Fix 3 failing slow bart/blender tests (#7652)

tests/test_modeling_blenderbot.py

@@ -134,38 +134,31 @@ class BlenderbotTesterMixin(ModelTesterMixin, unittest.TestCase):
 class Blenderbot3BIntegrationTests(unittest.TestCase):
     ckpt = "facebook/blenderbot-3B"
 
-    @cached_property
-    def model(self):
-        model = BlenderbotForConditionalGeneration.from_pretrained(self.ckpt).to(torch_device)
-        if torch_device == "cuda":
-            model = model.half()
-        return model
-
     @cached_property
     def tokenizer(self):
         return BlenderbotTokenizer.from_pretrained(self.ckpt)
 
     @slow
     def test_generation_from_short_input_same_as_parlai_3B(self):
+        torch.cuda.empty_cache()
+        model = BlenderbotForConditionalGeneration.from_pretrained(self.ckpt).half().to(torch_device)
 
         src_text = ["Sam"]
         model_inputs = self.tokenizer(src_text, return_tensors="pt").to(torch_device)
-        generated_utterances = self.model.generate(**model_inputs, **FASTER_GEN_KWARGS)
+        generated_utterances = model.generate(**model_inputs, **FASTER_GEN_KWARGS)
         tgt_text = 'Sam is a great name. It means "sun" in Gaelic.'
 
         generated_txt = self.tokenizer.batch_decode(generated_utterances, **TOK_DECODE_KW)
         assert generated_txt[0].strip() == tgt_text
 
-    @slow
-    def test_generation_from_long_input_same_as_parlai_3B(self):
-
         src_text = "Social anxiety\nWow, I am never shy. Do you have anxiety?\nYes. I end up sweating and blushing and feel like i'm going to throw up.\nand why is that?"
 
         model_inputs = self.tokenizer([src_text], return_tensors="pt").to(torch_device)
-        generated_ids = self.model.generate(**model_inputs, **FASTER_GEN_KWARGS)[0]
+        generated_ids = model.generate(**model_inputs, **FASTER_GEN_KWARGS)[0]
         reply = self.tokenizer.decode(generated_ids, **TOK_DECODE_KW)
 
         assert "I think it's because we are so worried about what people think of us." == reply.strip()
+        del model
 
 
 @require_torch
@@ -193,7 +186,6 @@ class Blenderbot90MIntegrationTests(unittest.TestCase):
 
         model_inputs = self.tokenizer(src_text, return_tensors="pt").to(torch_device)
         assert isinstance(self.tokenizer, BlenderbotSmallTokenizer)
-        assert self.model.config.do
         generated_ids = self.model.generate(**model_inputs)[0]
         reply = self.tokenizer.decode(generated_ids, **TOK_DECODE_KW)