Merge pull request #2406 from lissyx/disable-cache-dataaug

Disable cache when data augmentation is set

DeepSpeech.py

@@ -413,10 +413,21 @@ def try_loading(session, saver, checkpoint_filename, caption):
 
 
 def train():
+    do_cache_dataset = True
+
+    # pylint: disable=too-many-boolean-expressions
+    if (FLAGS.data_aug_features_multiplicative > 0 or
+            FLAGS.data_aug_features_additive > 0 or
+            FLAGS.augmentation_spec_dropout_keeprate < 1 or
+            FLAGS.augmentation_freq_and_time_masking or
+            FLAGS.augmentation_pitch_and_tempo_scaling or
+            FLAGS.augmentation_speed_up_std > 0):
+        do_cache_dataset = False
+
     # Create training and validation datasets
     train_set = create_dataset(FLAGS.train_files.split(','),
                                batch_size=FLAGS.train_batch_size,
-                               cache_path=FLAGS.feature_cache,
+                               cache_path=FLAGS.feature_cache if do_cache_dataset else None,
                                train_phase=True)
 
     iterator = tfv1.data.Iterator.from_structure(tfv1.data.get_output_types(train_set),

util/feeding.py

@@ -132,10 +132,13 @@ def create_dataset(csvs, batch_size, cache_path='', train_phase=False):
 
     dataset = (tf.data.Dataset.from_generator(generate_values,
                                               output_types=(tf.string, (tf.int64, tf.int32, tf.int64)))
-                              .map(process_fn, num_parallel_calls=tf.data.experimental.AUTOTUNE)
-                              .cache(cache_path)
-                              .window(batch_size, drop_remainder=True).flat_map(batch_fn)
-                              .prefetch(num_gpus))
+                              .map(process_fn, num_parallel_calls=tf.data.experimental.AUTOTUNE))
+
+    if cache_path is not None:
+        dataset = dataset.cache(cache_path)
+
+    dataset = (dataset.window(batch_size, drop_remainder=True).flat_map(batch_fn)
+                      .prefetch(num_gpus))
 
     return dataset