Penman 0.8.0

This package models graphs encoded in PENMAN notation (e.g., AMR), such as the following for the boy wants to go:

(w / want-01
   :ARG0 (b / boy)
   :ARG1 (g / go
            :ARG0 b))

The Penman package may be used as a Python library or as a script.

Features

• Read and write PENMAN-serialized graphs or triple conjunctions
• Read metadata in comments (e.g., # ::id 1234)
• Read surface alignments (e.g., foo~e.1,2)
• Inspect and manipulate the graph or tree structures
• Customize graphs for writing:
  • adjust indentation and compactness
  • select a new top node
  • rearrange edges
  • restructure the tree shape
• Transform the graph
  • Canonicalize roles
  • Reify edges
  • Reify attributes
  • Embed the tree structure with additional TOP triples
• AMR model: role inventory and transformations
• Tested (but not yet 100% coverage)
• Documented (see the documentation)

Library Usage

>>> import penman
>>> g = penman.decode('(b / bark :ARG0 (d / dog))')
>>> g.triples
[('b', ':instance', 'bark'), ('b', ':ARG0', 'd'), ('d', ':instance', 'dog')]
>>> print(penman.encode(g))
(b / bark
   :ARG0 (d / dog))
>>> print(penman.encode(g, top='d', indent=6))
(d / dog
      :ARG0-of (b / bark))
>>> print(penman.encode(g, indent=False))
(b / bark :ARG0 (d / dog))

Script Usage

$ penman --help
usage: penman [-h] [-V] [--model FILE | --amr] [--indent N] [--compact]
              [--triples] [--canonicalize-roles] [--reify-edges]
              [--reify-attributes] [--indicate-branches]
              [FILE [FILE ...]]

Read and write graphs in the PENMAN notation.

positional arguments:
  FILE                  read graphs from FILEs instead of stdin

optional arguments:
  -h, --help            show this help message and exit
  -V, --version         show program's version number and exit
  --model FILE          JSON model file describing the semantic model
  --amr                 use the AMR model

formatting options:
  --indent N            indent N spaces per level ("no" for no newlines)
  --compact             compactly print node attributes on one line
  --triples             print graphs as triple conjunctions

normalization options:
  --canonicalize-roles  canonicalize role forms
  --reify-edges         reify all eligible edges
  --reify-attributes    reify all attributes
  --indicate-branches   insert triples to indicate tree structure

$ penman <<< "(w / want-01 :ARG0 (b / boy) :ARG1 (g / go :ARG0 b))"
(w / want-01
   :ARG0 (b / boy)
   :ARG1 (g / go
            :ARG0 b))

Requirements

• Python 3.6+

PENMAN Notation

A description of the PENMAN notation can be found in the documentation. See also Nathan Schneider's PEG for AMR.

This module expands the notation slightly to allow for untyped nodes (e.g., (x)) and anonymous relations (e.g., (x : (y))). It also accommodates slightly malformed graphs as well as surface alignments.

Disclaimer

This project is not affiliated with ISI, the PENMAN project, or the AMR project.