[Misc] refactor example eagle (vllm-project#16100)

Signed-off-by: reidliu41 <reid201711@gmail.com>
Co-authored-by: reidliu41 <reid201711@gmail.com>
Signed-off-by: Yang Wang <elainewy@meta.com>

Author: reidliu41

examples/offline_inference/eagle.py

@@ -7,89 +7,102 @@
 
 from vllm import LLM, SamplingParams
 
-parser = argparse.ArgumentParser()
-
-parser.add_argument(
-    "--dataset",
-    type=str,
-    default="./examples/data/gsm8k.jsonl",
-    help="downloaded from the eagle repo " \
-    "https://github.com/SafeAILab/EAGLE/blob/main/eagle/data/"
-)
-parser.add_argument("--max_num_seqs", type=int, default=8)
-parser.add_argument("--num_prompts", type=int, default=80)
-parser.add_argument("--num_spec_tokens", type=int, default=2)
-parser.add_argument("--tp", type=int, default=1)
-parser.add_argument("--draft_tp", type=int, default=1)
-parser.add_argument("--enforce_eager", action='store_true')
-parser.add_argument("--enable_chunked_prefill", action='store_true')
-parser.add_argument("--max_num_batched_tokens", type=int, default=2048)
-parser.add_argument("--temp", type=float, default=0)
-
-args = parser.parse_args()
-
-print(args)
-
-model_dir = "meta-llama/Meta-Llama-3-8B-Instruct"
-eagle_dir = "abhigoyal/EAGLE-LLaMA3-Instruct-8B-vllm"
-
-max_model_len = 2048
-
-tokenizer = AutoTokenizer.from_pretrained(model_dir)
-
-if os.path.exists(args.dataset):
-    prompts = []
-    num_prompts = args.num_prompts
-    with open(args.dataset) as f:
-        for line in f:
-            data = json.loads(line)
-            prompts.append(data["turns"][0])
-else:
-    prompts = ["The future of AI is", "The president of the United States is"]
-
-prompts = prompts[:args.num_prompts]
-num_prompts = len(prompts)
-
-prompt_ids = [
-    tokenizer.apply_chat_template([{
-        "role": "user",
-        "content": prompt
-    }],
-                                  add_generation_prompt=True)
-    for prompt in prompts
-]
-
-llm = LLM(
-    model=model_dir,
-    trust_remote_code=True,
-    tensor_parallel_size=args.tp,
-    enable_chunked_prefill=args.enable_chunked_prefill,
-    max_num_batched_tokens=args.max_num_batched_tokens,
-    enforce_eager=args.enforce_eager,
-    max_model_len=max_model_len,
-    max_num_seqs=args.max_num_seqs,
-    gpu_memory_utilization=0.8,
-    speculative_config={
-        "model": eagle_dir,
-        "num_speculative_tokens": args.num_spec_tokens,
-        "draft_tensor_parallel_size": args.draft_tp,
-        "max_model_len": max_model_len,
-    },
-    disable_log_stats=False,
-)
-
-sampling_params = SamplingParams(temperature=args.temp, max_tokens=256)
-
-outputs = llm.generate(prompt_token_ids=prompt_ids,
-                       sampling_params=sampling_params)
-
-# calculate the average number of accepted tokens per forward pass, +1 is
-# to account for the token from the target model that's always going to be
-# accepted
-acceptance_counts = [0] * (args.num_spec_tokens + 1)
-for output in outputs:
-    for step, count in enumerate(output.metrics.spec_token_acceptance_counts):
-        acceptance_counts[step] += count
-
-print(f"mean acceptance length: \
-    {sum(acceptance_counts) / acceptance_counts[0]:.2f}")
+
+def load_prompts(dataset_path, num_prompts):
+    if os.path.exists(dataset_path):
+        prompts = []
+        try:
+            with open(dataset_path) as f:
+                for line in f:
+                    data = json.loads(line)
+                    prompts.append(data["turns"][0])
+        except Exception as e:
+            print(f"Error reading dataset: {e}")
+            return []
+    else:
+        prompts = [
+            "The future of AI is", "The president of the United States is"
+        ]
+
+    return prompts[:num_prompts]
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "--dataset",
+        type=str,
+        default="./examples/data/gsm8k.jsonl",
+        help="downloaded from the eagle repo " \
+        "https://github.com/SafeAILab/EAGLE/blob/main/eagle/data/"
+    )
+    parser.add_argument("--max_num_seqs", type=int, default=8)
+    parser.add_argument("--num_prompts", type=int, default=80)
+    parser.add_argument("--num_spec_tokens", type=int, default=2)
+    parser.add_argument("--tp", type=int, default=1)
+    parser.add_argument("--draft_tp", type=int, default=1)
+    parser.add_argument("--enforce_eager", action='store_true')
+    parser.add_argument("--enable_chunked_prefill", action='store_true')
+    parser.add_argument("--max_num_batched_tokens", type=int, default=2048)
+    parser.add_argument("--temp", type=float, default=0)
+    args = parser.parse_args()
+
+    model_dir = "meta-llama/Meta-Llama-3-8B-Instruct"
+    eagle_dir = "abhigoyal/EAGLE-LLaMA3-Instruct-8B-vllm"
+
+    max_model_len = 2048
+
+    tokenizer = AutoTokenizer.from_pretrained(model_dir)
+
+    prompts = load_prompts(args.dataset, args.num_prompts)
+
+    prompt_ids = [
+        tokenizer.apply_chat_template([{
+            "role": "user",
+            "content": prompt
+        }],
+                                      add_generation_prompt=True)
+        for prompt in prompts
+    ]
+
+    llm = LLM(
+        model=model_dir,
+        trust_remote_code=True,
+        tensor_parallel_size=args.tp,
+        enable_chunked_prefill=args.enable_chunked_prefill,
+        max_num_batched_tokens=args.max_num_batched_tokens,
+        enforce_eager=args.enforce_eager,
+        max_model_len=max_model_len,
+        max_num_seqs=args.max_num_seqs,
+        gpu_memory_utilization=0.8,
+        speculative_config={
+            "model": eagle_dir,
+            "num_speculative_tokens": args.num_spec_tokens,
+            "draft_tensor_parallel_size": args.draft_tp,
+            "max_model_len": max_model_len,
+        },
+        disable_log_stats=False,
+    )
+
+    sampling_params = SamplingParams(temperature=args.temp, max_tokens=256)
+
+    outputs = llm.generate(prompt_token_ids=prompt_ids,
+                           sampling_params=sampling_params)
+
+    # calculate the average number of accepted tokens per forward pass, +1 is
+    # to account for the token from the target model that's always going to be
+    # accepted
+    acceptance_counts = [0] * (args.num_spec_tokens + 1)
+    for output in outputs:
+        for step, count in enumerate(
+                output.metrics.spec_token_acceptance_counts):
+            acceptance_counts[step] += count
+
+    print("-" * 50)
+    print(f"mean acceptance length: \
+        {sum(acceptance_counts) / acceptance_counts[0]:.2f}")
+    print("-" * 50)
+
+
+if __name__ == "__main__":
+    main()