Apertium-recursive

A recursive structural transfer module for Apertium

Compiling

./autogen.sh
make

Running

# compile the rules file
src/rtx-comp rule-file bytecode-file

# run the rules
src/rtx-proc bytecode-file < input

# decompile the rules and examine the bytecode
src/rtx-decomp bytecode-file text-file

# compile XML rule files
src/trx-comp bytecode-file xml-files...

# generate random sentences from a rules file
apertium-recursive/src/randsen.py start_node pair_directory source_language_directory

Options for rtx-comp:

• -e don't compile a rule with a particular name
• -l load lexicalized weights from a file
• -s output summaries of the rules to stderr

Options for trx-comp:

• -l load lexicalized weights from a file

Options for rtx-proc:

• -a indicates that the input comes from apertium-anaphora
• -f trace which parse branches are discarded
• -r print which rules are applying
• -s trace the execution of the bytecode interpreter
• -t mimic the behavior of apertium-transfer and apertium-interchunk
• -T print the parse tree rather than applying output rules
• -b print both the parse tree and the output
• -m set the mode of tree output, available modes are:
  • nest (default) print the tree as text indented with tabs
  • flat print the tree as text
  • latex print the tree as LaTeX source using the forest library
  • dot print the tree as a Dot graph
  • box print the tree using box-drawing characters
• -e a combination of -f and -r
  • Intended use: rtx-proc -e -m latex rules.bin < input.txt 2> trace.tex
• -F filter branches for things besides parse errors (experimental)

Testing

make test

Using in a Pair

In Makefile.am add:

$(PREFIX1).rtx.bin: $(BASENAME).$(PREFIX1).rtx
	rtx-comp $< $@

$(PREFIX2).rtx.bin: $(BASENAME).$(PREFIX2).rtx
	rtx-comp $< $@

and add

$(PREFIX1).rtx.bin \
$(PREFIX2).rtx.bin

to TARGETS_COMMON.

In modes.xml, replace apertium-transfer, apertium-interchunk, and apertium-postchunk with:

<program name="rtx-proc">
  <file name="abc-xyz.rtx.bin"/>
</program>

Documentation

• GSoC project proposal: https://wiki.apertium.org/wiki/User:Popcorndude/Recursive_Transfer
• File format documentation: https://wiki.apertium.org/wiki/Apertium-recursive/Formalism
• Bytecode documentation: https://wiki.apertium.org/wiki/Apertium-recursive/Bytecode
• Progress reports: https://wiki.apertium.org/wiki/User:Popcorndude/Recursive_Transfer/Progress and apertium#1
• Examples of functioning rule sets can be found in apertium-eng-kir, eng-spa.rtx, and tests/