Llama3 and Llama2 are ExecuTorch compatible (#34101)

Llama3_1b and Llama2_7b are ExecuTorch compatible

Co-authored-by: Guang Yang <guangyang@fb.com>

tests/models/llama/test_modeling_llama.py

@@ -23,6 +23,7 @@ from packaging import version
 from parameterized import parameterized
 
 from transformers import AutoTokenizer, LlamaConfig, StaticCache, is_torch_available, set_seed
+from transformers.generation.configuration_utils import GenerationConfig
 from transformers.testing_utils import (
     backend_empty_cache,
     require_bitsandbytes,
@@ -916,6 +917,74 @@ class LlamaIntegrationTest(unittest.TestCase):
         static_compiled_text = tokenizer.batch_decode(generated_ids, skip_special_tokens=True)
         self.assertEqual(EXPECTED_TEXT_COMPLETION, static_compiled_text)
 
+    @slow
+    @require_read_token
+    def test_export_static_cache(self):
+        if version.parse(torch.__version__) < version.parse("2.4.0"):
+            self.skipTest(reason="This test requires torch >= 2.4 to run.")
+
+        from transformers.integrations.executorch import (
+            TorchExportableModuleWithStaticCache,
+            convert_and_export_with_cache,
+        )
+
+        llama_models = {
+            "meta-llama/Llama-3.2-1B": [
+                "Simply put, the theory of relativity states that 1) the speed of light is the same for all "
+                "observers, regardless of their location, and 2) the laws of physics are the same for all observers"
+            ],
+            "meta-llama/Llama-3.2-3B": [
+                "Simply put, the theory of relativity states that 1. the speed of light is constant, and 2. "
+                "the speed of light is the fastest speed possible"
+            ],
+            "meta-llama/Llama-2-7b-hf": [
+                "Simply put, the theory of relativity states that 1) the speed of light is a constant, and 2) "
+                "the laws of physics are the same for all",
+            ],
+        }
+
+        for llama_model_ckp, EXPECTED_TEXT_COMPLETION in llama_models.items():
+            # Load tokenizer
+            tokenizer = AutoTokenizer.from_pretrained(llama_model_ckp, pad_token="</s>", padding_side="right")
+            max_generation_length = tokenizer(EXPECTED_TEXT_COMPLETION, return_tensors="pt", padding=True)[
+                "input_ids"
+            ].shape[-1]
+
+            # Load model
+            device = "cpu"
+            dtype = torch.bfloat16
+            cache_implementation = "static"
+            attn_implementation = "sdpa"
+            batch_size = 1
+            model = LlamaForCausalLM.from_pretrained(
+                llama_model_ckp,
+                device_map=device,
+                torch_dtype=dtype,
+                attn_implementation=attn_implementation,
+                generation_config=GenerationConfig(
+                    use_cache=True,
+                    cache_implementation=cache_implementation,
+                    max_length=max_generation_length,
+                    cache_config={
+                        "batch_size": batch_size,
+                        "max_cache_len": max_generation_length,
+                    },
+                ),
+            )
+
+            prompts = ["Simply put, the theory of relativity states that "]
+            prompt_tokens = tokenizer(prompts, return_tensors="pt", padding=True).to(model.device)
+            prompt_token_ids = prompt_tokens["input_ids"]
+            max_new_tokens = max_generation_length - prompt_token_ids.shape[-1]
+
+            # Static Cache + export
+            exported_program = convert_and_export_with_cache(model)
+            ep_generated_ids = TorchExportableModuleWithStaticCache.generate(
+                exported_program=exported_program, prompt_token_ids=prompt_token_ids, max_new_tokens=max_new_tokens
+            )
+            ep_generated_text = tokenizer.batch_decode(ep_generated_ids, skip_special_tokens=True)
+            self.assertEqual(EXPECTED_TEXT_COMPLETION, ep_generated_text)
+
 
 @slow
 @require_torch_accelerator