AutoPhrase: Automated Phrase Mining from Massive Text Corpora
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README.md

AutoPhrase: Automated Phrase Mining from Massive Text Corpora

Publications

Please cite the following two papers if you are using our tools. Thanks!

Recent Changes

2018.03.04

  • Fix a few bugs during the pre-processing and post-processing, i.e., Tokeninzer.java. Previously, when the corpus contains characters like /, the results could be wrong or errors may occur.
  • When the phrasal segmentation is serving new text, for the phrases (every token is seen in the traning corpus) provided in the knowledge base (wiki_quality.txt), the score is set as 1.0. Previously, it was kind of infinite.

2017.10.23

  • Support extremely large corpus (e.g., 100GB or more). Please comment out the // define LARGE in the beginning of src/utils/parameters.h before you run AutoPhrase on such a large corpus.
  • Quality phrases (every token is seen in the raw corpus) provided in the knowledge base will be incorporated during the phrasal segmentation, even their frequencies are smaller than MIN_SUP.
  • Stopwords will be treated as low quality single-word phrases.
  • Model files are saved separately. Please check the variable MODEL in both auto_phrase.sh and phrasal_segmentation.sh.
  • The end of line is also a separator for sentence splitting.

New Features

(compared to SegPhrase)

  • Minimized Human Effort. We develop a robust positive-only distant training method to estimate the phrase quality by leveraging exsiting general knowledge bases.
  • Support Multiple Languages: English, Spanish, and Chinese. The language in the input will be automatically detected.
  • High Accuracy. We propose a POS-guided phrasal segmentation model incorporating POS tags when POS tagger is available. Meanwhile, the new framework is able to extract single-word quality phrases.
  • High Efficiency. A better indexing and an almost lock-free parallelization are implemented, which lead to both running time speedup and memory saving.

Related GitHub Repositories

Requirements

Linux or MacOS with g++ and Java installed.

Ubuntu:

  • g++ 4.8 $ sudo apt-get install g++-4.8
  • Java 8 $ sudo apt-get install openjdk-8-jdk
  • curl $ sudo apt-get install curl

MacOS:

  • g++ 6 $ brew install gcc6
  • Java 8 $ brew update; brew tap caskroom/cask; brew install Caskroom/cask/java

Default Run

Phrase Mining Step

$ ./auto_phrase.sh

The default run will download an English corpus from the server of our data mining group and run AutoPhrase to get 3 ranked lists of phrases as well as 2 segmentation model files under the MODEL (i.e., models/DBLP) directory.

  • AutoPhrase.txt: the unified ranked list for both single-word phrases and multi-word phrases.
  • AutoPhrase_multi-words.txt: the sub-ranked list for multi-word phrases only.
  • AutoPhrase_single-word.txt: the sub-ranked list for single-word phrases only.
  • segmentation.model: AutoPhrase's segmentation model (saved for later use).
  • token_mapping.txt: the token mapping file for the tokenizer (saved for later use).

You can change RAW_TRAIN to your own corpus and you may also want change MODEL to a different name.

Phrasal Segmentation

We also provide an auxiliary function to highlight the phrases in context based on our phrasal segmentation model. There are two thresholds you can tune in the top of the script. The model can also handle unknown tokens (i.e., tokens which are not occurred in the phrase mining step's corpus).

In the beginning, you need to specify AutoPhrase's segmentation model, i.e., MODEL. The default value is set to be consistent with auto_phrase.sh.

$ ./phrasal_segmentation.sh

The segmentation results will be put under the MODEL directory as well (i.e., model/DBLP/segmentation.txt). The highlighted phrases will be enclosed by the phrase tags (e.g., <phrase>data mining</phrase>).

Incorporate Domain-Specific Knowledge Bases

If domain-specific knowledge bases are available, such as MeSH terms, there are two ways to incorporate them.

  • (recommended) Append your known quality phrases to the file data/EN/wiki_quality.txt.
  • Replace the file data/EN/wiki_quality.txt by your known quality phrases.

Handle Other Languages

Tokenizer and POS tagger

In fact, our tokenizer supports many different languages, including Arabics (AR), German (DE), English (EN), Spanish (ES), French (FR), Italian (IT), Japanese (JA), Portuguese (PT), Russian (RU), and Chinese (CN). If the language detection is wrong, you can also manually specify the language by modify the TOKENIZER command in the bash script auto_phrase.sh using the two-letter code for that language. For example, the following one forces the language to be English.

TOKENIZER="-cp .:tools/tokenizer/lib/*:tools/tokenizer/resources/:tools/tokenizer/build/ Tokenizer -l EN"

We also provide a default tokenizer together with a dummy POS tagger in the tools/tokenizer. It uses the StandardTokenizer in Lucene, and always assign a tag UNKNOWN to each token. To enable this feature, please add the -l OTHER" to the TOKENIZER command in the bash script auto_phrase.sh.

TOKENIZER="-cp .:tools/tokenizer/lib/*:tools/tokenizer/resources/:tools/tokenizer/build/ Tokenizer -l OTHER"

If you want to incorporate your own tokenizer and/or POS tagger, please create a new class extending SpecialTagger in the tools/tokenizer. You may refer to StandardTagger as an example.

stopwords.txt

You may try to search online or create your own list.

wiki_all.txt and wiki_quality.txt

Meanwhile, you have to add two lists of quality phrases in the data/OTHER/wiki_quality.txt and data/OTHER/wiki_all.txt. The quality of phrases in wiki_quality should be very confident, while wiki_all, as its superset, could be a little noisy. For more details, please refer to the tools/wiki_enities.

Docker

###Default Run

sudo docker run -v $PWD/results:/autophrase/results -it \
    -e FIRST_RUN=1 -e ENABLE_POS_TAGGING=1 \
    -e MIN_SUP=30 -e THREAD=10 \
    remenberl/autophrase

./autophrase.sh

The results will be available in the results folder.

###User Specified Input Assuming the path to input file is ./data/input.txt.

sudo docker run -v $PWD/data:/autophrase/data -v $PWD/results:/autophrase/results -it \
    -e RAW_TRAIN=data/input.txt \
    -e FIRST_RUN=1 -e ENABLE_POS_TAGGING=1 \
    -e MIN_SUP=30 -e THREAD=10 \
    remenberl/autophrase

./autophrase.sh