keras-team/keras · error · ValueError

Expected input to have rank >= 1. Received scalar input {a}.

Error message

Expected input to have rank >= 1. Received scalar input {a}.

What it means

Error "Expected input to have rank >= 1. Received scalar input {a}." thrown in keras-team/keras.

Source

Thrown at keras/src/ops/linalg.py:841

        A tensor of shape `(..., N, M)` containing the pseudoinverse
        of each matrix in `x`.

    Example:

    >>> a = keras.ops.convert_to_tensor([[1., 2.], [3., 4.], [5., 6.]])
    >>> keras.ops.pinv(a) @ a
    array([[1., 0.],
           [0., 1.]], dtype=float32)
    """
    if any_symbolic_tensors((x,)):
        return Pinv(rcond=rcond).symbolic_call(x)
    return backend.linalg.pinv(x, rcond=rcond)


def _assert_1d(*arrays):
    for a in arrays:
        if a.ndim < 1:
            raise ValueError(
                f"Expected input to have rank >= 1. Received scalar input {a}."
            )


def _assert_2d(*arrays):
    for a in arrays:
        if a.ndim < 2:
            raise ValueError(
                "Expected input to have rank >= 2. "
                f"Received input with shape {a.shape}."
            )


def _assert_square(*arrays):
    for a in arrays:
        m, n = a.shape[-2:]
        if m != n:
            raise ValueError(

View on GitHub (pinned to 7a34a03db6)

When it happens

Trigger: Thrown at keras/src/ops/linalg.py:841 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/640a08ce07ed8f05. Report an issue: GitHub.