keras-team/keras · error · TypeError

Invalid `output_size` argument. Expected a tuple or list. Re

Error message

Invalid `output_size` argument. Expected a tuple or list. Received: output_size={output_size} of type {type(output_size).__name__}

What it means

Error "Invalid `output_size` argument. Expected a tuple or list. Received: output_size={output_size} of type {type(output_size).__name__}" thrown in keras-team/keras.

Source

Thrown at keras/src/ops/image.py:1135

    >>> recon = keras.ops.image.reconstruct_patches(
    ...     patches, size=(3, 3, 3), output_size=(9, 9, 9)
    ... )
    >>> recon.shape
    (2, 9, 9, 9, 3)
    """
    if not isinstance(size, int):
        if not isinstance(size, (tuple, list)):
            raise TypeError(
                "Invalid `size` argument. Expected an int or a tuple. "
                f"Received: size={size} of type {type(size).__name__}"
            )
        if len(size) not in (2, 3):
            raise ValueError(
                "Invalid `size` argument. Expected a tuple of length 2 or 3. "
                f"Received: size={size} with length {len(size)}"
            )
    if not isinstance(output_size, (tuple, list)):
        raise TypeError(
            "Invalid `output_size` argument. Expected a tuple or list. "
            f"Received: output_size={output_size} of type "
            f"{type(output_size).__name__}"
        )

    if any_symbolic_tensors((patches,)):
        return ReconstructPatches(
            size=size,
            output_size=output_size,
            strides=strides,
            padding=padding,
            data_format=data_format,
        ).symbolic_call(patches)

    return _reconstruct_patches(
        patches,
        size,
        output_size,

View on GitHub (pinned to 7a34a03db6)

When it happens

Trigger: Thrown at keras/src/ops/image.py:1135 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of keras-team/keras@7a34a03db6 (2026-08-25). Data as JSON: /api/errors/3603fcfba906ec5c. Report an issue: GitHub.