[CI/Build][BugFix][The Rock][AMD] Add spawn method in vision examples to avoid reinitialization (#47932)

Signed-off-by: Randall Smith <Randall.Smith@amd.com>
Co-authored-by: Andreas Karatzas <akaratza@amd.com>

Author: rasmith

examples/generate/multimodal/vision_language_multi_image_offline.py

@@ -17,6 +17,7 @@
 from vllm import LLM, EngineArgs, SamplingParams
 from vllm.lora.request import LoRARequest
 from vllm.multimodal.utils import fetch_image
+from vllm.platforms import current_platform
 from vllm.utils.argparse_utils import FlexibleArgumentParser
 
 QUESTION = "What is the content of each image?"
@@ -1443,6 +1444,8 @@ def run_generate(
     engine_args.seed = seed
     if tensor_parallel_size is not None:
         engine_args.tensor_parallel_size = tensor_parallel_size
+    if current_platform.is_rocm():
+        os.environ["VLLM_WORKER_MULTIPROC_METHOD"] = "spawn"
     llm = LLM.from_engine_args(engine_args)
 
     sampling_params = SamplingParams(
@@ -1484,6 +1487,8 @@ def run_chat(
     engine_args.seed = seed
     if tensor_parallel_size is not None:
         engine_args.tensor_parallel_size = tensor_parallel_size
+    if current_platform.is_rocm():
+        os.environ["VLLM_WORKER_MULTIPROC_METHOD"] = "spawn"
     llm = LLM.from_engine_args(engine_args)
 
     sampling_params = (

examples/generate/multimodal/vision_language_offline.py

@@ -21,6 +21,7 @@
 from vllm.assets.video import VideoAsset
 from vllm.lora.request import LoRARequest
 from vllm.multimodal.image import convert_image_mode
+from vllm.platforms import current_platform
 from vllm.utils.argparse_utils import FlexibleArgumentParser
 
 
@@ -2646,6 +2647,8 @@ def main(args):
     if args.tensor_parallel_size is not None:
         engine_args.tensor_parallel_size = args.tensor_parallel_size
     engine_args = maybe_add_vit_cuda_graph_compilation_config(args, engine_args)
+    if current_platform.is_rocm():
+        os.environ["VLLM_WORKER_MULTIPROC_METHOD"] = "spawn"
     llm = LLM.from_engine_args(engine_args)
 
     # Don't want to check the flag multiple times, so just hijack `prompts`.