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-rw-r--r--python/pkg/cdec/sa/__init__.py6
-rw-r--r--python/pkg/cdec/sa/extract.py35
-rw-r--r--python/pkg/cdec/sa/extractor.py5
-rw-r--r--python/pkg/cdec/sa/features.py52
4 files changed, 61 insertions, 37 deletions
diff --git a/python/pkg/cdec/sa/__init__.py b/python/pkg/cdec/sa/__init__.py
index ab8be809..cc532fb9 100644
--- a/python/pkg/cdec/sa/__init__.py
+++ b/python/pkg/cdec/sa/__init__.py
@@ -2,3 +2,9 @@ from cdec.sa._sa import sym_fromstring,\
SuffixArray, DataArray, LCP, Precomputation, Alignment, BiLex,\
HieroCachingRuleFactory, Sampler, Scorer
from cdec.sa.extractor import GrammarExtractor
+
+_SA_FEATURES = []
+
+def feature(fn):
+ _SA_FEATURES.append(fn)
+ return fn
diff --git a/python/pkg/cdec/sa/extract.py b/python/pkg/cdec/sa/extract.py
index 39eac824..b370c4ca 100644
--- a/python/pkg/cdec/sa/extract.py
+++ b/python/pkg/cdec/sa/extract.py
@@ -8,12 +8,20 @@ import signal
import cdec.sa
extractor, prefix = None, None
-def make_extractor(config, grammars):
+def make_extractor(config, grammars, features):
global extractor, prefix
signal.signal(signal.SIGINT, signal.SIG_IGN) # Let parent process catch Ctrl+C
+ if features: load_features(features)
extractor = cdec.sa.GrammarExtractor(config)
prefix = grammars
+def load_features(features):
+ logging.info('Loading additional feature definitions from %s', features)
+ prefix = os.path.dirname(features)
+ sys.path.append(prefix)
+ __import__(os.path.basename(features).replace('.py', ''))
+ sys.path.remove(prefix)
+
def extract(inp):
global extractor, prefix
i, sentence = inp
@@ -25,7 +33,6 @@ def extract(inp):
grammar_file = os.path.abspath(grammar_file)
return '<seg grammar="{0}" id="{1}">{2}</seg>'.format(grammar_file, i, sentence)
-
def main():
logging.basicConfig(level=logging.INFO)
parser = argparse.ArgumentParser(description='Extract grammars from a compiled corpus.')
@@ -37,18 +44,28 @@ def main():
help='number of parallel extractors')
parser.add_argument('-s', '--chunksize', type=int, default=10,
help='number of sentences / chunk')
+ parser.add_argument('-f', '--features', type=str, default=None,
+ help='additional feature definitions')
args = parser.parse_args()
if not os.path.exists(args.grammars):
os.mkdir(args.grammars)
-
- logging.info('Starting %d workers; chunk size: %d', args.jobs, args.chunksize)
- pool = mp.Pool(args.jobs, make_extractor, (args.config, args.grammars))
- try:
- for output in pool.imap(extract, enumerate(sys.stdin), args.chunksize):
+ if not args.features.endswith('.py'):
+ sys.stderr.write('Error: feature definition file should be a python module\n')
+ sys.exit(1)
+
+ if args.jobs > 1:
+ logging.info('Starting %d workers; chunk size: %d', args.jobs, args.chunksize)
+ pool = mp.Pool(args.jobs, make_extractor, (args.config, args.grammars, args.features))
+ try:
+ for output in pool.imap(extract, enumerate(sys.stdin), args.chunksize):
+ print(output)
+ except KeyboardInterrupt:
+ pool.terminate()
+ else:
+ make_extractor(args.config, args.grammars, args.features)
+ for output in map(extract, enumerate(sys.stdin)):
print(output)
- except KeyboardInterrupt:
- pool.terminate()
if __name__ == '__main__':
main()
diff --git a/python/pkg/cdec/sa/extractor.py b/python/pkg/cdec/sa/extractor.py
index 90cc4c51..89e35bf8 100644
--- a/python/pkg/cdec/sa/extractor.py
+++ b/python/pkg/cdec/sa/extractor.py
@@ -9,7 +9,7 @@ import cdec.sa
MAX_INITIAL_SIZE = 15
class GrammarExtractor:
- def __init__(self, config):
+ def __init__(self, config, features=None):
if isinstance(config, str) or isinstance(config, unicode):
if not os.path.exists(config):
raise IOError('cannot read configuration from {0}'.format(config))
@@ -58,7 +58,8 @@ class GrammarExtractor:
tt = cdec.sa.BiLex(from_binary=config['lex_file'])
scorer = cdec.sa.Scorer(EgivenFCoherent, SampleCountF, CountEF,
- MaxLexFgivenE(tt), MaxLexEgivenF(tt), IsSingletonF, IsSingletonFE)
+ MaxLexFgivenE(tt), MaxLexEgivenF(tt), IsSingletonF, IsSingletonFE,
+ *cdec.sa._SA_FEATURES)
fsarray = cdec.sa.SuffixArray(from_binary=config['f_sa_file'])
edarray = cdec.sa.DataArray(from_binary=config['e_file'])
diff --git a/python/pkg/cdec/sa/features.py b/python/pkg/cdec/sa/features.py
index 8fd370cc..a4ae23e8 100644
--- a/python/pkg/cdec/sa/features.py
+++ b/python/pkg/cdec/sa/features.py
@@ -3,55 +3,55 @@ import math
MAXSCORE = 99
-def EgivenF(fphrase, ephrase, paircount, fcount, fsample_count): # p(e|f)
- return -math.log10(paircount/fcount)
+def EgivenF(ctx): # p(e|f) = c(e, f)/c(f)
+ return -math.log10(ctx.paircount/ctx.fcount)
-def CountEF(fphrase, ephrase, paircount, fcount, fsample_count):
- return math.log10(1 + paircount)
+def CountEF(ctx): # c(e, f)
+ return math.log10(1 + ctx.paircount)
-def SampleCountF(fphrase, ephrase, paircount, fcount, fsample_count):
- return math.log10(1 + fsample_count)
+def SampleCountF(ctx): # sample c(f)
+ return math.log10(1 + ctx.fsample_count)
-def EgivenFCoherent(fphrase, ephrase, paircount, fcount, fsample_count):
- prob = paircount/fsample_count
+def EgivenFCoherent(ctx): # c(e, f) / sample c(f)
+ prob = ctx.paircount/ctx.fsample_count
return -math.log10(prob) if prob > 0 else MAXSCORE
-def CoherenceProb(fphrase, ephrase, paircount, fcount, fsample_count):
- return -math.log10(fcount/fsample_count)
+def CoherenceProb(ctx): # c(f) / sample c(f)
+ return -math.log10(ctx.fcount/ctx.fsample_count)
def MaxLexEgivenF(ttable):
- def MaxLexEgivenF(fphrase, ephrase, paircount, fcount, fsample_count):
- fwords = fphrase.words
+ def MaxLexEgivenF(ctx):
+ fwords = ctx.fphrase.words
fwords.append('NULL')
def score():
- for e in ephrase.words:
+ for e in ctx.ephrase.words:
maxScore = max(ttable.get_score(f, e, 0) for f in fwords)
yield -math.log10(maxScore) if maxScore > 0 else MAXSCORE
return sum(score())
return MaxLexEgivenF
def MaxLexFgivenE(ttable):
- def MaxLexFgivenE(fphrase, ephrase, paircount, fcount, fsample_count):
- ewords = ephrase.words
+ def MaxLexFgivenE(ctx):
+ ewords = ctx.ephrase.words
ewords.append('NULL')
def score():
- for f in fphrase.words:
+ for f in ctx.fphrase.words:
maxScore = max(ttable.get_score(f, e, 1) for e in ewords)
yield -math.log10(maxScore) if maxScore > 0 else MAXSCORE
return sum(score())
return MaxLexFgivenE
-def IsSingletonF(fphrase, ephrase, paircount, fcount, fsample_count):
- return (fcount == 1)
+def IsSingletonF(ctx):
+ return (ctx.fcount == 1)
-def IsSingletonFE(fphrase, ephrase, paircount, fcount, fsample_count):
- return (paircount == 1)
+def IsSingletonFE(ctx):
+ return (ctx.paircount == 1)
-def IsNotSingletonF(fphrase, ephrase, paircount, fcount, fsample_count):
- return (fcount > 1)
+def IsNotSingletonF(ctx):
+ return (ctx.fcount > 1)
-def IsNotSingletonFE(fphrase, ephrase, paircount, fcount, fsample_count):
- return (paircount > 1)
+def IsNotSingletonFE(ctx):
+ return (ctx.paircount > 1)
-def IsFEGreaterThanZero(fphrase, ephrase, paircount, fcount, fsample_count):
- return (paircount > 0.01)
+def IsFEGreaterThanZero(ctx):
+ return (ctx.paircount > 0.01)
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-11 02:40:01 +0000