[Examples][1/n] Resettle basic examples. (#35579)

Signed-off-by: wang.yuqi <yuqi.wang@daocloud.io>
Signed-off-by: wang.yuqi <noooop@126.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
Co-authored-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

examples/basic/offline_inference/classify.py

@@ -0,0 +1,52 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+
+from argparse import Namespace
+
+from vllm import LLM, EngineArgs
+from vllm.utils.argparse_utils import FlexibleArgumentParser
+
+
+def parse_args():
+    parser = FlexibleArgumentParser()
+    parser = EngineArgs.add_cli_args(parser)
+    # Set example specific arguments
+    parser.set_defaults(
+        model="jason9693/Qwen2.5-1.5B-apeach",
+        runner="pooling",
+        enforce_eager=True,
+    )
+    return parser.parse_args()
+
+
+def main(args: Namespace):
+    # Sample prompts.
+    prompts = [
+        "Hello, my name is",
+        "The president of the United States is",
+        "The capital of France is",
+        "The future of AI is",
+    ]
+
+    # Create an LLM.
+    # You should pass runner="pooling" for classification models
+    llm = LLM(**vars(args))
+
+    # Generate logits. The output is a list of ClassificationRequestOutputs.
+    outputs = llm.classify(prompts)
+
+    # Print the outputs.
+    print("\nGenerated Outputs:\n" + "-" * 60)
+    for prompt, output in zip(prompts, outputs):
+        probs = output.outputs.probs
+        probs_trimmed = (str(probs[:16])[:-1] + ", ...]") if len(probs) > 16 else probs
+        print(
+            f"Prompt: {prompt!r} \n"
+            f"Class Probabilities: {probs_trimmed} (size={len(probs)})"
+        )
+        print("-" * 60)
+
+
+if __name__ == "__main__":
+    args = parse_args()
+    main(args)