tensorflow/models · error · ValueError

Unknown layer - {}

Error message

Unknown layer - {}

What it means

Error "Unknown layer - {}" thrown in tensorflow/models.

Source

Thrown at official/projects/deepmac_maskrcnn/modeling/heads/hourglass_network.py:490

  def num_feature_outputs(self):
    """Ther number of feature outputs returned by the feature extractor."""
    return self.num_hourglasses


def _layer_depth(layer):
  """Compute depth of Conv/Residual blocks or lists of them."""

  if isinstance(layer, list):
    return sum([_layer_depth(l) for l in layer])

  elif isinstance(layer, ConvolutionalBlock):
    return 1

  elif isinstance(layer, ResidualBlock):
    return 2

  else:
    raise ValueError('Unknown layer - {}'.format(layer))


def _encoder_decoder_depth(network):
  """Helper function to compute depth of encoder-decoder blocks."""

  encoder_block2_layers = _layer_depth(network.encoder_block2)
  decoder_block_layers = _layer_depth(network.decoder_block)

  if isinstance(network.inner_block[0], EncoderDecoderBlock):

    assert len(network.inner_block) == 1, 'Inner block is expected as length 1.'
    inner_block_layers = _encoder_decoder_depth(network.inner_block[0])

    return inner_block_layers + encoder_block2_layers + decoder_block_layers

  elif isinstance(network.inner_block[0], ResidualBlock):
    return (encoder_block2_layers + decoder_block_layers +
            _layer_depth(network.inner_block))

View on GitHub (pinned to e006f5f0d5)

When it happens

Trigger: Thrown at official/projects/deepmac_maskrcnn/modeling/heads/hourglass_network.py:490 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of tensorflow/models@e006f5f0d5 (2026-08-24). Data as JSON: /api/errors/30b280348f68c303. Report an issue: GitHub.