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体验新版 GitCode,发现更多精彩内容 >>
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fbd1d1cf
编写于
12月 25, 2017
作者:
T
typhoonzero
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电子邮件补丁
差异文件
refine pipe_reader
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af0c4c45
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1 changed file
with
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71 deletion
+50
-71
python/paddle/v2/reader/decorator.py
python/paddle/v2/reader/decorator.py
+50
-71
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python/paddle/v2/reader/decorator.py
浏览文件 @
fbd1d1cf
...
...
@@ -334,93 +334,72 @@ def _buf2lines(buf, line_break="\n"):
return
lines
[:
-
1
],
lines
[
-
1
]
def
pipe_reader
(
left_cmd
,
parser
,
bufsize
=
8192
,
file_type
=
"plain"
,
cut_lines
=
True
,
line_break
=
"
\n
"
):
class
PipeReader
:
"""
pipe_r
eader read data by stream from a command, take it's
PipeR
eader 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:
.. code-block:: python
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
An example:
: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"
)
.. code-block:: python
# TODO(typhoonzero): add a thread to read stderr
def example_reader():
for f in myfiles:
pr = PipeReader("cat %s"%f)
for l in pr.get_line():
sample = l.split(" ")
yield sample
"""
# Always init a decompress object is better than
# create in the loop.
dec
=
zlib
.
decompressobj
(
def
__init__
(
self
,
command
,
bufsize
=
8192
,
file_type
=
"plain"
):
if
not
isinstance
(
command
,
str
):
raise
TypeError
(
"left_cmd must be a string"
)
if
file_type
==
"gzip"
:
self
.
dec
=
zlib
.
decompressobj
(
32
+
zlib
.
MAX_WBITS
)
# offset 32 to skip the header
self
.
file_type
=
file_type
self
.
bufsize
=
bufsize
self
.
process
=
subprocess
.
Popen
(
command
.
split
(
" "
),
bufsize
=
bufsize
,
stdout
=
subprocess
.
PIPE
)
def
reader
():
process
=
subprocess
.
Popen
(
left_cmd
.
split
(
" "
),
bufsize
=
bufsize
,
stdout
=
subprocess
.
PIPE
)
def
get_line
(
self
,
cut_lines
=
True
,
line_break
=
"
\n
"
):
"""
:param cut_lines: cut buffer to lines
:type cut_lines: bool
:param line_break: line break of the file, like
\n
or
\r
:type line_break: string
:return: one line or a buffer of bytes
:rtype: string
"""
remained
=
""
while
True
:
buff
=
process
.
stdout
.
read
(
bufsize
)
buff
=
self
.
process
.
stdout
.
read
(
self
.
bufsize
)
if
buff
:
if
file_type
==
"gzip"
:
decomp_buff
=
dec
.
decompress
(
buff
)
elif
file_type
==
"plain"
:
if
self
.
file_type
==
"gzip"
:
decomp_buff
=
self
.
dec
.
decompress
(
buff
)
elif
self
.
file_type
==
"plain"
:
decomp_buff
=
buff
else
:
raise
TypeError
(
"file_type %s is not allowed"
%
file_type
)
raise
TypeError
(
"file_type %s is not allowed"
%
self
.
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
for
line
in
lines
:
yield
line
else
:
for
ret
in
parser
(
decomp_buff
):
yield
ret
yield
decomp_buff
else
:
break
return
reader
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