keras-team/keras · error · ValueError

Unknown `floatx` value: {value}. Expected one of {accepted_d

Error message

Unknown `floatx` value: {value}. Expected one of {accepted_dtypes}

What it means

Error "Unknown `floatx` value: {value}. Expected one of {accepted_dtypes}" thrown in keras-team/keras.

Source

Thrown at keras/src/backend/config.py:78

    Examples:
    >>> keras.config.floatx()
    'float32'

    >>> keras.config.set_floatx('float64')
    >>> keras.config.floatx()
    'float64'

    >>> # Set it back to float32
    >>> keras.config.set_floatx('float32')

    Raises:
        ValueError: In case of invalid value.
    """
    global _FLOATX
    accepted_dtypes = {"bfloat16", "float16", "float32", "float64"}
    if value not in accepted_dtypes:
        raise ValueError(
            f"Unknown `floatx` value: {value}. "
            f"Expected one of {accepted_dtypes}"
        )
    _FLOATX = str(value)


@keras_export(["keras.config.epsilon", "keras.backend.epsilon"])
def epsilon():
    """Return the value of the fuzz factor used in numeric expressions.

    Returns:
        A float.

    Example:

    >>> keras.config.epsilon()
    1e-07

View on GitHub (pinned to 7a34a03db6)

When it happens

Trigger: Thrown at keras/src/backend/config.py:78 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/731a38c79a9c5488. Report an issue: GitHub.