@Override
    protected OrderedTensorType lazyGetType() {
        if ( ! allInputTypesPresent(1)) return null;
        return inputs.get(0).type().get();
    }
Convert imported 'softmax' operation to the Vespa softmax ranking function.

@author lesters
model-integration/src/main/java/ai/vespa/rankingexpression/importer/operations/Softmax.java