keras-team/keras · error · ValueError

`unroll` must be an positive integer or boolean. Received: u

Error message

`unroll` must be an positive integer or boolean. Received: unroll={unroll}

What it means

Error "`unroll` must be an positive integer or boolean. Received: unroll={unroll}" thrown in keras-team/keras.

Source

Thrown at keras/src/backend/jax/core.py:561

        return tree.map_structure(convert_jax_spec_to_keras_tensor, jax_out)


def cond(pred, true_fn, false_fn):
    return jax.lax.cond(pred, true_fun=true_fn, false_fun=false_fn)


def vectorized_map(function, elements):
    return jax.vmap(function)(elements)


def map(f, xs):
    return jax.lax.map(f, xs)


def scan(f, init, xs=None, length=None, reverse=False, unroll=1):
    if not isinstance(unroll, bool):
        if not isinstance(unroll, int) or unroll < 1:
            raise ValueError(
                "`unroll` must be an positive integer or boolean. "
                f"Received: unroll={unroll}"
            )
    return jax.lax.scan(
        f, init=init, xs=xs, length=length, reverse=reverse, unroll=unroll
    )


def associative_scan(f, elems, reverse=False, axis=0):
    return jax.lax.associative_scan(f, elems, reverse, axis)


def scatter(indices, values, shape):
    zeros = jnp.zeros(shape, values.dtype)
    key = tuple(jnp.moveaxis(indices, -1, 0))
    return zeros.at[key].add(values)

View on GitHub (pinned to 7a34a03db6)

When it happens

Trigger: Thrown at keras/src/backend/jax/core.py:561 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/3815ec6debdafa1e. Report an issue: GitHub.