When I send something to a frog server (frog -S ), I get back results. But when the connection is broken it ends up in an endless loop. See the attached screenshot. I'm using the latest LaMachine distribution, but I've had this issue forever and therefore never used the server parameter.

User @stergiosmorakis ran a script processing tweets (via python-frog) that ran for a while and produced a lot of /tmp/frog* files with short input sequences. A million files were accumulated at a certain point. I should investigate when these are created (initial investigation seemed as if it was only used in server mode, which is not the case here, but I probably missed something). Then they should be cleared up in an earlier stage.

Frog is used to analyze 64 different txt files on 64 cores. It is initiated in LaMachine with frog.nf --inputdir chunks --outputdir chunks --inputformat text --sentenceperline --workers 64. However, I started the process several times, it once ran for a whole day but another time broke after only a few hours. The absolute runtime on the data should comprise around 20 days according to my calculations. Here is an excerpt of the error message.

executor >  local (64)
[7f/9f749c] process > frog_text2folia (48) [ 97%] 62 of 64, failed: 62
WARN: Killing pending tasks (63)
Error executing process > 'frog_text2folia (37)'

Caused by:
  Process `frog_text2folia (37)` terminated with an error exit status (1)

Command executed:

  set +u
        if [ ! -z "/vol/customopt/lamachine.stable" ]; then
            source /vol/customopt/lamachine.stable/bin/activate
        fi
        set -u
  
        opts=""
        if [[ "true" == "true" ]]; then
            opts="$opts -n"
        fi
        if [ ! -z "" ]; then
  frog-mopts="$opts --skip="
  fi
  
        #move input files to separate staging directory
        mkdir input
        mv *.txt input/
  
        #output will be in cwd
        mkdir output
        frog $opts --outputclass "current" --xmldir "output" --nostdout --testdir input/
        cd output
        for f in *.xml; do
            if [[ ${f%.folia.xml} == $f ]]; then
                newf="${f%.xml}.frogged.folia.xml"
            else
                newf="${f%.folia.xml}.frogged.folia.xml"
            fi
            mv $f ../$newf
        done
        cd ..

Command exit status:
  1

Command output:
  Now using node v13.3.0 (npm v6.13.4)

Command error:
  frog-mbma-:	o - 0 
  frog-mbma-:	r - 0 
  frog-mbma-:	t - 0 
  frog-mbma-:	m - N  morpheme ='ma'
  frog-mbma-:	a - 0 
  frog-mbma-:	 - /  INFLECTION: de delete='a' morpheme ='t'
  frog-mbma-:	t - 0 
  frog-mbma-:	 - V  delete='jege'
  frog-mbma-:	 - 0 
  frog-mbma-:	 - /  INFLECTION: pv delete='ge'
  frog-mbma-:	 - 0 
  frog-mbma-:	z - 0 
  frog-mbma-:	o - 0 
  frog-mbma-:	c - 0  insert='ek' delete='ch'
  frog-mbma-:	h - 0 
  frog-mbma-:	t - /  INFLECTION: pv
  frog-mbma-:tag: / infl: morhemes: [sport,ma,t] description:  confidence: 0
  frog-mbma-:
  frog-mbma-:Hmm: deleting ' is impossible. (a != ').
  frog-mbma-:Reject rule: MBMA rule (qatar):
  frog-mbma-:	q - N  morpheme ='q'
  frog-mbma-:	a - /  INFLECTION: de delete='''
executor >  local (64)
[98/46c588] process > frog_text2folia (31) [100%] 64 of 64, failed: 64
WARN: Killing pending tasks (63)
Error executing process > 'frog_text2folia (37)'

Caused by:
  Process `frog_text2folia (37)` terminated with an error exit status (1)

Command executed:

  set +u
        if [ ! -z "/vol/customopt/lamachine.stable" ]; then
            source /vol/customopt/lamachine.stable/bin/activate
        fi
        set -u
  
        opts=""
        if [[ "true" == "true" ]]; then
            opts="$opts -n"
        fi
        if [ ! -z "" ]; then
  frog-mopts="$opts --skip="
  fi
  
        #move input files to separate staging directory
        mkdir input
        mv *.txt input/
  
        #output will be in cwd
        mkdir output
        frog $opts --outputclass "current" --xmldir "output" --nostdout --testdir input/
        cd output
        for f in *.xml; do
            if [[ ${f%.folia.xml} == $f ]]; then
                newf="${f%.xml}.frogged.folia.xml"
            else
                newf="${f%.folia.xml}.frogged.folia.xml"
            fi
            mv $f ../$newf
        done
        cd ..

Command exit status:
  1
  frog-mbma-:	o - 0 
  frog-mbma-:	r - 0 
  frog-mbma-:	t - 0 
  frog-mbma-:	m - N  morpheme ='ma'
  frog-mbma-:	a - 0 
  frog-mbma-:	 - /  INFLECTION: de delete='a' morpheme ='t'
  frog-mbma-:	t - 0 
  frog-mbma-:	 - V  delete='jege'
  frog-mbma-:	 - 0 
  frog-mbma-:	 - /  INFLECTION: pv delete='ge'
  frog-mbma-:	 - 0 
  frog-mbma-:	z - 0 
  frog-mbma-:	o - 0 
  frog-mbma-:	c - 0  insert='ek' delete='ch'
  frog-mbma-:	h - 0 
  frog-mbma-:	t - /  INFLECTION: pv
  frog-mbma-:tag: / infl: morhemes: [sport,ma,t] description:  confidence: 0
  frog-mbma-:
  frog-mbma-:Hmm: deleting ' is impossible. (a != ').
  frog-mbma-:Reject rule: MBMA rule (qatar):
  frog-mbma-:	q - N  morpheme ='q'
  frog-mbma-:	a - /  INFLECTION: de delete='''
  frog-mbma-:	t - 0 
  frog-mbma-:	a - 0 
  frog-mbma-:	r - 0  INFLECTION: e
  frog-mbma-:tag: / infl: morhemes: [q] description:  confidence: 0
  frog-mbma-:
  frog-mbma-:Hmm: deleting 's is impossible. (t != ').
  frog-mbma-:Reject rule: MBMA rule (ruytse):
  frog-mbma-:	r - N  morpheme ='ruy'
  frog-mbma-:	u - 0 
  frog-mbma-:	y - 0 
  frog-mbma-:	t - /  INFLECTION: m delete=''s'
  frog-mbma-:	s - 0 
  frog-mbma-:	e - /  INFLECTION: E/P
  frog-mbma-:tag: / infl: morhemes: [ruy] description:  confidence: 0
  frog-mbma-:
  frog-mbma-:Hmm: deleting 's is impossible. (t != ').
  frog-mbma-:Reject rule: MBMA rule (duyts):
  frog-mbma-:	d - N  morpheme ='d'
  frog-mbma-:	u - N  morpheme ='uy'
  frog-mbma-:	y - 0 
  frog-mbma-:	t - /  INFLECTION: m delete=''s'
  frog-mbma-:	s - 0  INFLECTION: e
  frog-mbma-:tag: / infl: morhemes: [d,uy] description:  confidence: 0
  frog-mbma-:
  frog-:problem frogging: nlcow14ax_all_clean_martijn_36.txt
  frog-:std::bad_alloc
  frog-:Wed Jan 15 17:16:55 2020 Frog finished
  mv: cannot stat '*.xml': No such file or directory

Work dir:
  /vol/tensusers2/hmueller/LAMACHINE/wd3/work/85/5e0fda647124c40fd8fd4d2846df61

Tip: you can replicate the issue by changing to the process work dir and entering the command `bash .command.run`

When running frog for a long time, performance decreases significantly.

For instance, I'm processing a 2.8GB file. These are some pv outputs at several moments:

frog: 15.8MiB  0:05:10 [39.2KiB/s] [>                                 ]  0% ETA  4:20:44:08
frog:  545MiB  3:29:02 [62.2KiB/s] [>                                 ]  2% ETA  5:13:26:11     
frog:  858MiB  5:23:19 [30.6KiB/s] [=>                                ]  4% ETA  5:09:10:47
frog: 3.05GiB 73:28:54 [    0 B/s] [====>                             ] 14% ETA 17:22:57:01

At first, the expected time is 4 days and 20 hours. After having run for 3 days, the expected time has gone up to almost 18 days.

This is the script used:

#!/usr/bin/env bash
FILE=$1
FILE_SIZE=`wc -c < "$FILE" | cut -f1`
let "EXPECTED_FROG_SIZE = 8 * FILE_SIZE"
BODY="${FILE%.*}"

echo "Processing: $FILE"
echo "Size: $FILE_SIZE"
echo "Writing output to: ${BODY}_frog.txt"

pv -s ${FILE_SIZE} -cN in ${FILE} | frog --skip=acmnp 2> ${BODY}_frog.log | pv -s ${EXPECTED_FROG_SIZE} -cN frog > ${BODY}_frog.txt

In historical dutch, certain words may be written apart although they can be considered one token: "vol daen" (voldaan) and represented as a single <w> in FoLiA. Would the various Frog modules (mblem, mbpos etc) be able to deal with spaces in tokens?

I'm running into an error when processing pre-tokenised FoLiA:

mlp09$ frog --language=nld --skip=tmcpa /scratch/proycon/HuygensING-brieven-correspondenten-1900-1-1_02ba32f1-34da-4c4b-b839-936e03ae1642.folia.xml -X

Word(class='NUMBER',generate_id='HuygensING-brieven-correspondenten-1900-1-1_02ba32f1-34da-4c4b-b839-936e03ae1642.text.1.body.1.p.6.s.1',set='passthru') creation failed: Set 'passthru' is used but has no declaration for token-annotation

It seems the error occurs on a paragraph which contains text but no sentences/words (so it is untokenised unlike the others), when removing this paragraph, everything does process fine. It might be indicative of a more structural problem though, as the problem also occurs when I do not skip the tokeniser.

Hello, this is not an issue, just a question. Basically on accuracy of the different NLP tasks. I'm interested in comparing different types of NLP annotators and their accuracy. How well does frog do regarding accuracy on tokenisation, parts of speech tagging, lemmatisation, morphological feature annotation, dependency parsing? Are there numbers available which are comparable to the CONLL17 shared task (for example by training the frog on Dutch data from universal dependencies and next outputting the results (for example by using the evaluation script used by the CONLL17 shared task available at https://github.com/ufal/conll2017/blob/master/evaluation_script/conll17_ud_eval.py) Are such numbers available?

@Irishx suggested:

The default setting of Frog is to place mwu on 1 line as 1 token while this is actually only needed for the parser, even if you use the skip option to exclude parsing. Perhaps we should change this default setting?

@Irishx do you intend to disable MWU detection too, when the Parser is skipped?

This is easy to implement, but might change outcomes of older scripts. I am not sure if that would be a problem.

There's something wrong with the installation of the historical models still. Frog can't seem to find the tokeniser settings:

$ frog --language dum    
frog 0.19 (c) CLTS, ILK 1998 - 2019
CLST  - Centre for Language and Speech Technology,Radboud University
ILK   - Induction of Linguistic Knowledge Research Group,Tilburg University
based on [ucto 0.19, libfolia 2.4, timbl 6.4.14, ticcutils 0.23, mbt 3.5]
removing old debug files using: 'find frog.*.debug -mtime +1 -exec rm {} \;'
frog-:config read from: /data2/dev/share/frog/dum/frog.cfg
frog-:Missing [[mbma]] section in config file.
frog-:Disabled the Morhological analyzer.
frog-:Missing [[IOB]] section in config file.
frog-:Disabled the IOB Chunker.
frog-:Missing [[NER]] section in config file.
frog-:Disabled the NER.
frog-:Missing [[mwu]] section in config file.
frog-:Disabled the Multi Word Unit.
frog-:Also disabled the parser.
frog-mblem-frog-mblem-:Initiating lemmatizer...
ucto: textcat configured from: /data2/dev/share/ucto/textcat.cfg
frog-tok-:Language List =[dum]
ucto: No useful settingsfile(s) could be found.
frog-tagger-tagger-:reading subsets from /data2/dev/share/frog/dum//crmsub.cgn
frog-tagger-tagger-:reading constraints from /data2/dev/share/frog/dum//crmconstraints.cgn
frog-:Initialization failed for: [tokenizer] 
frog-:fatal error: Frog init failed

$ cat /data2/dev/share/frog/dum/frog.cfg | grep tok
[[tokenizer]]
rulesFile=tokconfig-nld-historical

$ ls /data2/dev/share/ucto/*hist*
/data2/dev/share/ucto/tokconfig-nld-historical

@antalvdb and @proycon

I think it is time for a great overhaul of Frog, to

• reduce complexity
• increase maintainability
• be more flexible
• speed things up

The main aspect to consider: At the moment Frog uses FoLiA as it's internal data-structure. That seemed a good plan once, but with growing data-sets this now became a memory hog. Also it has some nasty MultiThreading issues. (like different FoLiA files after every run, all valid) It also makes processing line-by-line almost impossible, as the whole input file is stuffed into one FoLiA document. I think that processing smaller chunks would speed up the process, and will deliver output at a more constant pace. (not just one burst of FoLiA at the end) This would mean that we cannot directly use the Ucto 'tokenize-to-FoLiA` facility anymore. But that is a small burden, IMHO. Also there remains the problem of FoLiA output at the end of Frog. That would still mean a very large file, on large input. But it IS possible to create a 'main' file with a bunch of sub-files, using the FoLiA 'external' mechanism. In the current situation this is almost impossible.

Also I am working on a FoLiA Builder class, which creates a FoLiA file on disk incrementally, without first creating it completely in memory. This reduces the footprint of Frog but still may produce insane large files (>10Gb or so)

caveat: This solution does not work for FoLiA input into Frog. If you read a very large file,it stays large :) What MIGHT be possible is to do is to make a FoLiA Reader class, which reads chunks form a FoLiA file, have them processed by Frog and assemble the results back into another FoLiA file. (using the Builder for instance)

I think other improvements might also be welcome, but this is the most intrusive one, I guess. At the and, the Frog results will not be changed, just produced faster.

I think I would need a few months to accomplish this. It would be a nice task. But a bit to large to do 'on the side' maybe a CLARIAH+ or a CLARIN-NL project?

Comments and additions welcome!

Forwarding bug report mailed by Alex Bransen:

ik krijg frog maar niet aan de praat met folia als input, maar wil even
checken of dat door mijn installatie komt, of dat jij het ook hebt. Zou je
als je even tijd hebt het bijgevoegde folia bestand door frog willen
gooien, om te kijken of jij ook een error krijgt? Ik krijg:

"terminate called without an active exception" (lekker nuttige error ook)

cmd is: frog -x BAAC_A-11-0119.xml -X frogged-BAAC.xml

gek genoeg als ik de -x flag naar -t verander (en hij dus het xml als plain
text gaat behandelen) doet hij het wel..

Volgens foliavalidator is het wel valid XML trouwens.

Input file is https://download.anaproy.nl/BAAC_A-11-0119.xml , I can reproduce the bug locally on the latest development version.

Frog (libfolia) segfaults on the attached FoLiA input upon FoLiA serialisation.

<?xml version="1.0" encoding="utf-8"?>
<FoLiA xmlns="http://ilk.uvt.nl/folia" version="2.5" xml:id="example">
  <metadata>
      <annotations>
          <text-annotation>
                         <annotator processor="p1" />
          </text-annotation>
          <utterance-annotation>
                         <annotator processor="p1" />
          </utterance-annotation>
          <event-annotation set="speech">
                         <annotator processor="p1" />
          </event-annotation>
      </annotations>
      <provenance>
         <processor xml:id="p1" name="proycon" type="manual" />
      </provenance>
  </metadata>
  <text xml:id="example.speech">
      <event xml:id="turn.1" class="turn" src="piet.wav" begintime="00:00:00.720" endtime="00:00:53.230">
        <utt xml:id="example.utt.1" speaker="Piet">
            <t>Het is vandaag 1 januari 2019. Mijn naam is Piet voor het project Diplomatieke Getuigenissen heb ik vandaag een gesprek met Piet. Ook met ons in de kamer is Piet die voor ons het geluid en de video verzorgt. Meneer Piet misschien dat we gewoon kunnen beginnen met dat u iets over uw opleiding vertelt en hoe u bij Buitenlandse Zaken bent komen te werken?</t>
        </utt>
        <utt xml:id="example.utt.2" speaker="Piet">
            <t>Ja ik ben geboren in 1936. Volgens de boeken het heilige jaar voor de Chinezen. 1936. In 2036 is er weer zo'n heilig jaar. Ik ben ... </t>
        </utt>
      </event>
  </text>
</FoLiA>

Call: frog --skip=pac -x anon_1.folia.xml -X anon_1.out.folia.xml

All actual processing goes fine, it is the FoLiA serialisation in the end that fails.

gdb backtrace:

Thread 1 "frog" received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
(gdb) bt
#0  0x0000000000000000 in ?? ()
#1  0x00007fa4eae08999 in folia::AbstractElement::append (this=<optimized out>, [email protected]=0x7fa4e700a580, child=<optimized out>, [email protected]=0x7fa4e659a7f0) at folia_impl.cxx:3129
#2  0x00007fa4eae98ee2 in folia::AbstractStructureElement::append (this=0x7fa4e700a580, child=0x7fa4e659a7f0) at folia_subclasses.cxx:784
#3  0x00007fa4eae306fc in folia::AbstractElement::AbstractElement ([email protected]=0x7fa4e659a7f0, [email protected]=0x7fa4eb5abfc0 <VTT for folia::Paragraph+16>, p=..., [email protected]=0x7fa4e700a580, __in_chrg=<optimized out>) at folia_impl.cxx:293
#4  0x00007fa4eb4cd949 in folia::AbstractStructureElement::AbstractStructureElement (p=0x7fa4e700a580, props=..., __vtt_parm=0x7fa4eb5abfb8 <VTT for folia::Paragraph+8>, this=0x7fa4e659a7f0, __in_chrg=<optimized out>)
    at /usr/local/include/libfolia/folia_subclasses.h:59
#5  folia::Paragraph::Paragraph (p=0x7fa4e700a580, a=..., this=0x7fa4e659a7f0, __in_chrg=<optimized out>, __vtt_parm=<optimized out>) at /usr/local/include/libfolia/folia_subclasses.h:626
#6  folia::FoliaElement::add_child<folia::Paragraph> (args=..., this=0x7fa4e700a580) at /usr/local/include/libfolia/folia_impl.h:125
#7  FrogAPI::handle_one_text_parent (this=0x7ffc1bc9e600, os=..., e=0x7fa4e700a580, sentence_done=<optimized out>) at FrogAPI.cxx:2567
#8  0x00007fa4eb4ce462 in FrogAPI::run_folia_engine (this=0x7ffc1bc9e600, infilename=..., output_stream=...) at FrogAPI.cxx:2661
#9  0x00007fa4eb4d0bf1 in FrogAPI::FrogFile (this=0x7ffc1bc9e600, infilename=...) at FrogAPI.cxx:2743
#10 0x00007fa4eb4d3cbd in FrogAPI::run_on_files (this=0x7ffc1bc9e600) at FrogAPI.cxx:1175
#11 0x000055c8b0feafd2 in main (argc=<optimized out>, argv=<optimized out>) at Frog.cxx:229
frog_segfault (END)

Ik heb een corpus met 25 miljard woorden die ik wil 'froggen', daarvoor heb ik een 32 core/128GB RAM computer. M'n plan is om 16 losse instanties van frog te draaien, max. 500 woorden per zin. En het lijkt dat ik dan 10k woorden per seconde kan 'froggen'.

Maar dat roept natuurlijk wat vragen op.

1: Hoe waarschijnlijk is het dat 128GB ergens halverwege het proces te weinig blijkt? Is het geheugenverbruik redelijk constant? Is het verstandig om m'n data op te delen in kleine 'chunks'? 2: Met 10kw/s zou m'n hele corpus ongeveer een maand aan computatie vereisen, wat ok is, maar ook voldoende lang dat ik wel wat tijd wil investering om de performance beter te krijgen (met het idee dat dat ook zinnig is voor anderen). Is er nog 'laag hangend fruit' wat betreft de performance? Mijn eerste instinct is dat er veel 'communicatie' is en dat de interne representatie van tokens en hun metadata te complex is. Maar dat is niet makkelijk om om te bouwen. 3: FoLiA is heel flexibel maar simpelweg te veel data, zelfs compressed zou het corpus dan vele terabytes zijn, gewoon niet zo handig als het niet op een normale SSD past. Ik heb even een opzetje gemaakt voor een bestandsformaat wat een vaste 8 bytes per token gebruikt. Daar moet natuurlijk wat voor inleveren (maar 2⁸ PoS tags, theoretisch kun je er ~320 maken volgens mij en maar 2²⁵ soorten tokens (ex. MWU)) , maar dan kun je wel complexe zoekopdrachten best snel doen (ik mik op bijv. 100 miljoen tokens/s). En met basic compressie van de meeste frequente woorden kan ik dan m'n hele corpus in geheugen houden. Is hier misschien al is eerder over nagedacht? Ik zou niet halfslachtig iets opnieuw willen implementeren. 4: Waar zou ik kunnen lezen over hoe frog is getraind en op welke data? Ik zou graag een inschatting maken van wat voor nauwkeurigheid ik kan verwachten op m'n dataset. En waar mogelijk iets hertrainen om beter aan daar beter op aan te sluiten.

In frog there is quite a messy way of handling options and configuration details. We have FrogOptions and a TiCC::Configuration part to store information.

This could be simplified a lot by making the Configuration internal to the configuration file parsing and storing all necessary information in the Options.

When resolving MWU's (in frog_data::resolve_mwus() ) the deep_morphs structure is lost; only the deep_morph_string member is resolved. This is disadvantageous, as it is impossible to retrieve the separate deep_morphs and inflections from MWU's (without stupid split() actions). This especially a problem while creating JSON output. TODO: rework MWU resolving keeping the parts available.

The 'tabbed' format is quite rigid, and sometimes difficult to read. (especially when some modules are skipped). It might be handy to create JSON output as an alternative. This might really be useful for the SERVER mode.

NOTE: consider JSON input for the server too then,

in --deep_morph mode, MBMA can detect al kinds of compounds, and even outputs them. it would be very useful if we could add some code to give the logical splitting of the detected compounds.

e.g. Frog now gives for 'appeltaart' [[appel]noun[taart]noun]noun/singular NN-compound it seems doable to also give 'appel-taart'

In practice this can become very complicated: 'appelgebak' gives: [[appel]noun[[ge][bak]noun]noun/singular]noun NN-compound

You would like te get appel-gebak' NOTappel-ge-bakorappelge-bak` For longer compounds it gets even more difficult.

verkeersagent [[verkeer]noun[s][[ageer]verb[ent]]noun]noun/singular NN-compound

But still it seems worth investigating.