keras/src/layers/preprocessing/hashed_crossing.py/HashedCrossing/_check_at_least_two_inputs
class HashedCrossing:    def _check_at_least_two_inputs(self, inputs):
        if not isinstance(inputs, (list, tuple)):
            raise ValueError(
                "`HashedCrossing` should be called on a list or tuple of "
                f"inputs. Received: inputs={inputs}"
            )
        if len(inputs) < 2:
            raise ValueError(
                "`HashedCrossing` should be called on at least two inputs. "
                f"Received: inputs={inputs}"
            )