keras-team/keras · error · ValueError

Only `None` and `softmax` activations are allowed for the `c

Error message

Only `None` and `softmax` activations are allowed for the `classifier_activation` argument when using pretrained weights, with `include_top=True`; Received: classifier_activation={classifier_activation}

What it means

Error "Only `None` and `softmax` activations are allowed for the `classifier_activation` argument when using pretrained weights, with `include_top=True`; Received: classifier_activation={classifier_activation}" thrown in keras-team/keras.

Source

Thrown at keras/src/applications/imagenet_utils.py:460

    """validates that the classifer_activation is compatible with the weights.

    Args:
      classifier_activation: str or callable activation function
      weights: The pretrained weights to load.

    Raises:
      ValueError: if an activation other than `None` or `softmax` are used with
        pretrained weights.
    """
    if weights is None:
        return

    classifier_activation = activations.get(classifier_activation)
    if classifier_activation not in {
        activations.get("softmax"),
        activations.get(None),
    }:
        raise ValueError(
            "Only `None` and `softmax` activations are allowed "
            "for the `classifier_activation` argument when using "
            "pretrained weights, with `include_top=True`; Received: "
            f"classifier_activation={classifier_activation}"
        )

View on GitHub (pinned to 7a34a03db6)

When it happens

Trigger: Thrown at keras/src/applications/imagenet_utils.py:460 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/316ac21b9935c631. Report an issue: GitHub.