keras-team/keras · error · ValueError

Cannot interpret `dtype` argument. Expected a string or an i

Error message

Cannot interpret `dtype` argument. Expected a string or an instance of DTypePolicy. Received: dtype={identifier}

What it means

Error "Cannot interpret `dtype` argument. Expected a string or an instance of DTypePolicy. Received: dtype={identifier}" thrown in keras-team/keras.

Source

Thrown at keras/src/dtype_policies/__init__.py:112

    from keras.src.dtype_policies.dtype_policy import (
        _get_quantized_dtype_policy_by_str,
    )

    if identifier is None:
        return dtype_policy.dtype_policy()
    if isinstance(identifier, DTypePolicy):
        return identifier
    if isinstance(identifier, dict):
        return deserialize(identifier)
    if isinstance(identifier, str):
        if identifier.startswith(QUANTIZATION_MODES):
            return _get_quantized_dtype_policy_by_str(identifier)
        else:
            return DTypePolicy(identifier)
    try:
        return DTypePolicy(backend.standardize_dtype(identifier))
    except:
        raise ValueError(
            "Cannot interpret `dtype` argument. Expected a string "
            f"or an instance of DTypePolicy. Received: dtype={identifier}"
        )

View on GitHub (pinned to 7a34a03db6)

When it happens

Trigger: Thrown at keras/src/dtype_policies/__init__.py:112 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/c789d4fe0c35f79b. Report an issue: GitHub.