keras-team/keras · error · ValueError

Invalid images rank: expected rank 3 (single image) or rank

Error message

Invalid images rank: expected rank 3 (single image) or rank 4 (batch of images). Received input with shape: images.shape={images.shape}

What it means

Error "Invalid images rank: expected rank 3 (single image) or rank 4 (batch of images). Received input with shape: images.shape={images.shape}" thrown in keras-team/keras.

Source

Thrown at keras/src/backend/openvino/image.py:57

    "nearest": "nearest",
    "bicubic": "cubic",
}
# Lanczos methods are handled via _ov_scale_and_translate
# instead of ov_opset.interpolate, which does not support them natively.
LANCZOS_INTERPOLATIONS = {
    "lanczos3": "lanczos3",
    "lanczos5": "lanczos5",
}
ALL_RESIZE_INTERPOLATIONS = tuple(RESIZE_INTERPOLATIONS) + tuple(
    LANCZOS_INTERPOLATIONS
)


def rgb_to_grayscale(images, data_format=None):
    images = get_ov_output(images)
    data_format = backend.standardize_data_format(data_format)
    if images.get_partial_shape().rank not in (3, 4):
        raise ValueError(
            "Invalid images rank: expected rank 3 (single image) "
            "or rank 4 (batch of images). Received input with shape: "
            f"images.shape={images.shape}"
        )
    channel_axis = -3 if data_format == "channels_first" else -1
    if images.shape[channel_axis] not in (1, 3):
        raise ValueError(
            "Invalid channel size: expected 3 (RGB) or 1 (Grayscale). "
            f"Received input with shape: images.shape={images.shape}"
        )

    if images.shape[channel_axis] == 3:
        original_type = images.get_element_type()
        rgb_weights = ov_opset.constant(
            [0.2989, 0.5870, 0.1140], dtype=original_type
        ).output(0)
        if data_format == "channels_first":
            rgb_weights = ov_opset.unsqueeze(rgb_weights, axes=[-2, -1]).output(

View on GitHub (pinned to 7a34a03db6)

When it happens

Trigger: Thrown at keras/src/backend/openvino/image.py:57 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/b375d9f105bdf151. Report an issue: GitHub.