hotfix: those tests fail locally on mac due to buffer count

Author: geohot

Diff for: test/models/test_train.py

@@ -40,6 +40,7 @@ def test_convnext(self):
     check_gc()
 
   @unittest.skipIf(CI, "slow")
+  @unittest.skipIf(Device.DEFAULT in ["METAL", "WEBGPU"], "too many buffers for webgpu and metal")
   def test_efficientnet(self):
     model = EfficientNet(0)
     X = np.zeros((BS,3,224,224), dtype=np.float32)
@@ -56,6 +57,7 @@ def test_vit(self):
     train_one_step(model,X,Y)
     check_gc()
 
+  @unittest.skipIf(Device.DEFAULT in ["METAL", "WEBGPU"], "too many buffers for webgpu and metal")
   def test_transformer(self):
     # this should be small GPT-2, but the param count is wrong
     # (real ff_dim is 768*4)