keras-team/keras · error · ValueError

Invalid `size` argument. Expected a tuple of length 2 or 3.

Error message

Invalid `size` argument. Expected a tuple of length 2 or 3. Received: size={size} with length {len(size)}

What it means

Error "Invalid `size` argument. Expected a tuple of length 2 or 3. Received: size={size} with length {len(size)}" thrown in keras-team/keras.

Source

Thrown at keras/src/ops/image.py:734

    >>> patches = keras.ops.image.extract_patches(volumes, (3, 3, 3))
    >>> patches.shape
    (2, 3, 3, 3, 81)

    >>> # 3D patches from single volume
    >>> volume = np.random.random((10, 10, 10, 3)).astype("float32")
    >>> patches = keras.ops.image.extract_patches(volume, (3, 3, 3))
    >>> patches.shape
    (3, 3, 3, 81)
    """
    # Validate size argument
    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)}"
            )

    # 2D patch extraction (default)
    if any_symbolic_tensors((images,)):
        return ExtractPatches(
            size=size,
            strides=strides,
            dilation_rate=dilation_rate,
            padding=padding,
            data_format=data_format,
        ).symbolic_call(images)

    return _extract_patches(
        images, size, strides, dilation_rate, padding, data_format=data_format
    )

View on GitHub (pinned to 7a34a03db6)

When it happens

Trigger: Thrown at keras/src/ops/image.py:734 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/ce5751ce15d7935f. Report an issue: GitHub.