Fix #2830 - Support for unlabeled samples

bin/build_sdb.py

@@ -26,8 +26,8 @@ AUDIO_TYPE_LOOKUP = {
 
 def build_sdb():
     audio_type = AUDIO_TYPE_LOOKUP[CLI_ARGS.audio_type]
-    with DirectSDBWriter(CLI_ARGS.target, audio_type=audio_type) as sdb_writer:
+    with DirectSDBWriter(CLI_ARGS.target, audio_type=audio_type, labeled=not CLI_ARGS.unlabeled) as sdb_writer:
-        samples = samples_from_files(CLI_ARGS.sources)
+        samples = samples_from_files(CLI_ARGS.sources, labeled=not CLI_ARGS.unlabeled)
         bar = progressbar.ProgressBar(max_value=len(samples), widgets=SIMPLE_BAR)
         for sample in bar(change_audio_types(samples, audio_type=audio_type, processes=CLI_ARGS.workers)):
             sdb_writer.add(sample)
@@ -36,13 +36,18 @@ def build_sdb():
 def handle_args():
     parser = argparse.ArgumentParser(description='Tool for building Sample Databases (SDB files) '
                                                  'from DeepSpeech CSV files and other SDB files')
-    parser.add_argument('sources', nargs='+', help='Source CSV and/or SDB files - '
+    parser.add_argument('sources', nargs='+',
-                                                   'Note: For getting a correctly ordered target SDB, source SDBs have '
+                        help='Source CSV and/or SDB files - '
-                                                   'to have their samples already ordered from shortest to longest.')
+                             'Note: For getting a correctly ordered target SDB, source SDBs have to have their samples '
+                             'already ordered from shortest to longest.')
     parser.add_argument('target', help='SDB file to create')
     parser.add_argument('--audio-type', default='opus', choices=AUDIO_TYPE_LOOKUP.keys(),
                         help='Audio representation inside target SDB')
-    parser.add_argument('--workers', type=int, default=None, help='Number of encoding SDB workers')
+    parser.add_argument('--workers', type=int, default=None,
+                        help='Number of encoding SDB workers')
+    parser.add_argument('--unlabeled', action='store_true',
+                        help='If to build an SDB with unlabeled (audio only) samples - '
+                             'typically used for building noise augmentation corpora')
     return parser.parse_args()
 
 

bin/play.py

@@ -14,7 +14,7 @@ sys.path.insert(1, os.path.join(sys.path[0], '..'))
 import random
 import argparse
 
-from util.sample_collections import samples_from_file
+from util.sample_collections import samples_from_file, LabeledSample
 from util.audio import AUDIO_TYPE_PCM
 
 
@@ -28,6 +28,7 @@ def play_sample(samples, index):
         sys.exit(1)
     sample = samples[index]
     print('Sample "{}"'.format(sample.sample_id))
+    if isinstance(sample, LabeledSample):
         print('  "{}"'.format(sample.transcript))
     sample.change_audio_type(AUDIO_TYPE_PCM)
     rate, channels, width = sample.audio_format

util/audio.py

@@ -26,31 +26,45 @@ OPUS_CHUNK_LEN_SIZE = 2
 
 
 class Sample:
-    """Represents in-memory audio data of a certain (convertible) representation.
-    Attributes:
-        audio_type (str): See `__init__`.
-        audio_format (tuple:(int, int, int)): See `__init__`.
-        audio (obj): Audio data represented as indicated by `audio_type`
-        duration (float): Audio duration of the sample in seconds
     """
-    def __init__(self, audio_type, raw_data, audio_format=None):
+    Represents in-memory audio data of a certain (convertible) representation.
+
+    Attributes
+    ----------
+    audio_type : str
+        See `__init__`.
+    audio_format : tuple:(int, int, int)
+        See `__init__`.
+    audio : binary
+        Audio data represented as indicated by `audio_type`
+    duration : float
+        Audio duration of the sample in seconds
     """
-        Creates a Sample from a raw audio representation.
+    def __init__(self, audio_type, raw_data, audio_format=None, sample_id=None):
-        :param audio_type: Audio data representation type
+        """
+        Parameters
+        ----------
+        audio_type : str
+            Audio data representation type
             Supported types:
-                - AUDIO_TYPE_OPUS: Memory file representation (BytesIO) of Opus encoded audio
+                - util.audio.AUDIO_TYPE_OPUS: Memory file representation (BytesIO) of Opus encoded audio
                     wrapped by a custom container format (used in SDBs)
-                - AUDIO_TYPE_WAV: Memory file representation (BytesIO) of a Wave file
+                - util.audio.AUDIO_TYPE_WAV: Memory file representation (BytesIO) of a Wave file
-                - AUDIO_TYPE_PCM: Binary representation (bytearray) of PCM encoded audio data (Wave file without header)
+                - util.audio.AUDIO_TYPE_PCM: Binary representation (bytearray) of PCM encoded audio data (Wave file without header)
-                - AUDIO_TYPE_NP: NumPy representation of audio data (np.float32) - typically used for GPU feeding
+                - util.audio.AUDIO_TYPE_NP: NumPy representation of audio data (np.float32) - typically used for GPU feeding
-        :param raw_data: Audio data in the form of the provided representation type (see audio_type).
+        raw_data : binary
-            For types AUDIO_TYPE_OPUS or AUDIO_TYPE_WAV data can also be passed as a bytearray.
+            Audio data in the form of the provided representation type (see audio_type).
-        :param audio_format: Tuple of sample-rate, number of channels and sample-width.
+            For types util.audio.AUDIO_TYPE_OPUS or util.audio.AUDIO_TYPE_WAV data can also be passed as a bytearray.
-            Required in case of audio_type = AUDIO_TYPE_PCM or AUDIO_TYPE_NP,
+        audio_format : tuple
+            Tuple of sample-rate, number of channels and sample-width.
+            Required in case of audio_type = util.audio.AUDIO_TYPE_PCM or util.audio.AUDIO_TYPE_NP,
             as this information cannot be derived from raw audio data.
+        sample_id : str
+            Tracking ID - should indicate sample's origin as precisely as possible
         """
         self.audio_type = audio_type
         self.audio_format = audio_format
+        self.sample_id = sample_id
         if audio_type in SERIALIZABLE_AUDIO_TYPES:
             self.audio = raw_data if isinstance(raw_data, io.BytesIO) else io.BytesIO(raw_data)
             self.duration = read_duration(audio_type, self.audio)
@@ -68,7 +82,11 @@ class Sample:
     def change_audio_type(self, new_audio_type):
         """
         In-place conversion of audio data into a different representation.
-        :param new_audio_type: New audio-type - see `__init__`.
+
+        Parameters
+        ----------
+        new_audio_type : str
+            New audio-type - see `__init__`.
             Not supported: Converting from AUDIO_TYPE_NP into any other type.
         """
         if self.audio_type == new_audio_type:

util/feeding.py

@@ -116,7 +116,7 @@ def create_dataset(sources,
                    process_ahead=None,
                    buffering=1 * MEGABYTE):
     def generate_values():
-        samples = samples_from_files(sources, buffering=buffering)
+        samples = samples_from_files(sources, buffering=buffering, labeled=True)
         for sample in change_audio_types(samples,
                                          AUDIO_TYPE_NP,
                                          process_ahead=2 * batch_size if process_ahead is None else process_ahead):

util/sample_collections.py

@@ -29,23 +29,45 @@ class LabeledSample(Sample):
     Derived from util.audio.Sample and used by sample collection readers and writers."""
     def __init__(self, audio_type, raw_data, transcript, audio_format=DEFAULT_FORMAT, sample_id=None):
         """
-        Creates an in-memory speech sample together with a transcript of the utterance (label).
+        Parameters
-        :param audio_type: See util.audio.Sample.__init__ .
+        ----------
-        :param raw_data: See util.audio.Sample.__init__ .
+        audio_type : str
-        :param transcript: Transcript of the sample's utterance
+            See util.audio.Sample.__init__ .
-        :param audio_format: See util.audio.Sample.__init__ .
+        raw_data : binary
-        :param sample_id: Tracking ID - typically assigned by collection readers
+            See util.audio.Sample.__init__ .
+        transcript : str
+            Transcript of the sample's utterance
+        audio_format : tuple
+            See util.audio.Sample.__init__ .
+        sample_id : str
+            Tracking ID - should indicate sample's origin as precisely as possible.
+            It is typically assigned by collection readers.
         """
-        super().__init__(audio_type, raw_data, audio_format=audio_format)
+        super().__init__(audio_type, raw_data, audio_format=audio_format, sample_id=sample_id)
-        self.sample_id = sample_id
         self.transcript = transcript
 
 
 class DirectSDBWriter:
     """Sample collection writer for creating a Sample DB (SDB) file"""
-    def __init__(self, sdb_filename, buffering=BUFFER_SIZE, audio_type=AUDIO_TYPE_OPUS, id_prefix=None):
+    def __init__(self, sdb_filename, buffering=BUFFER_SIZE, audio_type=AUDIO_TYPE_OPUS, id_prefix=None, labeled=True):
+        """
+        Parameters
+        ----------
+        sdb_filename : str
+            Path to the SDB file to write
+        buffering : int
+            Write-buffer size to use while writing the SDB file
+        audio_type : str
+            See util.audio.Sample.__init__ .
+        id_prefix : str
+            Prefix for IDs of written samples - defaults to sdb_filename
+        labeled : bool or None
+            If True: Writes labeled samples (util.sample_collections.LabeledSample) only.
+            If False: Ignores transcripts (if available) and writes (unlabeled) util.audio.Sample instances.
+        """
         self.sdb_filename = sdb_filename
         self.id_prefix = sdb_filename if id_prefix is None else id_prefix
+        self.labeled = labeled
         if audio_type not in SERIALIZABLE_AUDIO_TYPES:
             raise ValueError('Audio type "{}" not supported'.format(audio_type))
         self.audio_type = audio_type
@@ -55,12 +77,10 @@ class DirectSDBWriter:
 
         self.sdb_file.write(MAGIC)
 
-        meta_data = {
+        schema_entries = [{CONTENT_KEY: CONTENT_TYPE_SPEECH, MIME_TYPE_KEY: audio_type}]
-            SCHEMA_KEY: [
+        if self.labeled:
-                {CONTENT_KEY: CONTENT_TYPE_SPEECH, MIME_TYPE_KEY: audio_type},
+            schema_entries.append({CONTENT_KEY: CONTENT_TYPE_TRANSCRIPT, MIME_TYPE_KEY: MIME_TYPE_TEXT})
-                {CONTENT_KEY: CONTENT_TYPE_TRANSCRIPT, MIME_TYPE_KEY: MIME_TYPE_TEXT}
+        meta_data = {SCHEMA_KEY: schema_entries}
-            ]
-        }
         meta_data = json.dumps(meta_data).encode()
         self.write_big_int(len(meta_data))
         self.sdb_file.write(meta_data)
@@ -83,10 +103,14 @@ class DirectSDBWriter:
         sample.change_audio_type(self.audio_type)
         opus = sample.audio.getbuffer()
         opus_len = to_bytes(len(opus))
+        if self.labeled:
             transcript = sample.transcript.encode()
             transcript_len = to_bytes(len(transcript))
             entry_len = to_bytes(len(opus_len) + len(opus) + len(transcript_len) + len(transcript))
             buffer = b''.join([entry_len, opus_len, opus, transcript_len, transcript])
+        else:
+            entry_len = to_bytes(len(opus_len) + len(opus))
+            buffer = b''.join([entry_len, opus_len, opus])
         self.offsets.append(self.sdb_file.tell())
         self.sdb_file.write(buffer)
         sample.sample_id = '{}:{}'.format(self.id_prefix, self.num_samples)
@@ -120,7 +144,22 @@ class DirectSDBWriter:
 
 class SDB:  # pylint: disable=too-many-instance-attributes
     """Sample collection reader for reading a Sample DB (SDB) file"""
-    def __init__(self, sdb_filename, buffering=BUFFER_SIZE, id_prefix=None):
+    def __init__(self, sdb_filename, buffering=BUFFER_SIZE, id_prefix=None, labeled=True):
+        """
+        Parameters
+        ----------
+        sdb_filename : str
+            Path to the SDB file to read samples from
+        buffering : int
+            Read-buffer size to use while reading the SDB file
+        id_prefix : str
+            Prefix for IDs of read samples - defaults to sdb_filename
+        labeled : bool or None
+            If True: Reads util.sample_collections.LabeledSample instances. Fails, if SDB file provides no transcripts.
+            If False: Ignores transcripts (if available) and reads (unlabeled) util.audio.Sample instances.
+            If None: Automatically determines if SDB schema has transcripts
+            (reading util.sample_collections.LabeledSample instances) or not (reading util.audio.Sample instances).
+        """
         self.sdb_filename = sdb_filename
         self.id_prefix = sdb_filename if id_prefix is None else id_prefix
         self.sdb_file = open(sdb_filename, 'rb', buffering=buffering)
@@ -139,10 +178,14 @@ class SDB:  # pylint: disable=too-many-instance-attributes
         self.speech_index = speech_columns[0]
         self.audio_type = self.schema[self.speech_index][MIME_TYPE_KEY]
 
+        self.transcript_index = None
+        if labeled is not False:
             transcript_columns = self.find_columns(content=CONTENT_TYPE_TRANSCRIPT, mime_type=MIME_TYPE_TEXT)
-        if not transcript_columns:
+            if transcript_columns:
-            raise RuntimeError('No transcript data (missing in schema)')
                 self.transcript_index = transcript_columns[0]
+            else:
+                if labeled is True:
+                    raise RuntimeError('No transcript data (missing in schema)')
 
         sample_chunk_len = self.read_big_int()
         self.sdb_file.seek(sample_chunk_len + BIGINT_SIZE, 1)
@@ -194,9 +237,12 @@ class SDB:  # pylint: disable=too-many-instance-attributes
         return tuple(column_data)
 
     def __getitem__(self, i):
+        sample_id = '{}:{}'.format(self.id_prefix, i)
+        if self.transcript_index is None:
+            [audio_data] = self.read_row(i, self.speech_index)
+            return Sample(self.audio_type, audio_data, sample_id=sample_id)
         audio_data, transcript = self.read_row(i, self.speech_index, self.transcript_index)
         transcript = transcript.decode()
-        sample_id = '{}:{}'.format(self.id_prefix, i)
         return LabeledSample(self.audio_type, audio_data, transcript, sample_id=sample_id)
 
     def __iter__(self):
@@ -215,24 +261,50 @@ class SDB:  # pylint: disable=too-many-instance-attributes
 
 
 class CSV:
-    """Sample collection reader for reading a DeepSpeech CSV file"""
+    """Sample collection reader for reading a DeepSpeech CSV file
-    def __init__(self, csv_filename):
+    Automatically orders samples by CSV column wav_filesize (if available)."""
+    def __init__(self, csv_filename, labeled=None):
+        """
+        Parameters
+        ----------
+        csv_filename : str
+            Path to the CSV file containing sample audio paths and transcripts
+        labeled : bool or None
+            If True: Reads LabeledSample instances. Fails, if CSV file has no transcript column.
+            If False: Ignores transcripts (if available) and reads (unlabeled) util.audio.Sample instances.
+            If None: Automatically determines if CSV file has a transcript column
+            (reading util.sample_collections.LabeledSample instances) or not (reading util.audio.Sample instances).
+        """
         self.csv_filename = csv_filename
+        self.labeled = labeled
         self.rows = []
         csv_dir = Path(csv_filename).parent
         with open(csv_filename, 'r', encoding='utf8') as csv_file:
             reader = csv.DictReader(csv_file)
+            if 'transcript' in reader.fieldnames:
+                if self.labeled is None:
+                    self.labeled = True
+            elif self.labeled:
+                raise RuntimeError('No transcript data (missing CSV column)')
             for row in reader:
                 wav_filename = Path(row['wav_filename'])
                 if not wav_filename.is_absolute():
                     wav_filename = csv_dir / wav_filename
-                self.rows.append((str(wav_filename), int(row['wav_filesize']), row['transcript']))
+                wav_filename = str(wav_filename)
+                wav_filesize = int(row['wav_filesize']) if 'wav_filesize' in row else 0
+                if self.labeled:
+                    self.rows.append((wav_filename, wav_filesize, row['transcript']))
+                else:
+                    self.rows.append((wav_filename, wav_filesize))
         self.rows.sort(key=lambda r: r[1])
 
     def __getitem__(self, i):
-        wav_filename, _, transcript = self.rows[i]
+        row = self.rows[i]
+        wav_filename = row[0]
         with open(wav_filename, 'rb') as wav_file:
-            return LabeledSample(AUDIO_TYPE_WAV, wav_file.read(), transcript, sample_id=wav_filename)
+            if self.labeled:
+                return LabeledSample(AUDIO_TYPE_WAV, wav_file.read(), row[2], sample_id=wav_filename)
+            return Sample(AUDIO_TYPE_WAV, wav_file.read(), sample_id=wav_filename)
 
     def __iter__(self):
         for i in range(len(self.rows)):
@@ -242,21 +314,52 @@ class CSV:
         return len(self.rows)
 
 
-def samples_from_file(filename, buffering=BUFFER_SIZE):
+def samples_from_file(filename, buffering=BUFFER_SIZE, labeled=None):
-    """Returns an iterable of LabeledSample objects loaded from a file."""
+    """
+    Returns an iterable of util.sample_collections.LabeledSample or util.audio.Sample instances
+    loaded from a sample source file.
+
+    Parameters
+    ----------
+    filename : str
+        Path to the sample source file (SDB or CSV)
+    buffering : int
+        Read-buffer size to use while reading files
+    labeled : bool or None
+        If True: Reads LabeledSample instances. Fails, if source provides no transcripts.
+        If False: Ignores transcripts (if available) and reads (unlabeled) util.audio.Sample instances.
+        If None: Automatically determines if source provides transcripts
+        (reading util.sample_collections.LabeledSample instances) or not (reading util.audio.Sample instances).
+    """
     ext = os.path.splitext(filename)[1].lower()
     if ext == '.sdb':
-        return SDB(filename, buffering=buffering)
+        return SDB(filename, buffering=buffering, labeled=labeled)
     if ext == '.csv':
-        return CSV(filename)
+        return CSV(filename, labeled=labeled)
     raise ValueError('Unknown file type: "{}"'.format(ext))
 
 
-def samples_from_files(filenames, buffering=BUFFER_SIZE):
+def samples_from_files(filenames, buffering=BUFFER_SIZE, labeled=None):
-    """Returns an iterable of LabeledSample objects from a list of files."""
+    """
+    Returns an iterable of util.sample_collections.LabeledSample or util.audio.Sample instances
+    loaded from a collection of sample source files.
+
+    Parameters
+    ----------
+    filenames : list of str
+        Paths to sample source files (SDBs or CSVs)
+    buffering : int
+        Read-buffer size to use while reading files
+    labeled : bool or None
+        If True: Reads LabeledSample instances. Fails, if not all sources provide transcripts.
+        If False: Ignores transcripts (if available) and always reads (unlabeled) util.audio.Sample instances.
+        If None: Reads util.sample_collections.LabeledSample instances from sources with transcripts and
+        util.audio.Sample instances from sources with no transcripts.
+    """
+    filenames = list(filenames)
     if len(filenames) == 0:
         raise ValueError('No files')
     if len(filenames) == 1:
-        return samples_from_file(filenames[0], buffering=buffering)
+        return samples_from_file(filenames[0], buffering=buffering, labeled=labeled)
-    cols = list(map(partial(samples_from_file, buffering=buffering), filenames))
+    cols = list(map(partial(samples_from_file, buffering=buffering, labeled=labeled), filenames))
     return Interleaved(*cols, key=lambda s: s.duration)