Add interleaved RoPE test for Llama4 (Maverick) (vllm-project#21478)

Signed-off-by: Yong Hoon Shin <yhshin@meta.com>
Signed-off-by: Jinzhen Lin <linjinzhen@hotmail.com>

Author: sarckk

tests/models/multimodal/generation/test_maverick.py

@@ -22,6 +22,9 @@
                           GenerationConfig)
 
 from vllm import LLM, SamplingParams
+from vllm.v1.executor.abstract import Executor
+from vllm.v1.kv_cache_interface import (ChunkedLocalAttentionSpec,
+                                        FullAttentionSpec)
 
 from ....utils import multi_gpu_test
 
@@ -69,6 +72,26 @@ def run_maverick_serving(model: str):
         raise
 
 
+def get_rope_layers_config(model_path: str) -> list[int]:
+    """
+    Get the interleaved RoPE configuration from HuggingFace config
+
+    Args:
+        model_path: Path to the local directory containing the reduced
+            Maverick model checkpoint
+
+    Returns:
+        List of 0 or 1 indicating whether each layer uses RoPE and local attn
+        0 indicates that RoPE is not used while 1 indicates that RoPE is used.
+    """
+    config_path = Path(model_path) / "config.json"
+    model_config = json.loads(config_path.read_text())
+    text_config = model_config["text_config"]
+    no_rope_layers = text_config["no_rope_layers"]
+    print(f"Found no_rope_layers: {no_rope_layers}")
+    return no_rope_layers
+
+
 def create_reduced_maverick_model(
     original_model_name:
     str = "meta-llama/Llama-4-Maverick-17B-128E-Instruct-FP8",
@@ -113,7 +136,6 @@ def create_reduced_maverick_model(
         print("Loading original model configuration...")
         original_config = AutoConfig.from_pretrained(original_model_name,
                                                      trust_remote_code=True)
-
         print("Creating reduced configuration...")
         reduced_config = create_reduced_config(original_config, text_layers,
                                                num_experts, vision_layers)
@@ -510,21 +532,32 @@ def save_weights_to_safetensors(weights: dict[str, torch.Tensor],
           f"{index_data['metadata']['total_size'] / (1024**3):.2f} GB")
 
 
-def run_reduced_model(model_path: str,
-                      should_profile: bool = False,
-                      **kwargs) -> None:
-    """Test the created reduced model with vLLM."""
-
-    print(f"\nTesting reduced model at {model_path}...")
-
-    llm = LLM(
-        model=model_path,
-        trust_remote_code=True,
-        max_model_len=512,  # Small context for testing
-        gpu_memory_utilization=0.3,  # Conservative memory usage
-        **kwargs,
+def check_attention_spec_interleaved_rope(
+    llm: LLM,
+    num_attention_layers: int,
+    num_ranks: int,
+    rope_layers: list[int],
+):
+    """Check that the attention spec is correct."""
+    assert isinstance(llm.llm_engine.model_executor, Executor)
+    kv_cache_specs_per_rank = llm.llm_engine.model_executor.get_kv_cache_specs(
     )
-
+    for rank in range(num_ranks):
+        kv_cache_specs = kv_cache_specs_per_rank[rank]
+        assert len(kv_cache_specs.keys()) == num_attention_layers
+        for i in range(num_attention_layers):
+            if rope_layers[i] == 0:
+                expected_spec = FullAttentionSpec
+            else:
+                expected_spec = ChunkedLocalAttentionSpec
+            assert isinstance(
+                kv_cache_specs[
+                    f"language_model.model.layers.{i}.self_attn.attn"],
+                expected_spec)
+
+
+def run_reduced_model(llm: LLM, should_profile: bool = False) -> None:
+    """Test the created reduced model with vLLM."""
     sampling_params = SamplingParams(temperature=0.8,
                                      top_p=0.95,
                                      max_tokens=50)
@@ -551,6 +584,7 @@ def run_reduced_model(model_path: str,
 @pytest.mark.parametrize("tp,ep", [(2, True)])
 @pytest.mark.skipif(not torch.cuda.is_available(), reason="CUDA not available")
 def test_dummy_maverick(
+    monkeypatch,
     original_model_name: str,
     text_layers: int,
     num_experts: int,
@@ -562,6 +596,10 @@ def test_dummy_maverick(
     force_recreate: bool = True,
     profile: bool = False,
 ) -> None:
+    # Disable multiprocessing allows us to access model executor from LLM engine
+    monkeypatch.setenv("VLLM_USE_V1", "1")
+    monkeypatch.setenv("VLLM_ENABLE_V1_MULTIPROCESSING", "0")
+
     model_path = create_reduced_maverick_model(
         original_model_name=original_model_name,
         output_dir=output_dir,
@@ -573,11 +611,27 @@ def test_dummy_maverick(
 
     print(f"\nReduced model created successfully at: {model_path}")
 
-    run_reduced_model(model_path=model_path,
-                      should_profile=profile,
-                      enforce_eager=enforce_eager,
-                      tensor_parallel_size=tp,
-                      enable_expert_parallel=ep)
+    rope_layers = get_rope_layers_config(model_path)
+
+    llm = LLM(
+        model=model_path,
+        trust_remote_code=True,
+        max_model_len=512,  # Small context for testing
+        gpu_memory_utilization=0.3,  # Conservative memory usage
+        enforce_eager=enforce_eager,
+        tensor_parallel_size=tp,
+        enable_expert_parallel=ep,
+    )
+
+    check_attention_spec_interleaved_rope(
+        llm,
+        text_layers,
+        tp,
+        rope_layers,
+    )
+
+    print(f"\nTesting reduced model at {model_path}...")
+    run_reduced_model(llm=llm, should_profile=profile)
 
 
 def main():