MEGAM: /usr/lib/python2.7/subprocess.py OSError: [Errno 13] Permission denied

[Marco Ippolito]

Hi everybody,

thanks to hints of Alex and others, I was able to "import" MEGAM file and run without memory shortages.

But now the output is:

Traceback (most recent call last):

  File "classifying.py", line 492, in <module>

    me_classifier = MaxentClassifier.train(train_feats, algorithm='megam')

  File "/usr/local/lib/python2.7/dist-packages/nltk/classify/maxent.py", line 319, in train

    gaussian_prior_sigma, **cutoffs)

  File "/usr/local/lib/python2.7/dist-packages/nltk/classify/maxent.py", line 1522, in train_maxent_classifier_with_megam

    stdout = call_megam(options)

  File "/usr/local/lib/python2.7/dist-packages/nltk/classify/megam.py", line 167, in call_megam

    p = subprocess.Popen(cmd, stdout=subprocess.PIPE)

  File "/usr/lib/python2.7/subprocess.py", line 679, in __init__

    errread, errwrite)

  File "/usr/lib/python2.7/subprocess.py", line 1249, in _execute_child

    raise child_exception

OSError: [Errno 13] Permission denied

Any hints to solve it?

Thanks in advance.

Marco

[Alex Rudnick]

Hey Marco!

Did you figure it out?

One possibility is that your script doesn't have permission to execute
the megam binary -- does it have the execute bit set? I get a similar
error when I try to use subprocess to call a binary with the execute
bits turned off.

Consider going:
$ chmod ugo+rx /path/to/megam

Let us know whether this helps!

--
-- alexr

[Marco Ippolito]

Hi Alex,
thank you for your kind helpfull suggestion.

After changing megam permissions through:
$chmod ugo+rx ~/nltk_data/megam_i686.opt

-rwxrwxr-x 1 ubuntu ubuntu 977748 Oct 8 2007 megam_i686.opt

The error changed from being "permission denied" to being "no such
file or directory":

[Found /home/ubuntu/nltk_data/megam_i686.opt:
/home/ubuntu/nltk_data/megam_i686.opt]

Traceback (most recent call last):

File "classifying.py", line 494, in <module>

me_classifier = MaxentClassifier.train(train_feats, algorithm='megam')
File "/usr/local/lib/python2.7/dist-packages/nltk/classify/maxent.py",
line 319, in train
gaussian_prior_sigma, **cutoffs)
File "/usr/local/lib/python2.7/dist-packages/nltk/classify/maxent.py",
line 1522, in train_maxent_classifier_with_megam
stdout = call_megam(options)
File "/usr/local/lib/python2.7/dist-packages/nltk/classify/megam.py",
line 167, in call_megam
p = subprocess.Popen(cmd, stdout=subprocess.PIPE)
File "/usr/lib/python2.7/subprocess.py", line 679, in __init__
errread, errwrite)
File "/usr/lib/python2.7/subprocess.py", line 1249, in _execute_child
raise child_exception

OSError: [Errno 2] No such file or directory

Any other suggestions?

Thank you very much for your help.

Marco

2014/1/6 Alex Rudnick <alex.r...@gmail.com>:

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[Marco Ippolito]

Hi Alex and hi everybody,
to integrate my previous post, subprocess.py exists:

# subprocess - Subprocesses with accessible I/O streams
#
# For more information about this module, see PEP 324.
#
# This module should remain compatible with Python 2.2, see PEP 291.
#
# Copyright (c) 2003-2005 by Peter Astrand <ast...@lysator.liu.se>
#
# Licensed to PSF under a Contributor Agreement.
# See http://www.python.org/2.4/license for licensing details.

r"""subprocess - Subprocesses with accessible I/O streams


Any ideas?

Kind regards
Marco

2014/1/6 Marco Ippolito <ippolit...@gmail.com>:

[Marco Ippolito]

Hi Alex and everybody,

following the indications here: http://stackoverflow.com/questions/13786797/python-subprocess-call-no-such-file-or-directory

I added to my code these lines:

import subprocess

subprocess.call(["/usr/local/lib/python2.7/dist-packages/nltk/classify/maxent.py","/usr/local/lib/pyth\

on2.7/dist-packages/nltk/classify/megam.py","/home/ubuntu/nltk_data/megam_i686.opt"])

but now running the file the result is:

  File "classifying.py", line 496, in <module>

    subprocess.call(["/usr/local/lib/python2.7/dist-packages/nltk/classify/maxent.py","/usr/local/lib/python2.7/dist-packages/nltk/classify/megam.py","/home/ubuntu/nltk_data/megam_i686.opt"])

  File "/usr/lib/python2.7/subprocess.py", line 493, in call

    return Popen(*popenargs, **kwargs).wait()

  File "/usr/lib/python2.7/subprocess.py", line 679, in __init__

    errread, errwrite)

  File "/usr/lib/python2.7/subprocess.py", line 1249, in _execute_child

    raise child_exception

OSError: [Errno 13] Permission denied

even if:

-rwxrwxr-x 1 ubuntu ubuntu  977748 Oct  8  2007 megam_i686.opt

Any more suggestions?

Kind regards.

Marco

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[Mirko Otto]

Hello,

ok I think nltk can not find the executable file because you have not given the correct path.

megam_i686.opt is your executable file, is that correct? Then, the path should be as follows
nltk.config_megam('/home/ubuntu/nltk_data')

I think then it might work.

Cheers,

Mirko

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[Ranjeet Kumar]

Hi 

After adding 

megam_path = os.path.expanduser("/path/megma/megam_i686.opt")

nltk.config_megam(megam_path)

It  wroked.

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[tanlik...@gmail.com]

Did you ever figure out the issue? I am having the exact same problem...

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[Alexis]

I don't know what the original problem was (or yours), but this call to subprocess is all wrong. The first argument must be the name of an *executable* in your PATH (or a full path), i.e. "python", "/usr/bin/python3", etc. 

If your nltk can't find the megam binary, use nltk.classify.megam.config_megam("/path/to/megam") to tell it where it is. 

If you have a different problem, please ask here properly by describing your set-up, what you're trying to do, and the problem you're having.

Alexis

Dr. Alexis Dimitriadis | Assistant Professor and Senior Research Fellow | Utrecht Institute of Linguistics OTS | Utrecht University | Trans 10, 3512 JK Utrecht, room 2.33 | +31 30 253 65 68 | a.dimi...@uu.nl | www.hum.uu.nl/medewerkers/a.dimitriadis

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