def eval_model(model, test, add_eval_metrics={}):
    """Evaluate model's performance on the test-set.

    # Arguments
        model: Keras model
        test: test-dataset. Tuple of inputs `x` and target `y` - `(x, y)`.
        add_eval_metrics: Additional evaluation metrics to use. Can be a dictionary or a list of functions
    accepting arguments: `y_true`, `y_predicted`. Alternatively, you can provide names of functions from
    the `concise.eval_metrics` module.

    # Returns
        dictionary with evaluation metrics

    """
    # evaluate the model
    logger.info("Evaluate...")
    # - model_metrics
    model_metrics_values = model.evaluate(test[0], test[1], verbose=0,
                                          batch_size=test[1].shape[0])
    # evaluation is done in a single pass to have more precise metics
    model_metrics = dict(zip(_listify(model.metrics_names),
                             _listify(model_metrics_values)))
    # - eval_metrics
    y_true = test[1]
    y_pred = model.predict(test[0], verbose=0)
    eval_metrics = {k: v(y_true, y_pred) for k, v in add_eval_metrics.items()}

    # handle the case where the two metrics names intersect
    # - omit duplicates from eval_metrics
    intersected_keys = set(model_metrics).intersection(set(eval_metrics))
    if len(intersected_keys) > 0:
        logger.warning("Some metric names intersect: {0}. Ignoring the add_eval_metrics ones".
                       format(intersected_keys))
        eval_metrics = _delete_keys(eval_metrics, intersected_keys)

    return merge_dicts(model_metrics, eval_metrics)
Evaluate model's performance on the test-set.

    # Arguments
        model: Keras model
        test: test-dataset. Tuple of inputs `x` and target `y` - `(x, y)`.
        add_eval_metrics: Additional evaluation metrics to use. Can be a dictionary or a list of functions
    accepting arguments: `y_true`, `y_predicted`. Alternatively, you can provide names of functions from
    the `concise.eval_metrics` module.

    # Returns
        dictionary with evaluation metrics