[MISC] set default model to qwen in example (#87)

- Set default model to Qwen2.5-0.5B-Instruct in example
- Remove Ultravox 0.3 because it is not tested currently

Signed-off-by: MengqingCao <cmq0113@163.com>

examples/offline_distributed_inference_npu.py

@@ -30,9 +30,9 @@ prompts = [
 sampling_params = SamplingParams(max_tokens=100, temperature=0.0)
 # Create an LLM.
 llm = LLM(
-    model="facebook/opt-125m",
+    model="Qwen/Qwen2.5-0.5B-Instruct",
     tensor_parallel_size=2,
-    distributed_executor_backend="ray",
+    distributed_executor_backend="mp",
     trust_remote_code=True,
 )