def evaluate_model(trained_model, data_loader):
net = CrowdCounter()
network.load_net(trained_model, net)
net.cuda()
net.eval()
mae = 0.0
mse = 0.0
for blob in data_loader:
im_data = blob['data']
gt_data = blob['gt_density']
density_map = net.forward(im_data, gt_data)
density_map = density_map.data.cpu().numpy()
gt_count = np.sum(gt_data)
et_count = np.sum(density_map)
mae += abs(gt_count - et_count)
mse += ((gt_count - et_count) * (gt_count - et_count))
mae = mae / data_loader.get_num_samples()
mse = np.sqrt(mse / data_loader.get_num_samples())
return mae, mse
re_cnt = False
t = Timer()
t.tic()
data_loader = ImageDataLoader(train_path, train_gt_path, shuffle=True, gt_downsample=True, pre_load=True)
data_loader_val = ImageDataLoader(val_path, val_gt_path, shuffle=False, gt_downsample=True, pre_load=True)
best_mae = sys.maxsize
for epoch in range(start_step, end_step+1):
step = -1
train_loss = 0
for blob in data_loader:
step = step + 1
im_data = blob['data']
gt_data = blob['gt_density']
density_map = net.forward(im_data, gt_data)
loss = net.loss
train_loss += loss.item()
step_cnt += 1
optimizer.zero_grad()
loss.backward()
optimizer.step()
if step % disp_interval == 0:
duration = t.toc(average=False)
fps = step_cnt / duration
gt_count = np.sum(gt_data)
density_map = density_map.data.cpu().numpy()
et_count = np.sum(density_map)
utils.save_results(im_data,gt_data,density_map, output_dir)
log_text = 'epoch: %4d, step %4d, Time: %.4fs, gt_cnt: %4.1f, et_cnt: %4.1f' % (epoch,