[Bench] Add bench for MMLU eval

Usage:
```
python python/bench/eval/mmlu.py --model dist/Meta-Llama-3-8B-Instruct-q4f16_1-MLC --dataset /path/to/dataset --device cuda --log-dir debug/mmlu
```

Note that chat mode is problematic, which needs to be fixed.

python/mlc_llm/bench/evaluation/mmlu.py

@@ -0,0 +1,245 @@
+"""Eval MMLU with MLCEngine."""
+
+import argparse
+import asyncio
+import csv
+import json
+import string
+from datetime import datetime
+from pathlib import Path
+from typing import Any, Dict, List, Optional
+
+import numpy as np
+import tqdm
+
+from mlc_llm import AsyncMLCEngine
+
+SUBJECTS = [
+    "abstract_algebra",
+    "anatomy",
+    "astronomy",
+    "business_ethics",
+    "clinical_knowledge",
+    "college_biology",
+    "college_chemistry",
+    "college_computer_science",
+    "college_mathematics",
+    "college_medicine",
+    "college_physics",
+    "computer_security",
+    "conceptual_physics",
+    "econometrics",
+    "electrical_engineering",
+    "elementary_mathematics",
+    "formal_logic",
+    "global_facts",
+    "high_school_biology",
+    "high_school_chemistry",
+    "high_school_computer_science",
+    "high_school_european_history",
+    "high_school_geography",
+    "high_school_government_and_politics",
+    "high_school_macroeconomics",
+    "high_school_mathematics",
+    "high_school_microeconomics",
+    "high_school_physics",
+    "high_school_psychology",
+    "high_school_statistics",
+    "high_school_us_history",
+    "high_school_world_history",
+    "human_aging",
+    "human_sexuality",
+    "international_law",
+    "jurisprudence",
+    "logical_fallacies",
+    "machine_learning",
+    "management",
+    "marketing",
+    "medical_genetics",
+    "miscellaneous",
+    "moral_disputes",
+    "moral_scenarios",
+    "nutrition",
+    "philosophy",
+    "prehistory",
+    "professional_accounting",
+    "professional_law",
+    "professional_medicine",
+    "professional_psychology",
+    "public_relations",
+    "security_studies",
+    "sociology",
+    "us_foreign_policy",
+    "virology",
+    "world_religions",
+]
+PADDING_LEN = max(len(subject) for subject in SUBJECTS)
+DEVICES = ["cuda", "rocm", "metal", "vulkan"]
+PROMPT_TEMPLATE = string.Template("$Q\nA. $A\nB. $B\nC. $C\nD. $D\nAnswer:")
+
+
+def parse_args():
+    """Parse command line arguments."""
+
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--model", type=str, required=True)
+    parser.add_argument(
+        "--dataset", type=Path, required=True, help="Path to MMLU test dataset home."
+    )
+    parser.add_argument("--device", type=str, choices=["auto"] + DEVICES, default="auto")
+    parser.add_argument("--model-lib", type=str, default=None)
+    parser.add_argument("-s", "--subject", nargs="+", type=str, choices=SUBJECTS, default=SUBJECTS)
+    parser.add_argument("-bs", "--batch-size", type=int, default=16)
+    parser.add_argument("--log-dir", type=Path, default=None)
+    return parser.parse_args()
+
+
+async def send_request(
+    async_engine: AsyncMLCEngine,
+    prompts: List[str],
+    semaphore: asyncio.Semaphore,
+    subject: str,
+):
+    """Send the calibration requests to the engine."""
+    tasks = []
+
+    async def generate_task(prompt):
+        async with semaphore:
+            return await async_engine.completions.create(
+                prompt=prompt,
+                stream=False,
+                max_tokens=1,
+                temperature=1.0,
+                logprobs=True,
+                top_logprobs=5,
+            )
+
+    for prompt in prompts:
+        task = asyncio.create_task(generate_task(prompt))
+        tasks.append(task)
+
+    return await tqdm.asyncio.tqdm.gather(
+        *tasks,
+        desc=f"Running {subject.ljust(PADDING_LEN)}",
+        bar_format="{desc} {percentage:3.0f}%|{bar}{r_bar}",
+    )
+
+
+async def evaluate(  # pylint: disable=too-many-arguments, too-many-locals
+    model: str,
+    device: str,
+    dataset: Path,
+    model_lib: Optional[str],
+    subjects: List[str],
+    semaphore: asyncio.Semaphore,
+    log_dir: Optional[Path],  # pylint: disable=redefined-outer-name
+):
+    """Evaluate MMLU for the model."""
+    async_engine = AsyncMLCEngine(model, device=device, model_lib=model_lib, mode="server")
+
+    results: Dict[str, Any] = {}
+    for subject in subjects:
+        with open(dataset / "test" / f"{subject}_test.csv", encoding="utf-8") as csvfile:
+            tests = list(csv.reader(csvfile, delimiter=",", quotechar='"'))
+            assert all(len(test) == 6 for test in tests)
+
+        logs = []
+        num_correct = 0
+        prompts = [
+            PROMPT_TEMPLATE.substitute(Q=test[0], A=test[1], B=test[2], C=test[3], D=test[4])
+            for test in tests
+        ]
+        responses = await send_request(async_engine, prompts, semaphore, subject)
+
+        assert len(responses) == len(tests)
+        for response, test in zip(responses, tests):
+            token_logprobs = {}
+            logprobs = response.choices[0].logprobs.content[0].top_logprobs
+            for logprob in logprobs:
+                if logprob.token not in token_logprobs:
+                    token_logprobs[logprob.token] = logprob.logprob
+
+            abcd_logprobs = {}
+            for choice in ["A", "B", "C", "D"]:
+                abcd_logprobs[choice] = token_logprobs[choice] if choice in token_logprobs else -100
+
+            pred = {0: "A", 1: "B", 2: "C", 3: "D"}[int(np.argmax(list(abcd_logprobs.values())))]
+            num_correct += pred == test[5]
+
+            logs.append(
+                {
+                    "Question": {
+                        "Q": test[0],
+                        "A": test[1],
+                        "B": test[2],
+                        "C": test[3],
+                        "D": test[4],
+                    },
+                    "Answer": test[5],
+                    "Response": {
+                        "pred": pred,
+                        "logprobs": list(abcd_logprobs.values()),
+                    },
+                }
+            )
+
+        results[subject] = {
+            "correct": num_correct,
+            "total": len(tests),
+            "accuracy": num_correct / len(tests),
+        }
+
+        if log_dir:
+            with open(log_dir / "subjects" / f"{subject}.json", "w", encoding="utf-8") as f:
+                json.dump(logs, f, indent=2)
+
+    total_correct, total_tests = 0, 0
+    for subject, v in results.items():
+        num_correct, num_tests, accuracy = v["correct"], v["total"], v["accuracy"]
+        print(f"{subject}: {num_correct} / {num_tests} = {accuracy * 100:.2f}%")
+        total_correct += num_correct
+        total_tests += num_tests
+
+    total_accuracy = total_correct / total_tests
+    results["total"] = {
+        "correct": total_correct,
+        "total": total_tests,
+        "accuracy": total_accuracy,
+    }
+    print(f"Total accuracy: {total_correct} / {total_tests} = {total_accuracy * 100:.2f}%")
+
+    if log_dir:
+        results = {
+            "config": {
+                "model": model,
+                "device": device,
+                "model_lib": model_lib,
+                "subjects": subjects,
+            },
+            "results": results,
+        }
+        with open(log_dir / "summary.json", "w", encoding="utf-8") as f:
+            json.dump(results, f, indent=2)
+
+
+if __name__ == "__main__":
+    args = parse_args()
+    start_time = datetime.now()
+    log_dir: Optional[Path] = None
+    if args.log_dir is not None:
+        time_dir = start_time.strftime("%Y-%m-%d_%H-%M-%S")
+        log_dir = args.log_dir / time_dir
+        (log_dir / "subjects").mkdir(parents=True, exist_ok=True)
+    asyncio.run(
+        evaluate(
+            model=args.model,
+            device=args.device,
+            dataset=args.dataset,
+            model_lib=args.model_lib,
+            subjects=args.subject,
+            semaphore=asyncio.Semaphore(args.batch_size),
+            log_dir=log_dir,
+        )
+    )
+    end_time = datetime.now()
+    print(f"Time used: {end_time - start_time}")