message: Fixed error where no background audio samples were being used when testing no-speech clips
diff: @@ -457,7 +457,7 @@ class AudioProcessor(object):
  self.time_shift_offset_placeholder_: time_shift_offset,
  }
  # Choose a section of background noise to mix in.
  - if use_background:
  + if use_background or sample['label'] == SILENCE_LABEL:
  background_index = np.random.randint(len(self.background_data))
  background_samples = self.background_data[background_index]
  background_offset = np.random.randint(
  @@ -465,7 +465,9 @@ class AudioProcessor(object):
  background_clipped = background_samples[background_offset:(
  background_offset + desired_samples)]
  background_reshaped = background_clipped.reshape([desired_samples, 1])
  - if np.random.uniform(0, 1) < background_frequency:
  + if sample['label'] == SILENCE_LABEL:
  + background_volume = np.random.uniform(0, 1)
  + elif np.random.uniform(0, 1) < background_frequency:
  background_volume = np.random.uniform(0, background_volume_range)
  else:
  background_volume = 0
  