NL Reference Corpus

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The NL Reference Corpus (NC) is the corpus used to prepare and to assess grammars for sentence-based [[UNLization]]. It is divided in 6 different levels according to the [[FRAU|Framework of Reference for UNL (FRAU)]]:
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The NL Reference Corpus (NC) is the corpus used to prepare and to assess grammars for sentence-based [[UNLization]]. It is divided in 6 different levels according to the [[FoR-UNL|Framework of Reference for UNL (FoR-UNL)]]:
 
*NC-A1: NL Reference Corpus A1  
 
*NC-A1: NL Reference Corpus A1  
 
*NC-A2: NL Reference Corpus A2  
 
*NC-A2: NL Reference Corpus A2  
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== Methodology ==
 
== Methodology ==
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As a natural language corpus, the NC varies for each language. It must be derived from a base corpus to be processed according to the following criteria:
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As a natural language corpus, the NC varies for each language. It is derived from a base corpus to be compiled and processed according to the following criteria:
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#The Base Corpus must have at least 5,000,000 tokens (any sequence of alphanumeric characters isolated by blank space and other word boundary markers). The Base Corpus must be as representative as possible of the standard use of the written language, and should include documents from different genres and domains.  
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#The '''Base Corpus''' must have at least 5,000,000 tokens (strings isolated by blank space and other word boundary markers). It must be representative of the contemporary standard use of the written language, and should include documents from as many different genres and domains as possible.  
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#The Base Corpus must be segmented according to the usual set of sentence boundary markers (punctuation marks and end of paragraph).
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#The Base Corpus must be '''segmented''' (in sentences).
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#The Average Sentence Length will be calculated from the number of segmented sentences according. The Average Sentence Length will be used to differentiate between the three main levels of reference (A, B and C).
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#The Segmented Corpus must be '''tokenized''' (according to the natural language dictionary exported from the UNLarium).
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#All sentences must be
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#The Tokenized Corpus must be '''annotated''' for lexical category, in order to generate the [[LSS|linear sentence structures]] (LSS).
 +
#The Annotated Corpus (C) must be subdivided into 6 different subsets, according to the number of tokens:
 +
#*A1C = length <= 15th percentile (very small sentences)
 +
#*A2C = 15th percentile < length <= 30th percentile (small sentences)
 +
#*B1C = 30th percentile < length <= 45th percentile (small medium-size sentences)
 +
#*B2C = 45th percentile < length <= 60th percentile (long medium-size sentences)
 +
#*C1C = 60th percentile < length <= 80th percentile (long sentences)
 +
#*C2C = length > 80th percentile (very long sentences)
 +
#Each subcorpus is used to compile a part of the NC corpus: the training corpora (A) and the testing corpora (B).
 +
#*The training corpora consists of 1 exemplar of the 1,000 most frequent LSS, and will be used to prepare the grammar:
 +
#**A1A = 1 sentence for each 1,000 most frequent LSS from A1_C (1,000 sentences in total)
 +
#**A2A = 1 sentence for each 1,000 most frequent LSS from A2_C (1,000 sentences in total)
 +
#**B1A = 1 sentence for each 1,000 most frequent LSS from B1_C (1,000 sentences in total)
 +
#**B2A = 1 sentence for each 1,000 most frequent LSS from B2_C (1,000 sentences in total)
 +
#**C1A = 1 sentence for each 1,000 most frequent LSS from C1_C (1,000 sentences in total)
 +
#**C2A = 1 sentence for each 1,000 most frequent LSS from C2_C (1,000 sentences in total)
 +
#*The testing corpora consists of 4 exemplars of each LSS included in the training corpora. The exemplars are randomly selected in the Annotated Corpus.
 +
#**A1B = 4 sentences for each 1,000 most frequent LSS from A1_C (4,000 sentences in total)
 +
#**A2B = 4 sentences for each 1,000 most frequent LSS from A2_C (4,000 sentences in total)
 +
#**B1B = 4 sentences for each 1,000 most frequent LSS from B1_C (4,000 sentences in total)
 +
#**B2B = 4 sentences for each 1,000 most frequent LSS from B2_C (4,000 sentences in total)
 +
#**C1B = 4 sentences for each 1,000 most frequent LSS from C1_C (4,000 sentences in total)
 +
#**C2B = 4 sentences for each 1,000 most frequent LSS from C2_C (4,000 sentences in total)
 +
#The whole NC corpus (i.e., 5 exemplars for each LSS) is used to calculate the [[F-measure]], which is the parameter for assessing the precision and the recall of the grammars.
  
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== Files ==
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of at least 5,000,000 tokens,
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{|border=1 cellpadding=5
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!rowspan=2|Language
−
 
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!colspan=6|Training Corpora (A)
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according to the following criteria:
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!colspan=6|Test Corpora (B)
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*NC-A1 must correspond to exemplars of the 500 most frequent syntactic structures among the shortest ones
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!colspan=6|Annotated Corpora (C)
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*NC-A2 must correspond to exemplars of the 1,000 most frequent syntactic structures among the shortest ones
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!colspan=6|Percentiles<br |>(number of tokens)
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*NC-B1 must correspond to exemplars of the 1,500 most frequent syntactic structures among those below the average length
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!colspan=6|Sentences (Total)
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*NC-B2 must correspond to exemplars of the 2,000 most frequent syntactic structures among those below the average length
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|-
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*NC-C1 must correspond to exemplars of the 2,500 most frequent syntactic structures among all
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!A1A
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*NC-C2 must correspond to exemplars of the 3,000 most frequent syntactic structures among all
+
!A2A
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In the above:
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!B1A
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:A token is (such as punctuation marks)
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!B2A
−
:The set of "shortes
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!C1A
 +
!C2A
 +
!A1B
 +
!A2B
 +
!B1B
 +
!B2B
 +
!C1B
 +
!C2B
 +
!A1C
 +
!A2C
 +
!B1C
 +
!B2C
 +
!C1C
 +
!C2C
 +
!A1
 +
!A2
 +
!B1
 +
!B2
 +
!C1
 +
!C2
 +
!A1C
 +
!A2C
 +
!B1C
 +
!B2C
 +
!C1C
 +
!C2C
 +
|-
 +
|Arabic
 +
|[http://www.unlweb.net/resources/corpus/NC/NC_ara_A1A.rar]
 +
|[http://www.unlweb.net/resources/corpus/NC/NC_ara_A2A.rar]
 +
|[http://www.unlweb.net/resources/corpus/NC/NC_ara_B1A.rar]
 +
|[http://www.unlweb.net/resources/corpus/NC/NC_ara_B2A.rar]
 +
|[http://www.unlweb.net/resources/corpus/NC/NC_ara_C1A.rar]
 +
|[http://www.unlweb.net/resources/corpus/NC/NC_ara_C2A.rar]
 +
|[http://www.unlweb.net/resources/corpus/NC/NC_ara_A1B.rar]
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|[http://www.unlweb.net/resources/corpus/NC/NC_ara_A2B.rar]
 +
|[http://www.unlweb.net/resources/corpus/NC/NC_ara_B1B.rar]
 +
|[http://www.unlweb.net/resources/corpus/NC/NC_ara_B2B.rar]
 +
|[http://www.unlweb.net/resources/corpus/NC/NC_ara_C1B.rar]
 +
|[http://www.unlweb.net/resources/corpus/NC/NC_ara_C2B.rar]
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|[http://www.unlweb.net/resources/corpus/NC/NC_ara_A1C.rar]
 +
|[http://www.unlweb.net/resources/corpus/NC/NC_ara_A2C.rar]
 +
|[http://www.unlweb.net/resources/corpus/NC/NC_ara_B1C.rar]
 +
|[http://www.unlweb.net/resources/corpus/NC/NC_ara_B2C.rar]
 +
|[http://www.unlweb.net/resources/corpus/NC/NC_ara_C1C.rar]
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|[http://www.unlweb.net/resources/corpus/NC/NC_ara_C2C.rar]
 +
|1-8
 +
|9-12
 +
|13-16
 +
|17-21
 +
|22-31
 +
|32-
 +
|118,067
 +
|155,495
 +
|153,312
 +
|149,948
 +
|170,893
 +
|163,214
 +
|}

Latest revision as of 14:44, 18 April 2014

The NL Reference Corpus (NC) is the corpus used to prepare and to assess grammars for sentence-based UNLization. It is divided in 6 different levels according to the Framework of Reference for UNL (FoR-UNL):

  • NC-A1: NL Reference Corpus A1
  • NC-A2: NL Reference Corpus A2
  • NC-B1: NL Reference Corpus B1
  • NC-B2: NL Reference Corpus B2
  • NC-C1: NL Reference Corpus C1
  • NC-C2: NL Reference Corpus C2

Methodology

As a natural language corpus, the NC varies for each language. It is derived from a base corpus to be compiled and processed according to the following criteria:

  1. The Base Corpus must have at least 5,000,000 tokens (strings isolated by blank space and other word boundary markers). It must be representative of the contemporary standard use of the written language, and should include documents from as many different genres and domains as possible.
  2. The Base Corpus must be segmented (in sentences).
  3. The Segmented Corpus must be tokenized (according to the natural language dictionary exported from the UNLarium).
  4. The Tokenized Corpus must be annotated for lexical category, in order to generate the linear sentence structures (LSS).
  5. The Annotated Corpus (C) must be subdivided into 6 different subsets, according to the number of tokens:
    • A1C = length <= 15th percentile (very small sentences)
    • A2C = 15th percentile < length <= 30th percentile (small sentences)
    • B1C = 30th percentile < length <= 45th percentile (small medium-size sentences)
    • B2C = 45th percentile < length <= 60th percentile (long medium-size sentences)
    • C1C = 60th percentile < length <= 80th percentile (long sentences)
    • C2C = length > 80th percentile (very long sentences)
  6. Each subcorpus is used to compile a part of the NC corpus: the training corpora (A) and the testing corpora (B).
    • The training corpora consists of 1 exemplar of the 1,000 most frequent LSS, and will be used to prepare the grammar:
      • A1A = 1 sentence for each 1,000 most frequent LSS from A1_C (1,000 sentences in total)
      • A2A = 1 sentence for each 1,000 most frequent LSS from A2_C (1,000 sentences in total)
      • B1A = 1 sentence for each 1,000 most frequent LSS from B1_C (1,000 sentences in total)
      • B2A = 1 sentence for each 1,000 most frequent LSS from B2_C (1,000 sentences in total)
      • C1A = 1 sentence for each 1,000 most frequent LSS from C1_C (1,000 sentences in total)
      • C2A = 1 sentence for each 1,000 most frequent LSS from C2_C (1,000 sentences in total)
    • The testing corpora consists of 4 exemplars of each LSS included in the training corpora. The exemplars are randomly selected in the Annotated Corpus.
      • A1B = 4 sentences for each 1,000 most frequent LSS from A1_C (4,000 sentences in total)
      • A2B = 4 sentences for each 1,000 most frequent LSS from A2_C (4,000 sentences in total)
      • B1B = 4 sentences for each 1,000 most frequent LSS from B1_C (4,000 sentences in total)
      • B2B = 4 sentences for each 1,000 most frequent LSS from B2_C (4,000 sentences in total)
      • C1B = 4 sentences for each 1,000 most frequent LSS from C1_C (4,000 sentences in total)
      • C2B = 4 sentences for each 1,000 most frequent LSS from C2_C (4,000 sentences in total)
  7. The whole NC corpus (i.e., 5 exemplars for each LSS) is used to calculate the F-measure, which is the parameter for assessing the precision and the recall of the grammars.

Files

Language Training Corpora (A) Test Corpora (B) Annotated Corpora (C) Percentiles
(number of tokens) 		Sentences (Total)
A1A A2A B1A B2A C1A C2A A1B A2B B1B B2B C1B C2B A1C A2C B1C B2C C1C C2C A1 A2 B1 B2 C1 C2 A1C A2C B1C B2C C1C C2C
Arabic [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] 1-8 9-12 13-16 17-21 22-31 32- 118,067 155,495 153,312 149,948 170,893 163,214
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