diff --git a/engine/U-GAT-IT.py b/engine/U-GAT-IT.py
index 860905d..85cd672 100644
--- a/engine/U-GAT-IT.py
+++ b/engine/U-GAT-IT.py
@@ -6,6 +6,7 @@ from omegaconf import OmegaConf
 
 from engine.base.i2i import EngineKernel, run_kernel, TestEngineKernel
 from engine.util.build import build_model
+from engine.util.container import LossContainer
 from loss.I2I.minimal_geometry_distortion_constraint_loss import MyLoss
 from loss.gan import GANLoss
 from model.image_translation.UGATIT import RhoClipper
@@ -27,9 +28,10 @@ class UGATITEngineKernel(EngineKernel):
         gan_loss_cfg = OmegaConf.to_container(config.loss.gan)
         gan_loss_cfg.pop("weight")
         self.gan_loss = GANLoss(**gan_loss_cfg).to(idist.device())
-        self.cycle_loss = nn.L1Loss() if config.loss.cycle.level == 1 else nn.MSELoss()
-        self.id_loss = nn.L1Loss() if config.loss.id.level == 1 else nn.MSELoss()
-        self.mgc_loss = MyLoss()
+        self.cycle_loss = LossContainer(config.loss.cycle.weight,
+                                        nn.L1Loss() if config.loss.cycle.level == 1 else nn.MSELoss())
+        self.mgc_loss = LossContainer(config.loss.mgc.weight, MyLoss())
+        self.id_loss = LossContainer(config.loss.id.weight, nn.L1Loss() if config.loss.id.level == 1 else nn.MSELoss())
         self.rho_clipper = RhoClipper(0, 1)
         self.train_generator_first = False
 
@@ -77,12 +79,9 @@ class UGATITEngineKernel(EngineKernel):
         loss = dict()
         for phase in "ab":
             cycle_image = generated["images"]["a2b2a" if phase == "a" else "b2a2b"]
-            loss[f"cycle_{phase}"] = self.config.loss.cycle.weight * self.cycle_loss(cycle_image, batch[phase])
-            loss[f"id_{phase}"] = self.config.loss.id.weight * self.id_loss(batch[phase],
-                                                                            generated["images"][f"{phase}2{phase}"])
-            if self.config.loss.mgc.weight > 0:
-                loss[f"mgc_{phase}"] = self.config.loss.mgc.weight * self.mgc_loss(
-                    batch[phase], generated["images"]["a2b" if phase == "a" else "b2a"])
+            loss[f"cycle_{phase}"] = self.cycle_loss(cycle_image, batch[phase])
+            loss[f"id_{phase}"] = self.id_loss(batch[phase], generated["images"][f"{phase}2{phase}"])
+            loss[f"mgc_{phase}"] = self.mgc_loss(batch[phase], generated["images"]["a2b" if phase == "a" else "b2a"])
             for dk in "lg":
                 generated_image = generated["images"]["a2b" if phase == "b" else "b2a"]
                 pred_fake, cam_pred = self.discriminators[dk + phase](generated_image)
diff --git a/engine/base/i2i.py b/engine/base/i2i.py
index 74822e6..d9af31f 100644
--- a/engine/base/i2i.py
+++ b/engine/base/i2i.py
@@ -100,6 +100,13 @@ class EngineKernel(object):
         pass
 
 
+def _remove_no_grad_loss(loss_dict):
+    for k in loss_dict:
+        if not isinstance(loss_dict[k], torch.Tensor):
+            loss_dict.pop(k)
+    return loss_dict
+
+
 def get_trainer(config, kernel: EngineKernel):
     logger = logging.getLogger(config.name)
     generators, discriminators = kernel.generators, kernel.discriminators
@@ -147,10 +154,10 @@ def get_trainer(config, kernel: EngineKernel):
 
         if engine.state.iteration % iteration_per_image == 0:
             return {
-                "loss": dict(g=loss_g, d=loss_d),
+                "loss": dict(g=_remove_no_grad_loss(loss_g), d=_remove_no_grad_loss(loss_d)),
                 "img": kernel.intermediate_images(batch, generated)
             }
-        return {"loss": dict(g=loss_g, d=loss_d)}
+        return {"loss": dict(g=_remove_no_grad_loss(loss_g), d=_remove_no_grad_loss(loss_d))}
 
     trainer = Engine(_step)
     trainer.logger = logger
diff --git a/engine/util/container.py b/engine/util/container.py
new file mode 100644
index 0000000..c1690fd
--- /dev/null
+++ b/engine/util/container.py
@@ -0,0 +1,9 @@
+class LossContainer:
+    def __init__(self, weight, loss):
+        self.weight = weight
+        self.loss = loss
+
+    def __call__(self, *args, **kwargs):
+        if self.weight > 0:
+            return self.weight * self.loss(*args, **kwargs)
+        return 0.0