Add multiprocess version of xmap_reader to speedup training.

Add seqbin data parser to adapt to internal 1w data training.

deep_speech_2/data_utils/audio.py

@@ -5,6 +5,8 @@ from __future__ import print_function
 
 import numpy as np
 import io
+import struct
+import re
 import soundfile
 import resampy
 from scipy import signal
@@ -114,6 +116,46 @@ class AudioSegment(object):
         data = sndfile.read(frames=end_frame - start_frame, dtype='float32')
         return cls(data, sample_rate)
 
+    @classmethod
+    def from_sequence_file(cls, filepath):
+        """Create audio segment from sequence file.
+
+        :param filepath: Filepath of sequence file.
+        :type filepath: basestring
+        :return: Audio segment instance.
+        :rtype: AudioSegment
+        """
+        # parse filepath
+        matches = re.match(r"(.+\.seqbin)_(\d+)", filepath)
+        if matches is None:
+            raise IOError("File type of %s is not supported" % filepath)
+        filename = matches.group(1)
+        fileno = int(matches.group(2))
+
+        # read headers
+        f = open(filename, 'rb')
+        version = f.read(4)
+        num_utterances = struct.unpack("i", f.read(4))[0]
+        bytes_per_header = struct.unpack("i", f.read(4))[0]
+        header_bytes = f.read(bytes_per_header * (num_utterances + 1))
+        header = [
+            struct.unpack("i", header_bytes[bytes_per_header * i:
+                                            bytes_per_header * (i + 1)])[0]
+            for i in range(num_utterances + 1)
+        ]
+
+        # read audio bytes
+        f.seek(header[fileno - 1])
+        audio_bytes = f.read(header[fileno] - header[fileno - 1])
+        f.close()
+
+        # create audio segment
+        try:
+            return cls.from_bytes(audio_bytes)
+        except Exception as e:
+            samples = np.frombuffer(audio_bytes, dtype='int16')
+            return cls(samples=samples, sample_rate=8000)
+
     @classmethod
     def from_bytes(cls, bytes):
         """Create audio segment from a byte string containing audio samples.

deep_speech_2/data_utils/data.py

@@ -7,11 +7,13 @@ from __future__ import print_function
 
 import random
 import tarfile
+import re
 import multiprocessing
 import numpy as np
 import paddle.v2 as paddle
 from threading import local
 from data_utils.utility import read_manifest
+from data_utils.utility import xmap_readers_mp
 from data_utils.augmentor.augmentation import AugmentationPipeline
 from data_utils.featurizer.speech_featurizer import SpeechFeaturizer
 from data_utils.speech import SpeechSegment
@@ -100,7 +102,14 @@ class DataGenerator(object):
                  transcription.
         :rtype: tuple of (2darray, list)
         """
-        speech_segment = SpeechSegment.from_file(filename, transcript)
+        if filename.startswith('tar:'):
+            speech_segment = SpeechSegment.from_file(
+                self._subfile_from_tar(filename), transcript)
+        elif re.findall(r".seqbin_\d+$", filename):
+            speech_segment = SpeechSegment.from_sequence_file(filename,
+                                                              transcript)
+        else:
+            speech_segment = SpeechSegment.from_file(filename, transcript)
         self._augmentation_pipeline.transform_audio(speech_segment)
         specgram, text_ids = self._speech_featurizer.featurize(speech_segment)
         specgram = self._normalizer.apply(specgram)
@@ -231,27 +240,23 @@ class DataGenerator(object):
             result[tarinfo.name] = tarinfo
         return f, result
 
-    def _get_file_object(self, file):
-        """Get file object by file path.
+    def _subfile_from_tar(self, file):
+        """Get subfile object from tar.
 
-        If file startwith tar, it will return a tar file object
+        It will return a subfile object from tar file
         and cached tar file info for next reading request.
-        It will return file directly, if the type of file is not str.
         """
-        if file.startswith('tar:'):
-            tarpath, filename = file.split(':', 1)[1].split('#', 1)
-            if 'tar2info' not in self._local_data.__dict__:
-                self._local_data.tar2info = {}
-            if 'tar2object' not in self._local_data.__dict__:
-                self._local_data.tar2object = {}
-            if tarpath not in self._local_data.tar2info:
-                object, infoes = self._parse_tar(tarpath)
-                self._local_data.tar2info[tarpath] = infoes
-                self._local_data.tar2object[tarpath] = object
-            return self._local_data.tar2object[tarpath].extractfile(
-                self._local_data.tar2info[tarpath][filename])
-        else:
-            return open(file, 'r')
+        tarpath, filename = file.split(':', 1)[1].split('#', 1)
+        if 'tar2info' not in self._local_data.__dict__:
+            self._local_data.tar2info = {}
+        if 'tar2object' not in self._local_data.__dict__:
+            self._local_data.tar2object = {}
+        if tarpath not in self._local_data.tar2info:
+            object, infoes = self._parse_tar(tarpath)
+            self._local_data.tar2info[tarpath] = infoes
+            self._local_data.tar2object[tarpath] = object
+        return self._local_data.tar2object[tarpath].extractfile(
+            self._local_data.tar2info[tarpath][filename])
 
     def _instance_reader_creator(self, manifest):
         """
@@ -266,13 +271,12 @@ class DataGenerator(object):
             for instance in manifest:
                 yield instance
 
-        def mapper(instance):
-            return self.process_utterance(
-                self._get_file_object(instance["audio_filepath"]),
-                instance["text"])
-
-        return paddle.reader.xmap_readers(
-            mapper, reader, self._num_threads, 1024, order=True)
+        return xmap_readers_mp(
+            lambda instance: self.process_utterance(instance["audio_filepath"], instance["text"]),
+            reader,
+            self._num_threads,
+            4096,
+            order=True)
 
     def _padding_batch(self, batch, padding_to=-1, flatten=False):
         """

deep_speech_2/data_utils/speech.py

@@ -44,12 +44,26 @@ class SpeechSegment(AudioSegment):
         :type filepath: basestring|file
         :param transcript: Transcript text for the speech.
         :type transript: basestring
-        :return: Audio segment instance.
-        :rtype: AudioSegment
+        :return: Speech segment instance.
+        :rtype: SpeechSegment
         """
         audio = AudioSegment.from_file(filepath)
         return cls(audio.samples, audio.sample_rate, transcript)
 
+    @classmethod
+    def from_sequence_file(cls, filepath, transcript):
+        """Create speech segment from sequence file and transcript.
+        
+        :param filepath: Filepath of sequence file.
+        :type filepath: basestring
+        :param transcript: Transcript text for the speech.
+        :type transript: basestring
+        :return: Speech segment instance.
+        :rtype: SpeechSegment
+        """
+        audio = AudioSegment.from_sequence_file(filepath)
+        return cls(audio.samples, audio.sample_rate, transcript)
+
     @classmethod
     def from_bytes(cls, bytes, transcript):
         """Create speech segment from a byte string and corresponding
@@ -59,8 +73,8 @@ class SpeechSegment(AudioSegment):
         :type bytes: str
         :param transcript: Transcript text for the speech.
         :type transript: basestring
-        :return: Audio segment instance.
-        :rtype: AudioSegment
+        :return: Speech segment instance.
+        :rtype: Speech Segment
         """
         audio = AudioSegment.from_bytes(bytes)
         return cls(audio.samples, audio.sample_rate, transcript)

deep_speech_2/data_utils/utility.py

@@ -7,6 +7,9 @@ import json
 import codecs
 import os
 import tarfile
+import time
+from Queue import Queue
+from multiprocessing import Process, Manager
 from paddle.v2.dataset.common import md5file
 
 
@@ -61,3 +64,98 @@ def unpack(filepath, target_dir, rm_tar=False):
     tar.close()
     if rm_tar == True:
         os.remove(filepath)
+
+
+class XmapEndSignal():
+    pass
+
+
+def xmap_readers_mp(mapper, reader, process_num, buffer_size, order=False):
+    """A multiprocessing pipeline wrapper for the data reader.
+
+    :param mapper:  Function to map sample.
+    :type mapper: callable
+    :param reader: Given data reader.
+    :type reader: callable
+    :param process_num: Number of processes in the pipeline
+    :type process_num: int
+    :param buffer_size: Maximal buffer size.
+    :type buffer_size: int
+    :param order: Reserve the order of samples from the given reader.
+    :type order: bool
+    :return: The wrappered reader
+    :rtype: callable
+    """
+    end_flag = XmapEndSignal()
+
+    # define a worker to read samples from reader to in_queue
+    def read_worker(reader, in_queue):
+        for sample in reader():
+            in_queue.put(sample)
+        in_queue.put(end_flag)
+
+    # define a worker to read samples from reader to in_queue with order flag
+    def order_read_worker(reader, in_queue):
+        for order_id, sample in enumerate(reader()):
+            in_queue.put((order_id, sample))
+        in_queue.put(end_flag)
+
+    # define a worker to handle samples from in_queue by mapper and put results to out_queue
+    def handle_worker(in_queue, out_queue, mapper):
+        sample = in_queue.get()
+        while not isinstance(sample, XmapEndSignal):
+            out_queue.put(mapper(sample))
+            sample = in_queue.get()
+        in_queue.put(end_flag)
+        out_queue.put(end_flag)
+
+    # define a worker to handle samples from in_queue by mapper and put results to out_queue with order
+    def order_handle_worker(in_queue, out_queue, mapper, out_order):
+        ins = in_queue.get()
+        while not isinstance(ins, XmapEndSignal):
+            order_id, sample = ins
+            result = mapper(sample)
+            while order_id != out_order[0]:
+                time.sleep(0.001)
+            out_queue.put(result)
+            out_order[0] += 1
+            ins = in_queue.get()
+        in_queue.put(end_flag)
+        out_queue.put(end_flag)
+
+    def xreader():
+        # prepare shared memory
+        manager = Manager()
+        in_queue = manager.Queue(buffer_size)
+        out_queue = manager.Queue(buffer_size)
+        out_order = manager.list([0])
+
+        # start a read worker in a process
+        target = order_read_worker if order else read_worker
+        p = Process(target=target, args=(reader, in_queue))
+        p.start()
+
+        # start handle_workers with multiple processes
+        target = order_handle_worker if order else handle_worker
+        args = (in_queue, out_queue, mapper, out_order) if order else (
+            in_queue, out_queue, mapper)
+        workers = [
+            Process(target=target, args=args) for _ in xrange(process_num)
+        ]
+        for w in workers:
+            w.start()
+
+        # get results
+        sample = out_queue.get()
+        while not isinstance(sample, XmapEndSignal):
+            yield sample
+            sample = out_queue.get()
+        finish = 1
+        while finish < process_num:
+            sample = out_queue.get()
+            if isinstance(sample, XmapEndSignal):
+                finish += 1
+            else:
+                yield sample
+
+    return xreader