Skip to content


Subversion checkout URL

You can clone with
Download ZIP
BLLIP reranking parser. David McClosky's branch. For main development and filing issues, please use
GAP C++ C Python Makefile Shell
Latest commit 925fef3 @dmcc python/bllipparser/ bugfix, docs, standardize prec…

get_reranker_best() used to crash with an empty n-best list.

python/tests/ test reprs, sentences_from_file,
    get_unified_model_parameters, from_unified_model_dir,
    tree functions and their loading errors, output types from various funcs,
    sort_by_parser_scores, sort_by_reranker_scores, parse_tagged with bad tags,
    get_parser_best, get_reranker_best, additional parse failures with and
    without constraints
Failed to load latest commit information.
dockerfiles dockerfiles/python/Dockerfile: PyStanfordDependencies and friends
first-stage first-stage/PARSE/SimpleAPI.C: fix typo
python python/bllipparser/ bugfix, docs, standardize prec…
sample-text sample-test/fails.sgml: Add 500 word sentence
second-stage Add German head finding rules for reranker
.gitignore Use tox for multi-version Python testing
.hgignore Use tox for multi-version Python testing
.travis.yml .travis.yml: optimize and flip clauses
CHECKLIST.txt pass --ignore flags
CONTRIBUTING.rst CONTRIBUT{ORS,ING}.rst: Initial version
CONTRIBUTORS.rst Add Python 3 support (issue #26)
LICENSE-2.0.txt Apply Apache 2.0 license. Fix issue #39
MODELS.rst python/bllipparser/ use default model directory
Makefile Makefile: add "make world" target
Makefile.gavper Makefiles: switch -O6 to -O3
Makefile.splh Makefiles: switch -O6 to -O3
NOTICE Removed evalb from the distribution.
README-python.rst Add Python 3 support (issue #26)
README.rst README.rst: Add charniak-emscripten fork Use cvlm-lbfgs in more Makefiles/scripts Use cvlm-lbfgs in more Makefiles/scripts Apply Apache 2.0 license. This script works out-of-the-box again. Add Syntactic Parse Fusion Removed evalb from the distribution. Apply Apache 2.0 license.
regression-test regression-test: Minor text updates
setup.cfg Add Python 3 support (issue #26) pass --ignore flags
tox.ini python/tests/ improve test coverage Use cvlm-lbfgs in more Makefiles/scripts


BLLIP Reranking Parser

Copyright Mark Johnson, Eugene Charniak, 24th November 2005 --- August 2006

We request acknowledgement in any publications that make use of this software and any code derived from this software. Please report the release date of the software that you are using, as this will enable others to compare their results to yours.


BLLIP Parser is a statistical natural language parser including a generative constituent parser (first-stage) and discriminative maximum entropy reranker (second-stage). The latest version can be found on GitHub. This document describes basic usage of the command line interface and describes how to build and run the reranking parser. There are now Python and Java interfaces as well. The Python interface is described in README-python.rst.

Compiling the parser

  1. (optional) For optimal speed, you may want to define $GCCFLAGS specifically for your machine. However, this step can be safely skipped as the defaults are usually fine. With csh or tcsh, try something like:

    shell> setenv GCCFLAGS "-march=pentium4 -mfpmath=sse -msse2 -mmmx"


    shell> setenv GCCFLAGS "-march=opteron -m64"
  2. Build the parser with:

    shell> make
    • Sidenote on compiling on OS X

      OS X uses the clang compiler by default which cannot currently compile the parser. Try setting this environment variable before building to change the default C++ compiler:

      shell> setenv CXX g++

      Recent versions of OS X may have additional issues. See issues 19 and 13 for more information.

Obtaining parser models

The GitHub repository includes parsing and reranker models, though these are mostly around for historical purposes. See this page on BLLIP Parser models for information about obtaining newer and more accurate parsing models.

Running the parser

After it has been built, the parser can be run with:

shell> <sourcefile.txt>

For example:

shell> sample-text/sample-data.txt

The input text must be pre-sentence segmented with each sentence in an <s> tag:

<s> Sentence 1 </s>
<s> Sentence 2 </s>

Note that there needs to be a space before and after the sentence.

The parser distribution currently includes a basic Penn Treebank Wall Street Journal parsing models which will use by default. The Python interface to the parser includes a mechanism for listing and downloading additional parsing models (some of which are more accurate, depending on what you're parsing).

The script demonstrates how to run syntactic parse fusion. Fusion can also be run via the Python bindings.

The script takes a list of treebank files as arguments and extracts the terminal strings from them, runs the two-stage parser on those terminal strings and then evaluates the parsing accuracy with Sparseval. For example, if the Penn Treebank 3 is installed at /usr/local/data/Penn3/, the following code evaluates the two-stage parser on section 24:

shell> /usr/local/data/Penn3/parsed/mrg/wsj/24/wsj*.mrg

The Makefile will attempt to automatically download and build Sparseval for you if you run make sparseval.

For more information on Sparseval see this paper:

    title={SParseval: Evaluation metrics for parsing speech},
    author={Roark, Brian and Harper, Mary and Charniak, Eugene and
            Dorr, Bonnie and Johnson, Mark and Kahn, Jeremy G and
            Liu, Yang and Ostendorf, Mari and Hale, John and
            Krasnyanskaya, Anna and others},
    booktitle={Proceedings of LREC},

We no longer distribute evalb with the parser since it sometimes skips sentences unnecessarily. Sparseval does not have these issues.

More questions?

There is more information about different components of the parser spread across README files in this distribution (see below). BLLIP Parser is maintained by David McClosky.

Parser details

For details on the running the parser, see first-stage/README.rst. For help retraining the parser, see first-stage/TRAIN/README.rst (also includes some information about the parser model file formats).

Reranker details

See second-stage/README for an overview. second-stage/README-retrain.rst details how to retrain the reranker. The second-stage/programs/*/README files include additional notes about different reranker components.

Other versions of the parser

We haven't tested these all of these and can't support them, but they may be useful if you're working on other platforms or languages.


Parser and reranker:


Syntactic fusion:

Something went wrong with that request. Please try again.