benchmark json schema (#2030)

benchmark/json_schema/README.md

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+## Run benchmark
+
+### Benchmark sglang
+
+Run Llama-8b
+
+```bash
+python3 -m sglang.launch_server --model-path meta-llama/Llama-3.1-8B-Instruct --port 30000
+```
+
+Benchmark
+
+```bash
+python3 bench_sglang.py
+```

benchmark/json_schema/bench_sglang.py

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+import argparse
+import json
+import time
+from typing import List, Tuple
+
+import jsonschema
+from datasets import load_dataset
+
+import sglang as sgl
+from sglang.test.test_utils import (
+    add_common_sglang_args_and_parse,
+    select_sglang_backend,
+)
+from sglang.utils import dump_state_text
+
+
+@sgl.function
+def schema_gen(s, message: Tuple[str, str], json_schema: str):
+    system, user = message
+    s += sgl.system(system)
+    s += sgl.user(user)
+    s += sgl.assistant(
+        sgl.gen("json_output", temperature=0, max_tokens=256, json_schema=json_schema)
+    )
+
+
+def contains_formats(schema, formats: List[str]):
+    if isinstance(schema, dict):
+        if schema.get("format", None) in formats:
+            return True
+        for value in schema.values():
+            if contains_formats(value, formats):
+                return True
+    elif isinstance(schema, list):
+        for item in schema:
+            if contains_formats(item, formats):
+                return True
+    return False
+
+
+def convert_dataset(path: str):
+    raw_dataset = load_dataset(path)
+    dataset = []
+    for data in raw_dataset["train"]:
+        messages = data["prompt"]
+        schema = data["schema"]
+        obj = json.loads(schema)
+
+        # skip some corrupted examples
+        if obj.get("type", None) is None:
+            continue
+
+        # skip schema with format "email"
+        # which is not supported by outlines for now
+        if contains_formats(obj, ["email"]):
+            continue
+
+        system = messages[0]
+        user = messages[1]
+        assert system["role"] == "system", "invalid role"
+        assert user["role"] == "user", "invalid role"
+        assert len(messages) == 2, "invalid message length"
+        message = json.dumps(system["content"]), json.dumps(user["content"])
+        dataset.append(
+            {
+                "message": message,
+                "json_schema": schema,
+            }
+        )
+
+    return dataset
+
+
+def bench_schema(args):
+    arguments = convert_dataset(args.data_path)
+
+    if args.num_jsons < 0 or args.num_jsons > len(arguments):
+        args.num_jsons = len(arguments)
+    arguments = arguments[: args.num_jsons]
+
+    # Select backend
+    backend = select_sglang_backend(args)
+    sgl.set_default_backend(backend)
+
+    # Run requests
+    tic = time.time()
+    states = schema_gen.run_batch(
+        arguments,
+        temperature=0,
+        num_threads=args.parallel,
+        progress_bar=True,
+    )
+    latency = time.time() - tic
+
+    # Check if the outputs are valid
+    indexs = []
+    for i, state in enumerate(states):
+        try:
+            schema = json.loads(arguments[i]["json_schema"])
+            obj = json.loads(state["json_output"])
+            assert jsonschema.validate(obj, schema) is None
+        except Exception as e:
+            print(e)
+            indexs.append(i)
+
+    assert len(indexs) == 0, f"Invalid json outputs: {indexs}"
+    return states, latency
+
+
+def main(args):
+    states, latency = bench_schema(args)
+
+    # Compute accuracy
+    print(f"Latency: {latency:.3f}")
+
+    # Write results
+    dump_state_text(f"tmp_output_{args.backend}.txt", states)
+    with open(f"{args.backend}.json", "w") as fout:
+        for state in states:
+            fout.write(state["json_output"] + "\n")
+
+    with open(args.result_file, "a") as fout:
+        value = {
+            "task": "json_schema",
+            "backend": args.backend,
+            "latency": round(latency, 3),
+            "num_jsons": args.num_jsons,
+            "parallel": args.parallel,
+        }
+        fout.write(json.dumps(value) + "\n")
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--data-path", type=str, default="NousResearch/json-mode-eval")
+    parser.add_argument("--num-jsons", type=int, default=-1)
+    args = add_common_sglang_args_and_parse(parser)
+    main(args)