keras-team/keras · error · ValueError

median only supports single axis reduction

Error message

median only supports single axis reduction

What it means

Error "median only supports single axis reduction" thrown in keras-team/keras.

Source

Thrown at keras/src/backend/openvino/numpy.py:3009

    x_shape = x.get_partial_shape()
    rank = x_shape.rank.get_length()

    if rank == 0:
        return OpenVINOKerasTensor(x)

    # Handle axis=None by flattening the input
    flattened_all = False
    if axis is None:
        x = ov_opset.reshape(x, [-1], False).output(0)
        axis = 0
        original_rank = rank
        rank = 1
        flattened_all = True
    else:
        # Handle tuple axis - for median, we only support single axis
        if isinstance(axis, (tuple, list)):
            if len(axis) != 1:
                raise ValueError("median only supports single axis reduction")
            axis = axis[0]

        # Handle negative axis
        if axis < 0:
            axis = rank + axis
        original_rank = rank

    # Get the size of the dimension to sort
    shape_tensor = ov_opset.shape_of(x, output_type=Type.i32).output(0)
    k = ov_opset.gather(
        shape_tensor,
        ov_opset.constant([axis], Type.i32).output(0),
        ov_opset.constant(0, Type.i32).output(0),
    ).output(0)

    # Convert k to a scalar value
    k_scalar = ov_opset.squeeze(k, [0]).output(0)

View on GitHub (pinned to 7a34a03db6)

When it happens

Trigger: Thrown at keras/src/backend/openvino/numpy.py:3009 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/2013b94413655865. Report an issue: GitHub.