hpcaitech/Open-Sora · error · ValueError

block_type {block_type} is not supported for upsampling

Error message

block_type {block_type} is not supported for upsampling

What it means

build_upsample_block only supports 'ConvPixelShuffle' and 'InterpolateConv' as upsample block types; any other string raises this ValueError when the decoder is constructed.

Source

Thrown at opensora/models/dc_ae/models/dc_ae.py:240

    temporal_upsample: bool = False,
) -> nn.Module:
    if block_type == "ConvPixelShuffle":
        if is_video:
            raise NotImplementedError("ConvPixelShuffle upsample is not supported for video")
        block = ConvPixelShuffleUpSampleLayer(
            in_channels=in_channels, out_channels=out_channels, kernel_size=3, factor=2
        )
    elif block_type == "InterpolateConv":
        block = InterpolateConvUpSampleLayer(
            in_channels=in_channels,
            out_channels=out_channels,
            kernel_size=3,
            factor=2,
            is_video=is_video,
            temporal_upsample=temporal_upsample,
        )
    else:
        raise ValueError(f"block_type {block_type} is not supported for upsampling")
    if shortcut is None:
        pass
    elif shortcut == "duplicating":
        shortcut_block = ChannelDuplicatingPixelShuffleUpSampleLayer(
            in_channels=in_channels, out_channels=out_channels, factor=2, temporal_upsample=temporal_upsample
        )
        block = ResidualBlock(block, shortcut_block)
    else:
        raise ValueError(f"shortcut {shortcut} is not supported for upsample")
    return block


def build_encoder_project_in_block(
    in_channels: int, out_channels: int, factor: int, downsample_block_type: str, is_video: bool
):
    if factor == 1:
        block = ConvLayer(
            in_channels=in_channels,

View on GitHub (pinned to 7ad6a96a13)

Solutions

  1. Correct upsample_block_type to 'ConvPixelShuffle' (images) or 'InterpolateConv' (video)
  2. Start from a shipped config matching your model variant
  3. Align opensora version with the config source

Example fix

# before
upsample_block_type: pixelshuffle
# after
upsample_block_type: ConvPixelShuffle
Defensive patterns

Strategy: validation

Validate before calling

SUPPORTED_UP = {'ConvPixelShuffle', 'InterpolateConv'}
assert cfg['upsample_block_type'] in SUPPORTED_UP, cfg['upsample_block_type']

Prevention

When it happens

Trigger: Passing an unknown upsample_block_type (e.g. 'NearestConv', 'PixelShuffle', a typo) from the DCAE config into the decoder build path.

Common situations: Hand-written or ported configs; version skew between config files and the supported block list in this version of opensora.

Understand the failure class

Background: "Invalid value" and "allowed values are" config errors: what your library rejected and how to fix it — this error's family across 41 libraries.

Related errors

AI-assisted analysis of hpcaitech/Open-Sora@7ad6a96a13 (2026-08-28). Data as JSON: /api/errors/08c0fae21eb837c9. Report an issue: GitHub.