16 bit gray scale Image read error

Describe the question.

My loader is configured as follows.

However, KeyError: <DALIDataType.UINT16: 1> is occurring.

torch 1.12.1+cu113
nvidia-dali-cuda110 1.36.0
I'm using the above version

class ExternalInputIterator(object):
    ....
  def __next__(self):
      source_batch = []
      target_batch = []
      name_batch = []

      if self.i >= self.n:
          self.__iter__()
          raise StopIteration

      for _ in range(self.batch_size):
          filename = self.source_files[self.i % self.n]
          # print("self.i : ", self.i, ", filename : ", filename)

          source_batch.append(np.fromfile(os.path.join(self.source_root, filename), dtype=np.uint8))  # we can use numpy
          target_batch.append(np.fromfile(os.path.join(self.target_root, filename), dtype=np.uint8))  # we can use numpy
          # name_batch.append(filename)
          name_batch.append(np.fromstring(filename, dtype=np.uint8))
          self.i += 1

      return (source_batch, target_batch, name_batch)

  def __len__(self):
      return self.data_set_len

  next = __next__


def ExternalSourcePipeline(batch_size, num_threads, device_id, external_data, mode):
  pipe = Pipeline(batch_size, num_threads, device_id)
  with pipe:
      source_img, target_img, filename = fn.external_source(source=external_data, num_outputs=3)

      source_images = fn.experimental.decoders.image(
          source_img, device='mixed', output_type=types.GRAY, dtype=types.UINT16)
      target_images = fn.experimental.decoders.image(
          source_img, device='mixed', output_type=types.GRAY, dtype=types.UINT16)

      ...
      ...

      pipe.set_outputs(source_images, target_images, filename)
  return pipe

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