
(
bufsize
)
if
buff
:
if
file_type
==
"gzip"
:
decomp_buff
=
dec
.
decompress
(
buff
)
elif
file_type
==
"plain"
:
decomp_buff
=
buff
else
:
raise
TypeError
(
"file_type %s is not allowed"
%
file_type
)
if
cut_lines
:
lines
,
remained
=
_buf2lines
(
''
.
join
(
[
remained
,
decomp_buff
]),
line_break
)
parsed_list
=
parser
(
lines
)
for
ret
in
parsed_list
:
yield
ret
else
:
for
ret
in
parser
(
decomp_buff
):
yield
ret
else
:
break
return
reader
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