keras-team/keras · error · ValueError

Cannot pass None at locations {none_args} with signature={si

Error message

Cannot pass None at locations {none_args} with signature={signature}

What it means

Error "Cannot pass None at locations {none_args} with signature={signature}" thrown in keras-team/keras.

Source

Thrown at keras/src/backend/common/backend_utils.py:624

    @functools.wraps(pyfunc)
    def wrapped(*args, **kwargs):
        excluded_func, args, kwargs = _vectorize_apply_excluded(
            pyfunc, excluded, args, kwargs
        )

        if signature is not None:
            input_core_dims, output_core_dims = (
                _vectorize_parse_gufunc_signature(signature)
            )
        else:
            input_core_dims = [()] * len(args)
            output_core_dims = None

        none_args = {i for i, arg in enumerate(args) if arg is None}
        if any(none_args):
            if any(input_core_dims[i] != () for i in none_args):
                raise ValueError(
                    f"Cannot pass None at locations {none_args} "
                    f"with signature={signature}"
                )
            excluded_func, args, _ = _vectorize_apply_excluded(
                excluded_func, none_args, args, {}
            )
            input_core_dims = [
                dim
                for i, dim in enumerate(input_core_dims)
                if i not in none_args
            ]

        args = tuple(map(ops.convert_to_tensor, args))

        broadcast_shape, dim_sizes = _vectorize_parse_input_dimensions(
            args, input_core_dims
        )
        checked_func = _vectorize_check_output_dims(

View on GitHub (pinned to 7a34a03db6)

When it happens

Trigger: Thrown at keras/src/backend/common/backend_utils.py:624 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/21667705c6f7b619. Report an issue: GitHub.