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import logging
import os
import subprocess
import threading
import util
logger = logging.getLogger('rt.decoder')
class Decoder:
def close(self, force=False):
if not force:
self.lock.acquire()
self.decoder.stdin.close()
self.decoder.wait()
if not force:
self.lock.release()
def decode(self, sentence, grammar=None):
'''Threadsafe, FIFO'''
self.lock.acquire()
input = '<seg grammar="{g}">{s}</seg>\n'.format(s=sentence, g=grammar) if grammar else '{}\n'.format(sentence)
self.decoder.stdin.write(input)
hyp = self.decoder.stdout.readline().strip()
self.lock.release()
return hyp
class CdecDecoder(Decoder):
def __init__(self, config, weights):
cdec_root = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
decoder = os.path.join(cdec_root, 'decoder', 'cdec')
decoder_cmd = [decoder, '-c', config, '-w', weights]
logger.info('Executing: {}'.format(' '.join(decoder_cmd)))
self.decoder = util.popen_io(decoder_cmd)
self.lock = util.FIFOLock()
class MIRADecoder(Decoder):
def __init__(self, config, weights, metric='ibm_bleu'):
cdec_root = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
mira = os.path.join(cdec_root, 'training', 'mira', 'kbest_cut_mira')
# optimizer=2 step=0.001 best=500, k=500, uniq, stream, metric
mira_cmd = [mira, '-c', config, '-w', weights, '-o', '2', '-C', '0.001', '-b', '500', '-k', '500', '-u', '-t', '-m', metric]
logger.info('Executing: {}'.format(' '.join(mira_cmd)))
self.decoder = util.popen_io(mira_cmd)
self.lock = util.FIFOLock()
def get_weights(self):
'''Threadsafe, FIFO'''
self.lock.acquire()
self.decoder.stdin.write('WEIGHTS ||| WRITE\n')
weights = self.decoder.stdout.readline().strip()
self.lock.release()
return weights
def set_weights(self, w_line):
'''Threadsafe, FIFO'''
self.lock.acquire()
try:
# Check validity
for w_str in w_line.split():
(k, v) = w_str.split('=')
float(v)
self.decoder.stdin.write('WEIGHTS ||| {}\n'.format(w_line))
self.lock.release()
except:
self.lock.release()
raise Exception('Invalid weights line: {}'.format(w_line))
def update(self, sentence, grammar, reference):
'''Threadsafe, FIFO'''
self.lock.acquire()
input = 'LEARN ||| <seg grammar="{g}">{s}</seg> ||| {r}\n'.format(s=sentence, g=grammar, r=reference)
self.decoder.stdin.write(input)
log = self.decoder.stdout.readline().strip()
self.lock.release()
return log
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