def efficientnet_params(model_name):
    """Map EfficientNet model name to parameter coefficients."""
    params_dict = {
        # (widthi_coefficient, depth_coefficient, image_size, dropout_rate)
        'efficientnet_lite0': (1.0, 1.0, 224, 0.2),
        'efficientnet_lite1': (1.0, 1.1, 240, 0.2),
        'efficientnet_lite2': (1.1, 1.2, 260, 0.3),
        'efficientnet_lite3': (1.2, 1.4, 280, 0.3),
        'efficientnet_lite4': (1.4, 1.8, 300, 0.3),
    }
    return params_dict[model_name]