MAPC is a manually aligned parallel corpus of Chinese-English literary texts, consisting of chapters sampled from six Chinese novels and their English translations.

Although MAPC is initially created for evaluating the performance of automatic sentence aligners such as Hunalign, Belualign, Vecalign and Bertalign, the corpus can also be used in the study of contrastive linguistics, the difference between translated v.s. non-translated language and translation strategies, etc.

Makeup and Statistics

The novels in MAPC are selected from a range of different genres and for each novel, five chapters are sampled from the beginning, middle and end of the book. We then take one chapter from each novel and construct a development set MAPC-Dev. The remaining chapters make up MAPC-Test.

Please check Dev-metadata and Test-metadata for more information about the development and test set.

Table 1. Makeup of MAPC

Genre	Book_Title	Author	Trans_Title	Translator
Humor	黄金时代	王小波	The Golden Age	Hongling Zhang; Jason Sommer
Martial Arts	鹿鼎记	金庸	The Deer and The Cauldron	John Minford
Classic	红楼梦	曹雪芹	The Story of the Stone	David Hawkes
War	红高粱	莫言	Red Sorghum	Howard Goldblatt
Romance	长恨歌	王安忆	The Song of Everlasting Sorrow	Michael Berry; Susan Chan Egan
Sci-fi	三体	刘慈欣	The Three-Body Problem	Ken Liu

Table 2. Statistics of MAPC

Data	# Src_Sents	# Tgt_Sents	# Src_Tokens	# Tgt_Tokens
MAC-Dev	1,391	2,505	37,024	47,959
MAC-Test	4,875	6,610	91,971	121,306

Manual Alignment and Inter-Coder Agreement

The bilingual texts in MAPC are split into sentences and aligned at the sentence level using the manual alignment tool InterText.

The manual alignment was made by two annotators to ensure accuracy and reliability. The hand-checked alignments are saved in the directory intertext_01 for the first annotator and intertext_02 for the second annotator.

We use the Python script mark_disagreement.py to mark up any differences between two annotators:

python mark_disagreement.py -a1 test/intertext_01/test-anno-1.001_zh.001_en.xml -a2 test/intertext_02/test-anno-2.001_zh.001_en.xml

Figure 1. Markup of Annotator Differences

The observed differences are then resolved through discussions between the annotators. We found that many disagreements can be attributed to various translation techniques (e.g., omission, addition and sentence inversion) employed by translators to make the target texts more fluent and adequate.

All the cases of annotator differences and the corresponding resolutions have been recorded in an Excel file anno_disagreement.xlsx. The final alignments verified by both annotators are saved in the directory dev/Intertext and test/Intertext.

We use the set-based metric Jaccard Index as suggested by Artstein & Poesio (2008) to measure the Inter-Coder Agreement (ICA):

python compute_ica.py -a1 test/intertext_01 -a2 test/intertext_02

TSV Format

To facilitate follow-up search and annotation of parallel corpus, you can run the Python script intertext2tsv.py to convert Intertext XML files into TSV format:

python intertext2tsv.py -i test/intertext -o test/tsv

The bilingual corpus in TSV format will be saved in the tsv directory.

References

Artstein, R., & Poesio, M. (2008). Inter-coder agreement for computational linguistics. Computational linguistics, 34(4), 555-596.