MIRA updates in realtime.py

1 files changed, 38 insertions, 9 deletions

diff --git a/realtime/realtime.py b/realtime/realtime.py
index c169ce4c..1f67bed7 100755
--- a/realtime/realtime.py
+++ b/realtime/realtime.py
@@ -1,21 +1,24 @@
 #!/usr/bin/env python
+
 import argparse
-import os
+import collections
 import logging
-import cdec.configobj
-import cdec.sa
+import os
 import shutil
 import sys
 import subprocess
 import tempfile
 import time
 
+import cdec.configobj
+import cdec.sa
+
 from rt import ForceAligner
 from rt import MIRADecoder
 
 class RealtimeDecoder:
 
-    def __init__(self, configdir, tmpdir='/tmp'):
+    def __init__(self, configdir, tmpdir='/tmp', cache_size=5):
 
         # Temporary work dir
         self.tmp = tempfile.mkdtemp(dir=tmpdir)
@@ -31,6 +34,9 @@ class RealtimeDecoder:
         # Grammar extractor
         sa_config = os.path.join(configdir, 'sa.ini')
         self.extractor = cdec.sa.GrammarExtractor(sa_config, online=True)
+        self.grammar_files = collections.deque()
+        self.grammar_dict = {}
+        self.cache_size = cache_size
 
         # Decoder
         decoder_config = os.path.join(configdir, 'cdec.ini')
@@ -45,10 +51,24 @@ class RealtimeDecoder:
         shutil.rmtree(self.tmp)
 
     def grammar(self, sentence):
+        grammar_file = self.grammar_dict.get(sentence, None)
+        # Cache hit
+        if grammar_file:
+            logging.info('Grammar cache hit')
+            return grammar_file
+        # Extract and cache
         grammar_file = tempfile.mkstemp(dir=self.tmp)[1]
         with open(grammar_file, 'w') as output:
             for rule in self.extractor.grammar(sentence):
                 output.write(str(rule) + '\n')
+        if len(self.grammar_files) == self.cache_size:
+            rm_sent = self.grammar_files.popleft()
+            # If not already removed by learn method
+            if rm_sent in self.grammar_dict:
+                rm_grammar = self.grammar_dict.pop(rm_sent)
+                os.remove(rm_grammar)
+        self.grammar_files.append(sentence)
+        self.grammar_dict[sentence] = grammar_file
         return grammar_file
         
     def decode(self, sentence):
@@ -57,15 +77,21 @@ class RealtimeDecoder:
         hyp = self.decoder.decode(sentence, grammar_file)
         stop_time = time.time()
         logging.info('Translation time: {} seconds'.format(stop_time - start_time))
-        os.remove(grammar_file)
         return hyp
 
     def learn(self, source, target):
-        alignment = self.aligner.align('{} ||| {}'.format(source, target))
+        # MIRA update before adding data to grammar extractor
+        grammar_file = self.grammar(source)
+        mira_log = self.decoder.update(source, grammar_file, target)
+        logging.info('MIRA: {}'.format(mira_log))
+        # Add aligned sentence pair to grammar extractor
+        alignment = self.aligner.align(source, target)
         logging.info('Adding instance: {} ||| {} ||| {}'.format(source, target, alignment))
         self.extractor.add_instance(source, target, alignment)
-        # TODO: Add to LM
-        # TODO: MIRA update
+        # Clear (old) cached grammar
+        rm_grammar = self.grammar_dict.pop(source)
+        os.remove(rm_grammar)
+        # TODO: Add to LM by writing to fifo
 
 def main():
 
@@ -84,7 +110,10 @@ def main():
     rtd = RealtimeDecoder(args.config)
 
     try:
-        for line in sys.stdin:
+        while True:
+            line = sys.stdin.readline()
+            if not line:
+                break
             input = [f.strip() for f in line.split('|||')]
             if len(input) == 1:
                 hyp = rtd.decode(input[0])