From c08eef6a36534ac5b9506f5b18af1765442d3fde Mon Sep 17 00:00:00 2001
From: Michael Denkowski <mdenkows@cs.cmu.edu>
Date: Tue, 3 Sep 2013 13:47:34 -0700
Subject: Refactoring.

---
 realtime/rt/rt.py | 94 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 realtime/rt/rt.py

(limited to 'realtime/rt/rt.py')

diff --git a/realtime/rt/rt.py b/realtime/rt/rt.py
new file mode 100644
index 00000000..fc6e3929
--- /dev/null
+++ b/realtime/rt/rt.py
@@ -0,0 +1,94 @@
+#!/usr/bin/env python
+
+import argparse
+import collections
+import logging
+import os
+import shutil
+import sys
+import subprocess
+import tempfile
+import time
+
+import cdec.configobj
+import cdec.sa
+
+import aligner
+import decoder
+
+class RealtimeDecoder:
+
+    def __init__(self, configdir, tmpdir='/tmp', cache_size=5):
+
+        # Temporary work dir
+        self.tmp = tempfile.mkdtemp(dir=tmpdir, prefix='realtime.')
+        logging.info('Using temp dir {}'.format(self.tmp))
+
+        # Word aligner
+        fwd_params = os.path.join(configdir, 'a.fwd_params')
+        fwd_err = os.path.join(configdir, 'a.fwd_err')
+        rev_params = os.path.join(configdir, 'a.rev_params')
+        rev_err = os.path.join(configdir, 'a.rev_err')
+        self.aligner = aligner.ForceAligner(fwd_params, fwd_err, rev_params, rev_err)
+
+        # 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')
+        decoder_weights = os.path.join(configdir, 'weights.final')
+        self.decoder = decoder.MIRADecoder(decoder_config, decoder_weights)
+
+    def close(self):
+        logging.info('Closing processes')
+        self.aligner.close()
+        self.decoder.close()
+        logging.info('Deleting {}'.format(self.tmp))
+        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, prefix='grammar.')[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):
+        grammar_file = self.grammar(sentence)
+        start_time = time.time()
+        hyp = self.decoder.decode(sentence, grammar_file)
+        stop_time = time.time()
+        logging.info('Translation time: {} seconds'.format(stop_time - start_time))
+        return hyp
+
+    def learn(self, 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)
+        # Clear (old) cached grammar
+        rm_grammar = self.grammar_dict.pop(source)
+        os.remove(rm_grammar)
+        # TODO: Add to LM by writing to fifo
-- 
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