import mmcv
import torch


def single_gpu_test(model, data_loader, show=False, out_dir=None):
    model.eval()
    results = []
    dataset = data_loader.dataset
    prog_bar = mmcv.ProgressBar(len(dataset))
    for i, data in enumerate(data_loader):
        with torch.no_grad():
            result = model(return_loss=False, rescale=True, **data)

        if show:
            model.module.show_results(data, result, out_dir)

        results.append(result)

        batch_size = len(data['img_metas'][0].data)
        for _ in range(batch_size):
            prog_bar.update()
    return results