chore: import upstream snapshot with attribution

examples/infer/demo.py

@@ -0,0 +1,57 @@
+# Copyright (c) ModelScope Contributors. All rights reserved.
+import os
+from typing import List
+
+os.environ['CUDA_VISIBLE_DEVICES'] = '0'
+
+
+def infer_batch(engine: 'InferEngine', infer_requests: List['InferRequest']):
+    request_config = RequestConfig(max_tokens=512, temperature=0)
+    metric = InferStats()
+    resp_list = engine.infer(infer_requests, request_config, metrics=[metric])
+    query0 = infer_requests[0].messages[0]['content']
+    print(f'query0: {query0}')
+    print(f'response0: {resp_list[0].choices[0].message.content}')
+    print(f'metric: {metric.compute()}')
+    # metric.reset()  # reuse
+
+
+def infer_stream(engine: 'InferEngine', infer_request: 'InferRequest'):
+    request_config = RequestConfig(max_tokens=512, temperature=0, stream=True)
+    metric = InferStats()
+    gen_list = engine.infer([infer_request], request_config, metrics=[metric])
+    query = infer_request.messages[0]['content']
+    print(f'query: {query}\nresponse: ', end='')
+    for resp in gen_list[0]:
+        if resp is None:
+            continue
+        print(resp.choices[0].delta.content, end='', flush=True)
+    print()
+    print(f'metric: {metric.compute()}')
+
+
+if __name__ == '__main__':
+    from swift import InferEngine, InferRequest, InferStats, RequestConfig, TransformersEngine, load_dataset
+    model = 'Qwen/Qwen2.5-1.5B-Instruct'
+    infer_backend = 'transformers'
+
+    if infer_backend == 'transformers':
+        engine = TransformersEngine(model, max_batch_size=64)
+    elif infer_backend == 'vllm':
+        from swift.infer_engine import VllmEngine
+        engine = VllmEngine(model, max_model_len=8192)
+    elif infer_backend == 'sglang':
+        from swift.infer_engine import SglangEngine
+        engine = SglangEngine(model)
+    elif infer_backend == 'lmdeploy':
+        from swift.infer_engine import LmdeployEngine
+        engine = LmdeployEngine(model)
+
+    # Here, `load_dataset` is used for convenience; `infer_batch` does not require creating a dataset.
+    dataset = load_dataset(['AI-ModelScope/alpaca-gpt4-data-zh#1000'], seed=42)[0]
+    print(f'dataset: {dataset}')
+    infer_requests = [InferRequest(**data) for data in dataset]
+    infer_batch(engine, infer_requests)
+
+    messages = [{'role': 'user', 'content': 'who are you?'}]
+    infer_stream(engine, InferRequest(messages=messages))