Questions about UBM training in SPEAR

[Qiongqiong Wang]

Hi, 

 

I have two questions about UBM training in SPEAR.

 

The first one is training UBM took extremely long time. When I used 600 hours speech data to train a UBM (256g) with SPEAR, it took me about five days. Is it normal to every one? Or I may have some mistakes in using it.

 

The second question is whether I can use UBM trained by HTK in SPEAR. I think using HTK to train the UBM with the same data will take less time than 5 days. I know in feature extraction step, SPEAR has the function of HTK Feature reader. So I would like to ask whether there is similar function in UBM training step such as HTK UBM reader?

 

Looking forward your reply! Thank you!

 

 

Regards,

Qiongqiong

[Elie Khoury]

Hello,

5 days to train a UBM with 600h of speech data looks normal if you are running the script on your local machine with a single node. One thing that could be done is to use the parallel implementation scripts (for example: bin/para_ubm_spkverif_gmm.py) that divides your time by nearly the number of nodes you have.

For now we don't have a python wrapper to read a GMM trained by HTK. This feature could be considered in the future.

Best regards,
Elie

[Qiongqiong Wang]

 Thanks for the prompt reply! 

 

I actually have tried to use the parallel implementation of GMM "$ bin/para_ubm_spkverif_gmm.py", but i met some problems. I would appreciate it if you could help me on this issue also.

 

I have tried only to replace “spkverif_gmm.py” with “para_ubm_spkverif_gmm.py” and kept the options same as the following line.  It could work but the processing time was almost same as when I just use “spkverif_gmm.py”. So I think there must be something wrong so that it actually didn’t do the process parallelly.

     $ ./bin/ para_ubm_spkverif_gmm.py \

     -d config/database/voxforge.py \

     -p config/preprocessing/energy.py \

     -f config/features/mfcc_60.py \

     -t config/tools/ubm_gmm/ubm_gmm_256G.py \

     -b ubm_gmm -z \

     --user-directory PATH/TO/USER/DIR--temp-directory PATH/TO/TEMP/DIR

 

By comparing the usages of the two commands - spkverif_gmm.py and $ bin/para_ubm_spkverif_gmm.py, I found the following different options which are only in “para_ubm_spkverif_gmm.py”:

      [-l LIMIT_TRAINING_EXAMPLES]

     [-K KMEANS_TRAINING_ITERATIONS]

     [-k KMEANS_START_ITERATION]

     [-M GMM_TRAINING_ITERATIONS]

     [-m GMM_START_ITERATION] [-n] [-C]

     [--skip-normalization] [--skip-k-means]

     [--skip-gmm]

 

I think they might be necessary for the parallel training. But I am not clear how to use them. Could you give some brief explanation and a examples? Sorry for taking your time! Thank you! 

 

Best Regards,

Qiongqiong

[Elie Khoury]

Hello,

Please check details regarding the different options using the help:

$ bin/para_ubm_spkverif_gmm.py --help

You may want to check their default values and modify them if needed.

In addition, I updated the config files and the instructions on how to run the parallel implementation (for Voxforge).

In summary, on local machine:

$ ./bin/para_ubm_spkverif_gmm.py -d config/database/voxforge.py -p config/preprocessing/energy.py \
 -f config/features/mfcc_60.py -t config/tools/ubm_gmm/ubm_gmm_256G.py -b ubm_gmm -z \
 --user-directory PATH/TO/USER/DIR --temp-directory PATH/TO/TEMP/DIR -g config/grid/para_training_local.py

$ bin/jman --local -vv run-scheduler --parallel 6

In this example, the number of nodes is 6

On SGE, you only need to type this command:

$ ./bin/para_ubm_spkverif_gmm.py -d config/database/voxforge.py -p config/preprocessing/energy.py \
 -f config/features/mfcc_60.py -t config/tools/ubm_gmm/ubm_gmm_256G.py -b ubm_gmm -z \
 --user-directory PATH/TO/USER/DIR --temp-directory PATH/TO/TEMP/DIR -g config/grid/para_training_sge.py

Probably on Voxforge database, which is a 'toy' database, you won't see the advantage of the parallel implementation. But it will be more clear when you run it on big databases such as NIST SREs.

Best regards,
Elie

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Dr. Elie Khoury
Post Doctorant
Biometric Person Recognition Group
IDIAP Research Institute (Switzerland)
Tel : +41 27 721 77 23

[Márton Makrai]

Dear Elie and All,

I would also like to use spear on a single machine, in parallel (on a custom database (created from IARPA Babel language packs for which I wrote a config file https://github.com/juditacs/hunspeech/blob/master/emLid/babel.py)). Could you please tell me where I can find this tconfig/grid/para_training_local.py file?

Thanks
Márton Makrai

[Manuel Günther]

Hi Marton,

if you are using ``bob.bio.spear`` (which I would recommend), for running in parallel on the local machine, you might use the ``--parallel N`` (where N is the number of parallel processes) option, which automatically will create a local grid queue internally.

Otherwise you'd need to create your own local grid configuration file, which should be generated in a similar way to what you get in ``tconfig/grid/para_training_local.py``.

BTW: next time, please do not dig out two year old threads, but open a new one instead, if possible.

Cheers

Manuel

[Márton Makrai]

Dear Manuel,

yes, I use bob.bio.spear. I tried the --parallel N option, and got the error bellow.
I read somewhere that this may be because the program tries to open for writing a dictionary where I don’t have the permission but I don’t know which directory this may be as I have write access for the “ sub-directory”.
Could you tell me, what the problem is?
What is tconfig/grid/para_training_local.py? Where can I find it?

Thanks
Márton

(venv)makrai@ron:/mnt/permanent/Language$ time python -m bob.bio.base.script.verify -d ~/repo/hunspeech/emLid/babel.py -p energy-2gauss -e mfcc-60 -a gmm -vvs /mnt/store/makrai/work/emLid/spear_babel/ --grid local-p4 --run-local-scheduler --nice 10
bob.bio.base@2016-08-26 10:10:34,358 -- ERROR: During the execution, an exception was raised: (sqlite3.OperationalError) unable to open database file
Traceback (most recent call last):
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/engine/base.py", line 2074, in _wrap_pool_connect
    return fn()
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/pool.py", line 376, in connect
    return _ConnectionFairy._checkout(self)
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/pool.py", line 713, in _checkout
    fairy = _ConnectionRecord.checkout(pool)
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/pool.py", line 480, in checkout
    rec = pool._do_get()
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/pool.py", line 1151, in _do_get
    return self._create_connection()
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/pool.py", line 323, in _create_connection
    return _ConnectionRecord(self)
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/pool.py", line 449, in __init__
    self.connection = self.__connect()
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/pool.py", line 607, in __connect
    connection = self.__pool._invoke_creator(self)
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/engine/strategies.py", line 97, in connect
    return dialect.connect(*cargs, **cparams)
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/engine/default.py", line 385, in connect
    return self.dbapi.connect(*cargs, **cparams)
sqlite3.OperationalError: unable to open database file

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib/python3.4/runpy.py", line 170, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/lib/python3.4/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/bob/bio/base/script/verify.py", line 453, in <module>
    main()
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/bob/bio/base/script/verify.py", line 446, in main
    verify(args, command_line_parameters)
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/bob/bio/base/script/verify.py", line 399, in verify
    retval = add_jobs(args, submitter)
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/bob/bio/base/script/verify.py", line 57, in add_jobs
    **args.grid.preprocessing_queue)
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/bob/bio/base/tools/grid.py", line 111, in submit
    **kwargs
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/gridtk/local.py", line 48, in submit
    self.lock()
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/gridtk/manager.py", line 61, in lock
    self._create()
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/gridtk/manager.py", line 86, in _create
    Base.metadata.create_all(self._engine)
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/sql/schema.py", line 3695, in create_all
    tables=tables)
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/engine/base.py", line 1855, in _run_visitor
    with self._optional_conn_ctx_manager(connection) as conn:
  File "/usr/lib/python3.4/contextlib.py", line 59, in __enter__
    return next(self.gen)
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/engine/base.py", line 1848, in _optional_conn_ctx_manager
    with self.contextual_connect() as conn:
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/engine/base.py", line 2039, in contextual_connect
    self._wrap_pool_connect(self.pool.connect, None),
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/engine/base.py", line 2078, in _wrap_pool_connect
    e, dialect, self)
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/engine/base.py", line 1405, in _handle_dbapi_exception_noconnection
    exc_info
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/util/compat.py", line 202, in raise_from_cause
    reraise(type(exception), exception, tb=exc_tb, cause=cause)
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/util/compat.py", line 185, in reraise
    raise value.with_traceback(tb)
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/engine/base.py", line 2074, in _wrap_pool_connect
    return fn()
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/pool.py", line 376, in connect
    return _ConnectionFairy._checkout(self)
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/pool.py", line 713, in _checkout
    fairy = _ConnectionRecord.checkout(pool)
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/pool.py", line 480, in checkout
    rec = pool._do_get()
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/pool.py", line 1151, in _do_get
    return self._create_connection()
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/pool.py", line 323, in _create_connection
    return _ConnectionRecord(self)
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/pool.py", line 449, in __init__
    self.connection = self.__connect()
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/pool.py", line 607, in __connect
    connection = self.__pool._invoke_creator(self)
    connection = self.__pool._invoke_creator(self)
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/engine/strategies.py", line 97, in connect
    return dialect.connect(*cargs, **cparams)
  File "/home/makrai/tool/python/venv/lib/python3.4/site-packages/sqlalchemy/engine/default.py", line 385, in connect
    return self.dbapi.connect(*cargs, **cparams)
sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) unable to open database file

[Tiago Freitas Pereira]

Hi Márton,

Usually the sqlite file is written in the same directory of bob.bio.spear project.

Just in case, try to specify this directory in a location that you are granted for writing using the option `--gridtk-database-file`or `-G`.

Have a look in ./bin/verify.py --help for more information.

Cheers

Tiago

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[Márton Makrai]

Thank you very much, in the help I learned that the default for the gridtk-database-file is in the working directory (where the python command is run), so this is solved.
Unfortunately now I get an other error.
I tried
`python -m bob.bio.base.script.verify -d ~/repo/hunspeech/emLid/babel.py -p energy-2gauss -e mfcc-60 -a gmm -vvs /mnt/store/makrai/work/emLid/spear_babel/ --nice 10 --parallel 4`
and 
`python -m bob.bio.base.script.verify -d ~/repo/hunspeech/emLid/babel.py -p energy-2gauss -e mfcc-60 -a gmm -vvs /mnt/store/makrai/work/emLid/spear_babel/ --grid local-p4 --run-local-scheduler --nice 10 --parallel 4`
and I got similar error:
```bash
(venv)makrai@ron:/mnt/store/makrai/work/emLid/spear_babel$ python -m bob.bio.base.script.verify -d ~/repo/hunspeech/emLid/babel.py -p energy-2gauss -e mfcc-60 -a gmm -vvs /mnt/store/makrai/work/emLid/spear_babel/ --nice 10 --parallel 4
gridtk@2016-08-26 12:32:04,245 -- INFO: Added job '<Job: 15 (15) [1-4:1] - 'preprocess'> | local : submitted -- '/home/makrai/tool/python/venv/lib/python3.4/site-packages/bob/bio/base/script/verify.py' -d '/home/makrai/repo/hunspeech/emLid/babel.py' -p 'energy-2gauss' -e 'mfcc-60' -a 'gmm' -vvs '/mnt/store/makrai/work/emLid/spear_babel/' --nice '10' --parallel '4' --sub-task 'preprocess' ' to the database
bob.bio.base@2016-08-26 12:32:04,263 -- INFO: submitted: job 'preprocess' with id '15' and dependencies '[]'
gridtk@2016-08-26 12:32:04,291 -- INFO: Added job '<Job: 16 (16) [1-4:1] - 'extract'> | local : submitted -- '/home/makrai/tool/python/venv/lib/python3.4/site-packages/bob/bio/base/script/verify.py' -d '/home/makrai/repo/hunspeech/emLid/babel.py' -p 'energy-2gauss' -e 'mfcc-60' -a 'gmm' -vvs '/mnt/store/makrai/work/emLid/spear_babel/' --nice '10' --parallel '4' --sub-task 'extract' ' to the database
bob.bio.base@2016-08-26 12:32:04,309 -- INFO: submitted: job 'extract' with id '16' and dependencies '[15]'
gridtk@2016-08-26 12:32:04,334 -- INFO: Added job '<Job: 17 (17)  - 'train-p'> | local : submitted -- '/home/makrai/tool/python/venv/lib/python3.4/site-packages/bob/bio/base/script/verify.py' -d '/home/makrai/repo/hunspeech/emLid/babel.py' -p 'energy-2gauss' -e 'mfcc-60' -a 'gmm' -vvs '/mnt/store/makrai/work/emLid/spear_babel/' --nice '10' --parallel '4' --sub-task 'train-projector' ' to the database
bob.bio.base@2016-08-26 12:32:04,351 -- INFO: submitted: job 'train-p' with id '17' and dependencies '[15, 16]'
gridtk@2016-08-26 12:32:04,383 -- INFO: Added job '<Job: 18 (18) [1-4:1] - 'project'> | local : submitted -- '/home/makrai/tool/python/venv/lib/python3.4/site-packages/bob/bio/base/script/verify.py' -d '/home/makrai/repo/hunspeech/emLid/babel.py' -p 'energy-2gauss' -e 'mfcc-60' -a 'gmm' -vvs '/mnt/store/makrai/work/emLid/spear_babel/' --nice '10' --parallel '4' --sub-task 'project' ' to the database
bob.bio.base@2016-08-26 12:32:04,402 -- INFO: submitted: job 'project' with id '18' and dependencies '[15, 16, 17]'
gridtk@2016-08-26 12:32:04,637 -- INFO: Added job '<Job: 19 (19) [1-4:1] - 'enr-N-dev'> | local : submitted -- '/home/makrai/tool/python/venv/lib/python3.4/site-packages/bob/bio/base/script/verify.py' -d '/home/makrai/repo/hunspeech/emLid/babel.py' -p 'energy-2gauss' -e 'mfcc-60' -a 'gmm' -vvs '/mnt/store/makrai/work/emLid/spear_babel/' --nice '10' --parallel '4' --sub-task 'enroll' --group 'dev' --model-type 'N' ' to the database
bob.bio.base@2016-08-26 12:32:04,668 -- INFO: submitted: job 'enr-N-dev' with id '19' and dependencies '[15, 16, 17, 18]'
gridtk@2016-08-26 12:32:04,707 -- INFO: Added job '<Job: 20 (20) [1-4:1] - 'score-A-dev'> | local : submitted -- '/home/makrai/tool/python/venv/lib/python3.4/site-packages/bob/bio/base/script/verify.py' -d '/home/makrai/repo/hunspeech/emLid/babel.py' -p 'energy-2gauss' -e 'mfcc-60' -a 'gmm' -vvs '/mnt/store/makrai/work/emLid/spear_babel/' --nice '10' --parallel '4' --sub-task 'compute-scores' --group 'dev' --score-type 'A' ' to the database
bob.bio.base@2016-08-26 12:32:04,726 -- INFO: submitted: job 'score-A-dev' with id '20' and dependencies '[15, 16, 17, 18, 19]'
gridtk@2016-08-26 12:32:04,953 -- INFO: Added job '<Job: 21 (21)  - 'concat-dev'> | local : submitted -- '/home/makrai/tool/python/venv/lib/python3.4/site-packages/bob/bio/base/script/verify.py' -d '/home/makrai/repo/hunspeech/emLid/babel.py' -p 'energy-2gauss' -e 'mfcc-60' -a 'gmm' -vvs '/mnt/store/makrai/work/emLid/spear_babel/' --nice '10' --parallel '4' --sub-task 'concatenate' --group 'dev' ' to the database
bob.bio.base@2016-08-26 12:32:04,971 -- INFO: submitted: job 'concat-dev' with id '21' and dependencies '[20]'
bob.bio.base@2016-08-26 12:32:04,974 -- INFO: Starting jman deamon to run the jobs on the local machine.
gridtk@2016-08-26 12:32:05,021 -- INFO: Starting execution of Job 'preprocess' (15 (1/4))
gridtk@2016-08-26 12:32:05,239 -- INFO: Starting execution of Job 'preprocess' (15 (2/4))
gridtk@2016-08-26 12:32:05,249 -- INFO: Starting execution of Job 'preprocess' (15 (3/4))
gridtk@2016-08-26 12:32:05,258 -- INFO: Starting execution of Job 'preprocess' (15 (4/4))
gridtk@2016-08-26 12:32:06,295 -- INFO: Job 'preprocess' (15 (4)) finished execution with result 'failure (69)'
gridtk@2016-08-26 12:32:06,312 -- INFO: Job 'preprocess' (15 (3)) finished execution with result 'failure (69)'
gridtk@2016-08-26 12:32:06,532 -- INFO: Job 'preprocess' (15 (2)) finished execution with result 'failure (69)'
gridtk@2016-08-26 12:32:06,549 -- INFO: Job 'preprocess' (15 (1)) finished execution with result 'failure (69)'
gridtk@2016-08-26 12:32:06,587 -- INFO: Stopping task scheduler since there are no more jobs running.
bob.bio.base@2016-08-26 12:32:06,601 -- ERROR: The jobs with the following IDS did not finish successfully: '15'.
<Job: 15 (15) [1-4:1] - 'preprocess'> | local : failure (69) -- '/home/makrai/tool/python/venv/lib/python3.4/site-packages/bob/bio/base/script/verify.py' -d '/home/makrai/repo/hunspeech/emLid/babel.py' -p 'energy-2gauss' -e 'mfcc-60' -a 'gmm' -vvs '/mnt/store/makrai/work/emLid/spear_babel/' --nice '10' --parallel '4' --sub-task 'preprocess'
Array Job 1 (ron) :
gridtk@2016-08-26 12:32:06,618 -- INFO: Contents of output file: '/mnt/store/makrai/work/emLid/spear_babel/gridtk_logs/preprocess/preprocess.o15.1'
gridtk@2016-08-26 12:32:06,618 -- INFO: Contents of error file: '/mnt/store/makrai/work/emLid/spear_babel/gridtk_logs/preprocess/preprocess.e15.1'
2016-08-26 12:32:05,503 ERROR gridtk: The job with id '15' could not be executed: [Errno 13] Permission denied
----------------------------------------
Array Job 2 (ron) :
gridtk@2016-08-26 12:32:06,619 -- INFO: Contents of output file: '/mnt/store/makrai/work/emLid/spear_babel/gridtk_logs/preprocess/preprocess.o15.2'
gridtk@2016-08-26 12:32:06,619 -- INFO: Contents of error file: '/mnt/store/makrai/work/emLid/spear_babel/gridtk_logs/preprocess/preprocess.e15.2'
2016-08-26 12:32:05,691 ERROR gridtk: The job with id '15' could not be executed: [Errno 13] Permission denied
----------------------------------------
Array Job 3 (ron) :
gridtk@2016-08-26 12:32:06,620 -- INFO: Contents of output file: '/mnt/store/makrai/work/emLid/spear_babel/gridtk_logs/preprocess/preprocess.o15.3'
gridtk@2016-08-26 12:32:06,620 -- INFO: Contents of error file: '/mnt/store/makrai/work/emLid/spear_babel/gridtk_logs/preprocess/preprocess.e15.3'
2016-08-26 12:32:05,538 ERROR gridtk: The job with id '15' could not be executed: [Errno 13] Permission denied
----------------------------------------
Array Job 4 (ron) :
gridtk@2016-08-26 12:32:06,621 -- INFO: Contents of output file: '/mnt/store/makrai/work/emLid/spear_babel/gridtk_logs/preprocess/preprocess.o15.4'
gridtk@2016-08-26 12:32:06,621 -- INFO: Contents of error file: '/mnt/store/makrai/work/emLid/spear_babel/gridtk_logs/preprocess/preprocess.e15.4'
2016-08-26 12:32:05,717 ERROR gridtk: The job with id '15' could not be executed: [Errno 13] Permission denied
----------------------------------------
------------------------------------------------------------
```
Could you please help me, what may cause this error?

Thanks
Márton

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[Márton Makrai]

sorry, I repeat the error formatted

On Friday, August 26, 2016 at 12:34:22 PM UTC+2, Márton Makrai wrote:

Thank you very much, in the help I learned that the default for the gridtk-database-file is in the working directory (where the python command is run), so this is solved.
Unfortunately now I get an other error.
I tried
`python -m bob.bio.base.script.verify -d ~/repo/hunspeech/emLid/babel.py -p energy-2gauss -e mfcc-60 -a gmm -vvs /mnt/store/makrai/work/emLid/spear_babel/ --nice 10 --parallel 4`
and 
`python -m bob.bio.base.script.verify -d ~/repo/hunspeech/emLid/babel.py -p energy-2gauss -e mfcc-60 -a gmm -vvs /mnt/store/makrai/work/emLid/spear_babel/ --grid local-p4 --run-local-scheduler --nice 10 --parallel 4`

and I got similar error.

​

[Manuel Günther]

Dear Marton,

sorry for the late reply.

I think your problem has a simple solution. You are calling the script in the wrong way. With ``buildout``, we create a script file inside the **bin** directory. So, your command line should be:

./bin/verify.py -d ~/repo/hunspeech/emLid/babel.py -p energy-2gauss -e mfcc-60 -a gmm -vvs /mnt/store/makrai/work/emLid/spear_babel/ --nice 10 --parallel 4

I thought that this was clearly documented here: http://pythonhosted.org/bob.bio.base/experiments.html#running-experiments-part-i

but apparently we need to be even more precise than that.

[Márton Makrai]

Thank you very much, now it works (with the verify.py in my virtual environment).
Márton