keras-team/keras · error · ValueError

Cannot serialize {instance} because it doesn't implement `ge

Error message

Cannot serialize {instance} because it doesn't implement `get_config()`.

What it means

Error "Cannot serialize {instance} because it doesn't implement `get_config()`." thrown in keras-team/keras.

Source

Thrown at keras/src/legacy/saving/serialization.py:324

            # Any object of a different type needs to be converted to string or
            # dict for serialization (e.g. custom functions, custom classes)
            try:
                serialized_item = serialize_keras_object(item)
                if isinstance(serialized_item, dict) and not isinstance(
                    item, dict
                ):
                    serialized_item["__passive_serialization__"] = True
                serialization_config[key] = serialized_item
            except ValueError:
                serialization_config[key] = item

        name = object_registration.get_registered_name(instance.__class__)
        return serialize_keras_class_and_config(
            name, serialization_config, instance
        )
    if hasattr(instance, "__name__"):
        return object_registration.get_registered_name(instance)
    raise ValueError(
        f"Cannot serialize {instance} because it doesn't implement "
        "`get_config()`."
    )


def class_and_config_for_serialized_keras_object(
    config,
    module_objects=None,
    custom_objects=None,
    printable_module_name="object",
):
    """Returns the class name and config for a serialized keras object."""

    if (
        not isinstance(config, dict)
        or "class_name" not in config
        or "config" not in config
    ):

View on GitHub (pinned to 7a34a03db6)

When it happens

Trigger: Thrown at keras/src/legacy/saving/serialization.py:324 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/db27d280042032d0. Report an issue: GitHub.