[Delivery] Update model delivery script (#2565)

Some improvements of the delivery script:

- provide different overrides for different quantization. e.g. we can change
prefill chunk size for q0/q3/q4
- rerun gen config only if only conv_template changes
- do NOT recreate HF repo when the repo already exists. This will preserve
commit history
- dry-run validation

python/mlc_llm/cli/delivery.py

@@ -30,6 +30,18 @@
 T = TypeVar("T", bound="BaseModel")
 
 
+class OverrideConfigs(BaseModel):
+    """
+    The class that specifies the override configurations.
+    """
+
+    context_window_size: Optional[int] = None
+    sliding_window_size: Optional[int] = None
+    prefill_chunk_size: Optional[int] = None
+    attention_sink_size: Optional[int] = None
+    tensor_parallel_shards: Optional[int] = None
+
+
 class ModelDeliveryTask(BaseModel):
     """
     Example:
@@ -38,21 +50,21 @@ class ModelDeliveryTask(BaseModel):
         "model": "HF://microsoft/Phi-3-mini-128k-instruct",
         "conv_template": "phi-3",
         "quantization": ["q3f16_1"],
-        "context_window_size": 4096
+        "overrides": {
+            "q3f16_1": {
+                "context_window_size": 512
+            }
+        }
     }
     """
 
     model_id: str
     model: str
     conv_template: str
-    quantization: Optional[Union[List[str], str]] = Field(default_factory=list)
+    quantization: Union[List[str], str] = Field(default_factory=list)
+    overrides: Dict[str, OverrideConfigs] = Field(default_factory=dict)
     destination: Optional[str] = None
-
-    context_window_size: Optional[int] = None
-    sliding_window_size: Optional[int] = None
-    prefill_chunk_size: Optional[int] = None
-    attention_sink_size: Optional[int] = None
-    tensor_parallel_shards: Optional[int] = None
+    gen_config_only: Optional[bool] = False
 
 
 class ModelDeliveryList(BaseModel):
@@ -63,7 +75,8 @@ class ModelDeliveryList(BaseModel):
     tasks: List[ModelDeliveryTask]
     # For delivered log, the default destination and quantization fields are optional
     default_destination: Optional[str] = None
-    default_quantization: Optional[List[str]] = None
+    default_quantization: List[str] = Field(default_factory=list)
+    default_overrides: Dict[str, OverrideConfigs] = Field(default_factory=dict)
 
     @classmethod
     def from_json(cls: Type[T], json_dict: Dict[str, Any]) -> T:
@@ -115,10 +128,7 @@ def _run_quantization(
     except HfHubHTTPError as error:
         if error.response.status_code != 409:
             raise
-        logger.info("[HF] Repo already exists. Recreating...")
-        api.delete_repo(repo_id=repo)
-        api.create_repo(repo_id=repo, private=False)
-        logger.info("[HF] Repo recreated")
+        logger.info("[HF] Repo already exists. Skipping creation.")
     succeeded = True
     log_path = Path(output_dir) / "logs.txt"
     with log_path.open("a", encoding="utf-8") as log_file:
@@ -147,21 +157,24 @@ def _run_quantization(
 
         print(" ".join(cmd), file=log_file, flush=True)
         subprocess.run(cmd, check=True, stdout=log_file, stderr=subprocess.STDOUT, env=os.environ)
-        cmd = [
-            sys.executable,
-            "-m",
-            "mlc_llm",
-            "convert_weight",
-            str(model_info.model),
-            "--quantization",
-            model_info.quantization,
-            "--output",
-            output_dir,
-        ]
-        print(" ".join(cmd), file=log_file, flush=True)
-        subprocess.run(cmd, check=False, stdout=log_file, stderr=subprocess.STDOUT, env=os.environ)
+        if not model_info.gen_config_only:
+            cmd = [
+                sys.executable,
+                "-m",
+                "mlc_llm",
+                "convert_weight",
+                str(model_info.model),
+                "--quantization",
+                model_info.quantization,
+                "--output",
+                output_dir,
+            ]
+            print(" ".join(cmd), file=log_file, flush=True)
+            subprocess.run(
+                cmd, check=False, stdout=log_file, stderr=subprocess.STDOUT, env=os.environ
+            )
         logger.info("[MLC] Complete!")
-    if not (Path(output_dir) / "ndarray-cache.json").exists():
+    if not (Path(output_dir) / "ndarray-cache.json").exists() and not model_info.gen_config_only:
         logger.error(
             "[%s] Model %s. Quantization %s. No weights metadata found.",
             red("FAILED"),
@@ -175,7 +188,7 @@ def _run_quantization(
             api.upload_folder(
                 folder_path=output_dir,
                 repo_id=repo,
-                commit_message="Initial commit",
+                ignore_patterns=["logs.txt"],
             )
         except Exception as exc:  # pylint: disable=broad-except
             logger.error("[%s] %s. Retrying...", red("FAILED"), exc)
@@ -198,38 +211,99 @@ def _get_current_log(log: str) -> ModelDeliveryList:
     return current_log
 
 
+def _generate_model_delivery_diff(  # pylint: disable=too-many-locals
+    spec: ModelDeliveryList, log: ModelDeliveryList
+) -> ModelDeliveryList:
+    diff_tasks = []
+    default_quantization = spec.default_quantization
+    default_overrides = spec.default_overrides
+
+    for task in spec.tasks:
+        model_id = task.model_id
+        conv_template = task.conv_template
+        quantization = task.quantization
+        overrides = {**default_overrides, **task.overrides}
+
+        logger.info("Checking task: %s %s %s %s", model_id, conv_template, quantization, overrides)
+        log_tasks = [t for t in log.tasks if t.model_id == model_id]
+        delivered_quantizations = set()
+        gen_config_only = set()
+
+        for log_task in log_tasks:
+            log_quantization = log_task.quantization
+            assert isinstance(log_quantization, str)
+            log_override = log_task.overrides.get(log_quantization, OverrideConfigs())
+            override = overrides.get(log_quantization, OverrideConfigs())
+            if log_override == override:
+                if log_task.conv_template == conv_template:
+                    delivered_quantizations.add(log_quantization)
+                else:
+                    gen_config_only.add(log_quantization)
+
+        all_quantizations = set(default_quantization) | set(quantization)
+        quantization_diff = all_quantizations - set(delivered_quantizations)
+
+        if quantization_diff:
+            for q in quantization_diff:
+                logger.info("Adding task %s %s %s to the diff.", model_id, conv_template, q)
+                task_copy = task.model_copy()
+                task_copy.quantization = [q]
+                task_copy.overrides = {q: overrides.get(q, OverrideConfigs())}
+                task_copy.gen_config_only = task_copy.gen_config_only or q in gen_config_only
+                diff_tasks.append(task_copy)
+        else:
+            logger.info("Task %s %s %s is up-to-date.", model_id, conv_template, quantization)
+
+    diff_config = spec.model_copy()
+    diff_config.default_quantization = []
+    diff_config.default_overrides = {}
+    diff_config.tasks = diff_tasks
+
+    logger.info("Model delivery diff: %s", diff_config.model_dump_json(indent=4, exclude_none=True))
+
+    return diff_config
+
+
 def _main(  # pylint: disable=too-many-locals, too-many-arguments
     username: str,
     api: HfApi,
     spec: ModelDeliveryList,
     log: str,
     hf_local_dir: Optional[str],
     output: str,
+    dry_run: bool,
 ):
+    delivery_diff = _generate_model_delivery_diff(spec, _get_current_log(log))
+    if dry_run:
+        logger.info("Dry run. No actual delivery.")
+        return
+
     failed_cases: List[Tuple[str, str]] = []
     delivered_log = _get_current_log(log)
-    for task_index, task in enumerate(spec.tasks, 1):
+    for task_index, task in enumerate(delivery_diff.tasks, 1):
         logger.info(
             bold("[{task_index}/{total_tasks}] Processing model: ").format(
                 task_index=task_index,
-                total_tasks=len(spec.tasks),
+                total_tasks=len(delivery_diff.tasks),
             )
             + green(task.model_id)
         )
         model = _clone_repo(task.model, hf_local_dir)
 
         quantizations = []
 
-        if spec.default_quantization:
-            quantizations += spec.default_quantization
+        if delivery_diff.default_quantization:
+            quantizations += delivery_diff.default_quantization
 
         if task.quantization:
             if isinstance(task.quantization, str):
                 quantizations.append(task.quantization)
             else:
                 quantizations += task.quantization
 
-        default_destination = spec.default_destination or "{username}/{model_id}-{quantization}-MLC"
+        default_destination = (
+            delivery_diff.default_destination or "{username}/{model_id}-{quantization}-MLC"
+        )
         for quantization in quantizations:
             repo = default_destination.format(
                 username=username,
@@ -260,12 +334,19 @@ def _main(  # pylint: disable=too-many-locals, too-many-arguments
                     (task.model_id, quantization),
                 )
             else:
+                delivered_log.tasks = [
+                    task
+                    for task in delivered_log.tasks
+                    if task.model_id != model_info.model_id
+                    or task.quantization != model_info.quantization
+                ]
                 delivered_log.tasks.append(model_info)
     if failed_cases:
         logger.info("Total %s %s:", len(failed_cases), red("failures"))
         for model_id, quantization in failed_cases:
             logger.info("  Model %s. Quantization %s.", model_id, quantization)
 
+    delivered_log.tasks.sort(key=lambda task: task.model_id)
     logger.info("Writing log to %s", log)
     with open(log, "w", encoding="utf-8") as o_f:
         json.dump(delivered_log.to_json(), o_f, indent=4)
@@ -336,6 +417,11 @@ def _get_default_hf_token() -> str:
         required=False,
         help="Local directory to store the downloaded HuggingFace model",
     )
+    parser.add_argument(
+        "--dry-run",
+        action="store_true",
+        help="Dry run without uploading to HuggingFace Hub",
+    )
     parsed = parser.parse_args()
     _main(
         parsed.username,
@@ -344,6 +430,7 @@ def _get_default_hf_token() -> str:
         api=HfApi(token=parsed.token),
         hf_local_dir=parsed.hf_local_dir,
         output=parsed.output,
+        dry_run=parsed.dry_run,
     )