keras-team/keras · error · ValueError

Invalid value for argument `interpolation`. Expected of one

Error message

Invalid value for argument `interpolation`. Expected of one {AFFINE_TRANSFORM_INTERPOLATIONS}. Received: interpolation={interpolation}

What it means

Error "Invalid value for argument `interpolation`. Expected of one {AFFINE_TRANSFORM_INTERPOLATIONS}. Received: interpolation={interpolation}" thrown in keras-team/keras.

Source

Thrown at keras/src/backend/numpy/image.py:671

    if need_squeeze:
        affined = np.squeeze(affined, axis=0)
    return affined.astype(input_dtype)


def perspective_transform(
    images,
    start_points,
    end_points,
    interpolation="bilinear",
    fill_value=0,
    data_format=None,
):
    data_format = backend.standardize_data_format(data_format)
    start_points = convert_to_tensor(start_points)
    end_points = convert_to_tensor(end_points)

    if interpolation not in AFFINE_TRANSFORM_INTERPOLATIONS:
        raise ValueError(
            "Invalid value for argument `interpolation`. Expected of one "
            f"{AFFINE_TRANSFORM_INTERPOLATIONS}. Received: "
            f"interpolation={interpolation}"
        )

    if len(images.shape) 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}"
        )

    if start_points.ndim not in (2, 3) or start_points.shape[-2:] != (4, 2):
        raise ValueError(
            "Invalid start_points shape: expected (4,2) for a single image"
            f" or (N,4,2) for a batch. Received shape: {start_points.shape}"
        )
    if end_points.ndim not in (2, 3) or end_points.shape[-2:] != (4, 2):

View on GitHub (pinned to 7a34a03db6)

When it happens

Trigger: Thrown at keras/src/backend/numpy/image.py:671 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/774531a7bd7f5a4c. Report an issue: GitHub.