Update train.py test batch_size (#2148)

* Update train.py

* Update loss.py

train.py

@@ -190,7 +190,7 @@ def train(hyp, opt, device, tb_writer=None, wandb=None):
     # Process 0
     if rank in [-1, 0]:
         ema.updates = start_epoch * nb // accumulate  # set EMA updates
-        testloader = create_dataloader(test_path, imgsz_test, total_batch_size, gs, opt,  # testloader
+        testloader = create_dataloader(test_path, imgsz_test, batch_size * 2, gs, opt,  # testloader
                                        hyp=hyp, cache=opt.cache_images and not opt.notest, rect=True, rank=-1,
                                        world_size=opt.world_size, workers=opt.workers,
                                        pad=0.5, prefix=colorstr('val: '))[0]
@@ -338,7 +338,7 @@ def train(hyp, opt, device, tb_writer=None, wandb=None):
             final_epoch = epoch + 1 == epochs
             if not opt.notest or final_epoch:  # Calculate mAP
                 results, maps, times = test.test(opt.data,
-                                                 batch_size=total_batch_size,
+                                                 batch_size=batch_size * 2,
                                                  imgsz=imgsz_test,
                                                  model=ema.ema,
                                                  single_cls=opt.single_cls,

utils/loss.py

@@ -105,8 +105,7 @@ class ComputeLoss:
             BCEcls, BCEobj = FocalLoss(BCEcls, g), FocalLoss(BCEobj, g)
 
         det = model.module.model[-1] if is_parallel(model) else model.model[-1]  # Detect() module
-        self.balance = {3: [3.67, 1.0, 0.43], 4: [3.78, 1.0, 0.39, 0.22], 5: [3.88, 1.0, 0.37, 0.17, 0.10]}[det.nl]
-        # self.balance = [1.0] * det.nl
+        self.balance = {3: [3.67, 1.0, 0.43], 4: [4.0, 1.0, 0.25, 0.06], 5: [4.0, 1.0, 0.25, 0.06, .02]}[det.nl]
         self.ssi = (det.stride == 16).nonzero(as_tuple=False).item()  # stride 16 index
         self.BCEcls, self.BCEobj, self.gr, self.hyp, self.autobalance = BCEcls, BCEobj, model.gr, h, autobalance
         for k in 'na', 'nc', 'nl', 'anchors':