keras-team/keras · error · ValueError

Invalid value for argument `output_mode`. Expected one of {'

Error message

Invalid value for argument `output_mode`. Expected one of {'int', 'one_hot'}. Received: output_mode={output_mode}

What it means

Error "Invalid value for argument `output_mode`. Expected one of {'int', 'one_hot'}. Received: output_mode={output_mode}" thrown in keras-team/keras.

Source

Thrown at keras/src/layers/preprocessing/feature_space.py:21

from keras.src import backend
from keras.src import layers
from keras.src import tree
from keras.src.api_export import keras_export
from keras.src.layers.layer import Layer
from keras.src.layers.preprocessing.data_layer import DataLayer
from keras.src.saving import saving_lib
from keras.src.saving import serialization_lib
from keras.src.saving.keras_saveable import KerasSaveable
from keras.src.utils import backend_utils
from keras.src.utils.module_utils import tensorflow as tf
from keras.src.utils.naming import auto_name
from keras.src.utils.progbar import Progbar


class Cross(KerasSaveable):
    def __init__(self, feature_names, crossing_dim, output_mode="one_hot"):
        if output_mode not in {"int", "one_hot"}:
            raise ValueError(
                "Invalid value for argument `output_mode`. "
                "Expected one of {'int', 'one_hot'}. "
                f"Received: output_mode={output_mode}"
            )
        self.feature_names = tuple(feature_names)
        self.crossing_dim = crossing_dim
        self.output_mode = output_mode

    def _obj_type(self):
        return "Cross"

    @property
    def name(self):
        return "_X_".join(self.feature_names)

    def get_config(self):
        return {
            "feature_names": self.feature_names,

View on GitHub (pinned to 7a34a03db6)

When it happens

Trigger: Thrown at keras/src/layers/preprocessing/feature_space.py:21 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/fa747ff8df91cd46. Report an issue: GitHub.