[diffusion] feat: support loading serialized comfy convrot int8 native encoders (#36023)

docs/docs/sglang-diffusion/quantization.mdx

@@ -169,10 +169,10 @@ backend.
     <tr>
       <td><code>comfy-int8-convrot</code></td>
       <td>One selected safetensors file with per-layer <code>int8_tensorwise</code> and ConvRot metadata</td>
-      <td><code>--transformer-weights-path</code></td>
+      <td><code>--transformer-weights-path</code>, or an explicit weight file through <code>--component-paths.&lt;component&gt;</code></td>
-      <td>MiniMax-H3 native DiT; pruned FL2VA is E2E-verified and Ref2VA has the same validated tensor contract</td>
+      <td>Native DiTs and encoders whose parameter mappings preserve each marked linear; MiniMax-H3 DiT and Qwen3-VL encoder checkpoints have validated tensor contracts</td>
       <td><code>comfy-kitchen</code></td>
-      <td>CUDA; auto-detected; uses the fused Kitchen INT8 kernel and validates weight/scale layout before model construction. TP requires every row-parallel input shard to preserve the checkpoint's ConvRot group boundary; the H3 256-group checkpoint supports TP1/2/4, not TP8. Offload is supported; FSDP is not.</td>
+      <td>CUDA; auto-detected; uses the fused Kitchen INT8 kernel and validates weight/scale layout before model construction. TP requires every row-parallel input shard to preserve the checkpoint's ConvRot group boundary. The H3 256-group DiT supports TP1/2/4, not TP8; its Qwen3-VL encoder keeps TP8 by replicating only incompatible row projections. Offload is supported; FSDP is not.</td>
     </tr>
     <tr>
       <td><code>qvg-kv</code></td>
@@ -345,9 +345,10 @@ sglang generate \
 
 ### Kitchen INT8
 
-Serialized Comfy ConvRot INT8 DiTs are selected through
+Serialized Comfy ConvRot INT8 DiTs use `--transformer-weights-path`; compatible
-`--transformer-weights-path` and auto-detected from their per-layer markers.
+native encoders use an explicit file through `--component-paths.<component>` or
-They load INT8 weights and row scales directly; omit `--quantization`.
+its component alias. Both are auto-detected from per-layer markers and load
+INT8 weights and row scales directly; omit `--quantization`.
 
 For a BF16 checkpoint, `--quantization kitchen_int8` instead performs online
 quantization after loading:

python/sglang/multimodal_gen/runtime/layers/quantization/comfy_fp8.py

@@ -93,6 +93,7 @@ class ComfyFp8Config(QuantizationConfig):
     def __init__(self, layer_markers: dict[str, dict[str, Any]]) -> None:
         super().__init__()
         self.layer_markers = layer_markers
+        self.selected: list[str] = []
         self._fp8_config = Fp8Config(
             is_checkpoint_fp8_serialized=True,
             activation_scheme="static",
@@ -136,6 +137,7 @@ class ComfyFp8Config(QuantizationConfig):
         marker = self.layer_markers.get(prefix)
         if marker is None:
             return UnquantizedLinearMethod()
+        self.selected.append(prefix)
         if marker.get("full_precision_matrix_mult", False):
             return ComfyFullPrecisionFp8LinearMethod()
         return Fp8LinearMethod(self._fp8_config)

python/sglang/multimodal_gen/runtime/layers/quantization/configs/base_config.py

@@ -154,3 +154,9 @@ class QuantizationConfig(ABC):
 
     def get_cache_scale(self, name: str) -> str | None:
         return None
+
+    def supports_input_partition(
+        self, prefix: str, input_size_per_partition: int
+    ) -> bool:
+        """Whether a row-parallel shard preserves this format's input layout."""
+        return True

python/sglang/multimodal_gen/runtime/layers/quantization/configs/kitchen_int8_config.py

@@ -155,3 +155,14 @@ class KitchenInt8Config(QuantizationConfig):
 
     def get_scaled_act_names(self) -> list[str]:
         return []
+
+    def supports_input_partition(
+        self, prefix: str, input_size_per_partition: int
+    ) -> bool:
+        group_size = self.group_size
+        if self.layer_markers is not None:
+            marker_group_size = self._serialized_group_sizes.get(prefix)
+            if marker_group_size is None:
+                return True
+            group_size = marker_group_size
+        return input_size_per_partition % group_size == 0

python/sglang/multimodal_gen/runtime/loader/component_loaders/text_encoder_loader.py

@@ -27,6 +27,13 @@ from sglang.multimodal_gen.runtime.layers.linear import (
     LinearBase,
     UnquantizedLinearMethod,
 )
+from sglang.multimodal_gen.runtime.layers.quantization.comfy_fp8 import ComfyFp8Config
+from sglang.multimodal_gen.runtime.layers.quantization.configs.base_config import (
+    QuantizationConfig,
+)
+from sglang.multimodal_gen.runtime.layers.quantization.configs.kitchen_int8_config import (
+    KitchenInt8Config,
+)
 from sglang.multimodal_gen.runtime.loader.component_loaders.component_loader import (
     ComponentCheckpointUnsupportedError,
     ComponentLoader,
@@ -34,6 +41,7 @@ from sglang.multimodal_gen.runtime.loader.component_loaders.component_loader imp
     uses_native_transformers_bnb4,
 )
 from sglang.multimodal_gen.runtime.loader.utils import (
+    get_param_names_mapping,
     set_default_torch_dtype,
     skip_init_modules,
 )
@@ -65,6 +73,8 @@ from sglang.multimodal_gen.runtime.utils.logging_utils import init_logger
 from sglang.multimodal_gen.runtime.utils.quantization_utils import (
     get_quant_config,
     get_quant_config_from_safetensors_metadata,
+    inspect_comfy_quant_markers,
+    resolve_comfy_checkpoint_quantization,
 )
 from sglang.multimodal_gen.runtime.weights.source import (
     materialize_weight,
@@ -104,6 +114,7 @@ def _get_encoder_quant_config(
     component_config: dict,
     component_model_path: str,
     component_weights_path: str,
+    model_cls: type[nn.Module] | None = None,
 ):
     quant_config = get_quant_config(component_config, component_model_path)
     if (
@@ -114,6 +125,27 @@ def _get_encoder_quant_config(
         quant_config = get_quant_config_from_safetensors_metadata(
             component_weights_path
         )
+    if quant_config is None and component_weights_path.endswith(".safetensors"):
+        name_mapper = None
+        if model_cls is not None:
+            mapping = vars(model_cls).get("param_names_mapping", {})
+            if mapping:
+                mapping_fn = get_param_names_mapping(mapping)
+
+                def name_mapper(name: str) -> str:
+                    mapped_name, merge_index, _ = mapping_fn(name)
+                    if merge_index is not None:
+                        raise ValueError(
+                            "Comfy quantized component weights cannot use a "
+                            "stacked parameter-name mapping"
+                        )
+                    return mapped_name
+
+        markers = inspect_comfy_quant_markers(
+            [component_weights_path],
+            param_name_mapper=name_mapper,
+        )
+        quant_config = resolve_comfy_checkpoint_quantization(markers)
     return quant_config
 
 
@@ -140,8 +172,9 @@ def _configure_encoder_quantization(
             component_config,
             component_model_path,
             component_weights_path,
+            model_cls,
         )
-    except (KeyError, TypeError, ValueError) as error:
+    except (KeyError, NotImplementedError, TypeError, ValueError) as error:
         raise ComponentCheckpointUnsupportedError(
             f"Cannot configure checkpoint quantization for {component_name!r}: {error}"
         ) from error
@@ -224,7 +257,7 @@ def _module_tensor_device(module: nn.Module) -> torch.device | None:
 
 def _process_quantized_encoder_weights(
     model: nn.Module,
-    process_device: torch.device,
+    process_device: torch.device | None,
     component_name: str,
 ) -> int:
     processed_layers = 0
@@ -236,7 +269,11 @@ def _process_quantized_encoder_weights(
             continue
 
         origin_device = _module_tensor_device(module)
-        should_stage = origin_device is not None and origin_device != process_device
+        should_stage = (
+            process_device is not None
+            and origin_device is not None
+            and origin_device != process_device
+        )
         if should_stage:
             module.to(process_device)
         try:
@@ -258,18 +295,27 @@ def _process_quantized_encoder_weights(
 def _require_quantized_encoder_layers(
     model: nn.Module,
     component_name: str,
+    quant_config: QuantizationConfig | None = None,
 ) -> None:
-    if any(
+    has_quantized_layers = any(
         isinstance(module, LinearBase)
         and module.quant_method is not None
         and not isinstance(module.quant_method, UnquantizedLinearMethod)
         for module in model.modules()
-    ):
-        return
-    raise ComponentCheckpointUnsupportedError(
-        f"The native {type(model).__name__} implementation does not construct "
-        f"quantized linear layers for {component_name!r}"
     )
+    if not has_quantized_layers:
+        raise ComponentCheckpointUnsupportedError(
+            f"The native {type(model).__name__} implementation does not construct "
+            f"quantized linear layers for {component_name!r}"
+        )
+    if isinstance(quant_config, (ComfyFp8Config, KitchenInt8Config)):
+        missing = set(quant_config.layer_markers) - set(quant_config.selected)
+        if missing:
+            raise ComponentCheckpointUnsupportedError(
+                f"The native {type(model).__name__} implementation did not consume "
+                f"Comfy quantization markers for {component_name!r}: "
+                f"{sorted(missing)[:5]}"
+            )
 
 
 def _checkpoint_bytes(model_path: str) -> int:
@@ -478,6 +524,12 @@ class TextEncoderLoader(ComponentLoader):
             Callable[[str], bool] | None,
             getattr(model, "should_materialize_checkpoint_weight", None),
         )
+
+        def include_checkpoint_weight(name: str) -> bool:
+            return not name.endswith(".comfy_quant") and (
+                key_filter is None or key_filter(name)
+            )
+
         primary_weights = TextEncoderLoader.Source(
             model_path,
             prefix="",
@@ -487,7 +539,7 @@ class TextEncoderLoader(ComponentLoader):
         yield from self._get_weights_iterator(
             primary_weights,
             to_cpu,
-            key_filter,
+            include_checkpoint_weight,
         )
 
         secondary_weights = cast(
@@ -498,7 +550,7 @@ class TextEncoderLoader(ComponentLoader):
             yield from self._get_weights_iterator(
                 source,
                 to_cpu,
-                key_filter,
+                include_checkpoint_weight,
             )
 
     def load_customized(
@@ -566,14 +618,23 @@ class TextEncoderLoader(ComponentLoader):
             encoder_index
         ]
         # TODO(will): add support for other dtypes
-        return self.load_model(
+        try:
-            component_weights_path,
+            return self.load_model(
-            encoder_config,
+                component_weights_path,
-            server_args,
+                encoder_config,
-            encoder_dtype,
+                server_args,
-            component_starts_on_cpu=component_starts_on_cpu,
+                encoder_dtype,
-            component_name=component_name,
+                component_starts_on_cpu=component_starts_on_cpu,
-        )
+                component_name=component_name,
+            )
+        except ComponentCheckpointUnsupportedError:
+            raise
+        except Exception as error:
+            if encoder_config.quant_config is None:
+                raise
+            raise ComponentCheckpointUnsupportedError(
+                f"Failed to load quantized native {component_name!r}: {error}"
+            ) from error
 
     @staticmethod
     def _extract_encoder_index(component_name: str) -> int:
@@ -689,7 +750,9 @@ class TextEncoderLoader(ComponentLoader):
             model.bind_encoder_tp_group(encoder_tp_group)
 
             if quant_config is not None:
-                _require_quantized_encoder_layers(model, component_name)
+                _require_quantized_encoder_layers(
+                    model, component_name, quant_config=quant_config
+                )
 
             if component_starts_on_cpu and (
                 current_platform.is_mps() or _keep_this_checkpoint_mapped(model_path)
@@ -713,9 +776,15 @@ class TextEncoderLoader(ComponentLoader):
             )
 
             if quant_config is not None:
+                postprocess_device: torch.device | None = local_torch_device
+                if (
+                    isinstance(quant_config, KitchenInt8Config)
+                    and quant_config.is_checkpoint_int8_serialized
+                ):
+                    postprocess_device = None
                 processed_layers = _process_quantized_encoder_weights(
                     model,
-                    local_torch_device,
+                    postprocess_device,
                     component_name,
                 )
                 logger.info(

python/sglang/multimodal_gen/runtime/loader/minimax_h3_weights.py

@@ -1,17 +1,16 @@
 # SPDX-License-Identifier: Apache-2.0
 """Checkpoint inspection for MiniMax-H3 transformer overrides."""
 
-import json
 from typing import Any
 
 from safetensors import safe_open
 
-from sglang.multimodal_gen.runtime.layers.quantization.comfy_fp8 import ComfyFp8Config
 from sglang.multimodal_gen.runtime.layers.quantization.configs.base_config import (
     QuantizationConfig,
 )
-from sglang.multimodal_gen.runtime.layers.quantization.configs.kitchen_int8_config import (
+from sglang.multimodal_gen.runtime.utils.quantization_utils import (
-    KitchenInt8Config,
+    inspect_comfy_quant_markers,
+    resolve_comfy_checkpoint_quantization,
 )
 
 
@@ -24,15 +23,11 @@ def inspect_minimax_h3_safetensors(
 ) -> tuple[tuple[int, int] | None, dict[str, dict[str, Any]]]:
     """Read H3 architecture metadata and Comfy per-layer format markers."""
     adaln_curve_shape = None
-    layer_markers: dict[str, dict[str, Any]] = {}
+    layer_markers = inspect_comfy_quant_markers(safetensors_list)
-    checkpoint_keys: set[str] = set()
-    checkpoint_meta: dict[str, tuple[str, tuple[int, ...]]] = {}
-    fp8_weight_prefixes: set[str] = set()
 
     for path in safetensors_list:
         with safe_open(path, framework="pt", device="cpu") as checkpoint:
             keys = checkpoint.keys()
-            checkpoint_keys.update(keys)
             if "adaln_t_table" in keys:
                 shape = tuple(checkpoint.get_slice("adaln_t_table").get_shape())
                 if len(shape) != 2 or shape[0] < 2:
@@ -47,96 +42,13 @@ def inspect_minimax_h3_safetensors(
                     )
                 adaln_curve_shape = shape
 
-            for key in keys:
-                if key.endswith((".weight", ".weight_scale")):
-                    tensor_slice = checkpoint.get_slice(key)
-                    dtype = tensor_slice.get_dtype()
-                    checkpoint_meta[key] = (
-                        dtype,
-                        tuple(tensor_slice.get_shape()),
-                    )
-                    if key.endswith(".weight") and dtype == "F8_E4M3":
-                        fp8_weight_prefixes.add(key.removesuffix(".weight"))
-                if not key.endswith(".comfy_quant"):
-                    continue
-                try:
-                    marker = json.loads(checkpoint.get_tensor(key).numpy().tobytes())
-                except (json.JSONDecodeError, UnicodeDecodeError) as exc:
-                    raise ValueError(
-                        f"Invalid Comfy quantization marker {key!r} in {path}"
-                    ) from exc
-                if not isinstance(marker, dict):
-                    raise ValueError(
-                        f"Comfy quantization marker {key!r} must contain a JSON object"
-                    )
-                prefix = key.removesuffix(".comfy_quant")
-                previous = layer_markers.get(prefix)
-                if previous is not None and previous != marker:
-                    raise ValueError(
-                        f"Conflicting Comfy quantization markers for {prefix!r}"
-                    )
-                layer_markers[prefix] = marker
-
-    if layer_markers:
-        missing_markers = fp8_weight_prefixes - layer_markers.keys()
-        if missing_markers:
-            raise ValueError(
-                "MiniMax-H3 FP8 weights are missing comfy_quant metadata: "
-                f"{sorted(missing_markers)[:5]}"
-            )
-
-    for prefix, marker in layer_markers.items():
-        marker_format = marker.get("format")
-        required = {f"{prefix}.weight", f"{prefix}.weight_scale"}
-        if marker_format == "float8_e4m3fn" and not marker.get(
-            "full_precision_matrix_mult", False
-        ):
-            required.add(f"{prefix}.input_scale")
-        if marker_format not in ("float8_e4m3fn", "int8_tensorwise"):
-            continue
-        missing = required - checkpoint_keys
-        if missing:
-            raise ValueError(
-                f"MiniMax-H3 Comfy layer {prefix!r} is missing checkpoint "
-                f"tensors: {sorted(missing)}"
-            )
-        if marker_format == "int8_tensorwise":
-            weight_dtype, weight_shape = checkpoint_meta[f"{prefix}.weight"]
-            scale_dtype, scale_shape = checkpoint_meta[f"{prefix}.weight_scale"]
-            if weight_dtype != "I8" or scale_dtype != "F32":
-                raise ValueError(
-                    f"MiniMax-H3 Comfy INT8 layer {prefix!r} needs I8 weights "
-                    f"and F32 scales, got {weight_dtype} and {scale_dtype}"
-                )
-            if len(weight_shape) != 2:
-                raise ValueError(
-                    f"MiniMax-H3 Comfy INT8 layer {prefix!r} needs a 2D weight, "
-                    f"got {weight_shape}"
-                )
-            expected_scale_shape = (weight_shape[0], 1)
-            if scale_shape != expected_scale_shape:
-                raise ValueError(
-                    f"MiniMax-H3 Comfy INT8 layer {prefix!r} needs scale shape "
-                    f"{expected_scale_shape}, got {scale_shape}"
-                )
-
     return adaln_curve_shape, layer_markers
 
 
 def resolve_minimax_h3_checkpoint_quantization(
     layer_markers: dict[str, dict[str, Any]],
 ) -> QuantizationConfig | None:
-    if not layer_markers:
+    return resolve_comfy_checkpoint_quantization(layer_markers)
-        return None
-
-    formats = sorted({str(marker.get("format")) for marker in layer_markers.values()})
-    if formats == ["int8_tensorwise"]:
-        return KitchenInt8Config(layer_markers=layer_markers)
-    if formats == ["float8_e4m3fn"]:
-        return ComfyFp8Config(layer_markers)
-    raise NotImplementedError(
-        "Unsupported MiniMax-H3 Comfy quantization format(s): " + ", ".join(formats)
-    )
 
 
 def validate_minimax_h3_checkpoint_variant(

python/sglang/multimodal_gen/runtime/models/encoders/minimax_h3_qwen3vl.py

@@ -16,12 +16,23 @@ from sglang.multimodal_gen.configs.models.encoders.minimax_h3_qwen3vl import (
     MiniMaxH3Qwen3VLConfig,
 )
 from sglang.multimodal_gen.runtime.distributed import get_local_torch_device
+from sglang.multimodal_gen.runtime.loader.utils import get_param_names_mapping
 from sglang.multimodal_gen.runtime.loader.weight_utils import default_weight_loader
 from sglang.multimodal_gen.runtime.models.encoders.base import TextEncoder
 from sglang.multimodal_gen.runtime.models.encoders.qwen3vl import Qwen3VLModel
 
 MINIMAX_H3_QWEN3VL_HIDDEN_DIM = 5120
 _LAYER_WEIGHT_RE = re.compile(r"^model\.language_model\.layers\.(\d+)\.")
+_PARAM_NAMES_MAPPING = {
+    r"^model\.(embed_tokens|layers|norm|rotary_emb)\.": r"model.language_model.\1.",
+    r"^visual\.": r"model.visual.",
+    r"^(model\.visual\.blocks\.\d+\.attn\.)qkv\.": r"\1qkv_proj.",
+}
+_MAP_CHECKPOINT_NAME = get_param_names_mapping(_PARAM_NAMES_MAPPING)
+
+
+def _map_checkpoint_name(name: str) -> str:
+    return _MAP_CHECKPOINT_NAME(name)[0]
 
 
 def _is_unconsumed_checkpoint_weight(name: str) -> bool:
@@ -46,9 +57,11 @@ class MiniMaxH3Qwen3VLEncoder(TextEncoder):
     layer_names = [*TextEncoder.layer_names, "model.visual.blocks"]
 
     supports_dp_encode = True
+    param_names_mapping = _PARAM_NAMES_MAPPING
 
     @staticmethod
     def should_materialize_checkpoint_weight(name: str) -> bool:
+        name = _map_checkpoint_name(name)
         return (
             "rotary_emb.inv_freq" not in name
             and not _is_unconsumed_checkpoint_weight(name)
@@ -67,6 +80,7 @@ class MiniMaxH3Qwen3VLEncoder(TextEncoder):
             arch,
             quant_config=config.quant_config,
             use_tensor_parallel=True,
+            prefix="model",
         )
         # H3 consumes the unnormalized output immediately after layer 49.
         self.model.language_model.norm = nn.Identity()
@@ -181,9 +195,10 @@ class MiniMaxH3Qwen3VLEncoder(TextEncoder):
         params = dict(self.named_parameters(remove_duplicate=False))
         loaded: set[str] = set()
         for name, loaded_weight in weights:
+            name = _map_checkpoint_name(name)
             if not self.should_materialize_checkpoint_weight(name):
                 continue
-            param_name = name.replace(".attn.qkv.", ".attn.qkv_proj.")
+            param_name = name
             param = params.get(param_name)
             if param is None:
                 raise KeyError(

python/sglang/multimodal_gen/runtime/models/encoders/qwen3vl.py

@@ -37,6 +37,7 @@ from sglang.multimodal_gen.runtime.models.encoders.qwen_vl_rope import (
     build_qwen_vl_text_rope,
 )
 from sglang.multimodal_gen.runtime.platforms import AttentionBackendEnum
+from sglang.multimodal_gen.runtime.utils.common import add_prefix
 from sglang.srt.layers.layernorm import RMSNorm
 
 """Inference-only Qwen3-VL model compatible with HuggingFace weights."""
@@ -165,6 +166,10 @@ def _make_text_row_linear(
     use_row_parallel = (
         use_tensor_parallel and tp_size > 1 and in_features % tp_size == 0
     )
+    if use_row_parallel and quant_config is not None:
+        use_row_parallel = quant_config.supports_input_partition(
+            prefix, in_features // tp_size
+        )
     if use_weight_only_fp8:
         if use_row_parallel:
             return WeightOnlyFP8RowParallelLinear(
@@ -492,6 +497,7 @@ class Qwen3VLTextModel(nn.Module):
         quant_config: QuantizationConfig | None = None,
         use_weight_only_fp8: bool = False,
         use_tensor_parallel: bool = False,
+        prefix: str = "",
     ):
         super().__init__()
         self.config = config
@@ -509,7 +515,7 @@ class Qwen3VLTextModel(nn.Module):
                     quant_config=quant_config,
                     use_weight_only_fp8=use_weight_only_fp8,
                     use_tensor_parallel=use_tensor_parallel,
-                    prefix=f"layers.{layer_idx}",
+                    prefix=add_prefix(f"layers.{layer_idx}", prefix),
                 )
                 for layer_idx in range(config.num_hidden_layers)
             ]
@@ -670,6 +676,7 @@ class Qwen3VLModel(nn.Module):
         *,
         quant_config: QuantizationConfig | None = None,
         use_tensor_parallel: bool = False,
+        prefix: str = "",
     ):
         super().__init__()
         self.visual = Qwen3VLVisionTransformer(config.vision_config)
@@ -677,6 +684,7 @@ class Qwen3VLModel(nn.Module):
             config.text_config,
             quant_config=quant_config,
             use_tensor_parallel=use_tensor_parallel,
+            prefix=add_prefix("language_model", prefix),
         )
         self.rope_deltas = None  # cache rope_deltas here
         self.config = config

python/sglang/multimodal_gen/runtime/utils/quantization_utils.py

@@ -4,7 +4,7 @@ import os
 import re
 import struct
 from pathlib import Path
-from typing import Any, Dict, List, Optional
+from typing import Any, Callable, Dict, List, Optional
 
 from safetensors import safe_open
 
@@ -12,6 +12,10 @@ from sglang.multimodal_gen.runtime.layers.quantization import (
     QuantizationConfig,
     get_quantization_config,
 )
+from sglang.multimodal_gen.runtime.layers.quantization.comfy_fp8 import ComfyFp8Config
+from sglang.multimodal_gen.runtime.layers.quantization.configs.kitchen_int8_config import (
+    KitchenInt8Config,
+)
 from sglang.multimodal_gen.runtime.utils.logging_utils import init_logger
 from sglang.srt.layers.modelopt_utils import canonicalize_modelopt_quant_algo
 from sglang.srt.model_loader.checkpoint_quantization import (
@@ -21,6 +25,111 @@ from sglang.srt.model_loader.checkpoint_quantization import (
 logger = init_logger(__name__)
 
 
+def inspect_comfy_quant_markers(
+    safetensors_list: list[str],
+    param_name_mapper: Callable[[str], str] | None = None,
+) -> dict[str, dict[str, Any]]:
+    """Read and validate Comfy's tensor-level quantization markers."""
+    checkpoint_meta: dict[str, tuple[str, tuple[int, ...]]] = {}
+    raw_markers: dict[str, dict[str, Any]] = {}
+    marked_dtype_weight_prefixes: set[str] = set()
+
+    for path in safetensors_list:
+        with safe_open(path, framework="pt", device="cpu") as checkpoint:
+            for key in checkpoint.keys():
+                tensor_slice = checkpoint.get_slice(key)
+                checkpoint_meta[key] = (
+                    tensor_slice.get_dtype(),
+                    tuple(tensor_slice.get_shape()),
+                )
+                if key.endswith(".weight") and tensor_slice.get_dtype() in (
+                    "F8_E4M3",
+                    "I8",
+                ):
+                    marked_dtype_weight_prefixes.add(key.removesuffix(".weight"))
+                if not key.endswith(".comfy_quant"):
+                    continue
+                try:
+                    marker = json.loads(checkpoint.get_tensor(key).numpy().tobytes())
+                except (json.JSONDecodeError, UnicodeDecodeError) as exc:
+                    raise ValueError(
+                        f"Invalid Comfy quantization marker {key!r} in {path}"
+                    ) from exc
+                if not isinstance(marker, dict):
+                    raise ValueError(
+                        f"Comfy quantization marker {key!r} must contain a JSON object"
+                    )
+                prefix = key.removesuffix(".comfy_quant")
+                previous = raw_markers.get(prefix)
+                if previous is not None and previous != marker:
+                    raise ValueError(
+                        f"Conflicting Comfy quantization markers for {prefix!r}"
+                    )
+                raw_markers[prefix] = marker
+
+    missing_markers = marked_dtype_weight_prefixes - raw_markers.keys()
+    if missing_markers:
+        raise ValueError(
+            "Quantized weights are missing comfy_quant metadata: "
+            f"{sorted(missing_markers)[:5]}"
+        )
+
+    for prefix, marker in raw_markers.items():
+        marker_format = marker.get("format")
+        required = {f"{prefix}.weight", f"{prefix}.weight_scale"}
+        if marker_format == "float8_e4m3fn" and not marker.get(
+            "full_precision_matrix_mult", False
+        ):
+            required.add(f"{prefix}.input_scale")
+        if marker_format not in ("float8_e4m3fn", "int8_tensorwise"):
+            continue
+        missing = required - checkpoint_meta.keys()
+        if missing:
+            raise ValueError(
+                f"Comfy layer {prefix!r} is missing checkpoint tensors: "
+                f"{sorted(missing)}"
+            )
+        if marker_format != "int8_tensorwise":
+            continue
+        weight_dtype, weight_shape = checkpoint_meta[f"{prefix}.weight"]
+        scale_dtype, scale_shape = checkpoint_meta[f"{prefix}.weight_scale"]
+        if weight_dtype != "I8" or scale_dtype != "F32":
+            raise ValueError(
+                f"Comfy INT8 layer {prefix!r} needs I8 weights and F32 scales, "
+                f"got {weight_dtype} and {scale_dtype}"
+            )
+        if len(weight_shape) != 2 or scale_shape != (weight_shape[0], 1):
+            raise ValueError(
+                f"Comfy INT8 layer {prefix!r} has incompatible weight/scale "
+                f"shapes: {weight_shape} and {scale_shape}"
+            )
+
+    mapped_markers: dict[str, dict[str, Any]] = {}
+    for prefix, marker in raw_markers.items():
+        mapped_prefix = param_name_mapper(prefix) if param_name_mapper else prefix
+        if mapped_prefix in mapped_markers:
+            raise ValueError(
+                f"Comfy markers collide after parameter mapping at {mapped_prefix!r}"
+            )
+        mapped_markers[mapped_prefix] = marker
+    return mapped_markers
+
+
+def resolve_comfy_checkpoint_quantization(
+    layer_markers: dict[str, dict[str, Any]],
+) -> QuantizationConfig | None:
+    if not layer_markers:
+        return None
+    formats = sorted({str(marker.get("format")) for marker in layer_markers.values()})
+    if formats == ["int8_tensorwise"]:
+        return KitchenInt8Config(layer_markers=layer_markers)
+    if formats == ["float8_e4m3fn"]:
+        return ComfyFp8Config(layer_markers)
+    raise NotImplementedError(
+        "Unsupported Comfy quantization format(s): " + ", ".join(formats)
+    )
+
+
 def normalize_flat_modelopt_quant_config(
     quant_cfg: dict[str, Any] | None,
 ) -> dict[str, Any] | None:

python/sglang/multimodal_gen/test/unit/test_text_encoder_loader.py

@@ -1,12 +1,18 @@
+import json
+import tempfile
 import unittest
 from types import SimpleNamespace
 from unittest import mock
 
 import torch
 import transformers
+from safetensors.torch import save_file
 from torch import nn
 
 from sglang.multimodal_gen.runtime.layers.linear import LinearBase
+from sglang.multimodal_gen.runtime.layers.quantization.configs.kitchen_int8_config import (
+    KitchenInt8Config,
+)
 from sglang.multimodal_gen.runtime.layers.quantization.fp8 import Fp8Config
 from sglang.multimodal_gen.runtime.loader.component_loaders.component_loader import (
     ComponentCheckpointUnsupportedError,
@@ -135,6 +141,9 @@ class TestMiniMaxH3CheckpointFilter(unittest.TestCase):
             "lm_head.weight": False,
             "model.language_model.rotary_emb.inv_freq": False,
             "model.visual.blocks.0.attn.qkv.weight": True,
+            "model.layers.49.self_attn.q_proj.weight": True,
+            "model.layers.50.self_attn.q_proj.weight": False,
+            "visual.blocks.0.attn.qkv.weight": True,
             "language_model.layers.63.mlp.down_proj.weight": True,
             "module.model.language_model.layers.63.mlp.down_proj.weight": True,
         }
@@ -163,6 +172,25 @@ class TestMiniMaxH3CheckpointFilter(unittest.TestCase):
             torch.tensor([1.0, 2.0]),
         )
 
+    def test_comfy_language_checkpoint_name_maps_to_native_namespace(self):
+        encoder = MiniMaxH3Qwen3VLEncoder.__new__(MiniMaxH3Qwen3VLEncoder)
+        torch.nn.Module.__init__(encoder)
+        encoder.model = torch.nn.Module()
+        encoder.model.language_model = torch.nn.Module()
+        layer = torch.nn.Module()
+        layer.self_attn = torch.nn.Module()
+        layer.self_attn.q_proj = torch.nn.Linear(2, 2, bias=False)
+        encoder.model.language_model.layers = torch.nn.ModuleList([layer])
+        source = torch.tensor([[1.0, 2.0], [3.0, 4.0]])
+
+        loaded = encoder.load_weights(
+            [("model.layers.0.self_attn.q_proj.weight", source)]
+        )
+
+        target_name = "model.language_model.layers.0.self_attn.q_proj.weight"
+        self.assertEqual(loaded, {target_name})
+        torch.testing.assert_close(layer.self_attn.q_proj.weight, source)
+
 
 class TestTextEncoderQuantization(unittest.TestCase):
     def setUp(self):
@@ -212,6 +240,49 @@ class TestTextEncoderQuantization(unittest.TestCase):
         self.assertIs(model_config.quant_config, self.serialized)
         get_file_quant_config.assert_called_once_with("/weights/encoder.safetensors")
 
+    def test_comfy_int8_weight_file_configures_native_encoder(self):
+        self.get_quant_config.return_value = None
+        marker = json.dumps(
+            {
+                "format": "int8_tensorwise",
+                "convrot": True,
+                "convrot_groupsize": 256,
+            }
+        ).encode()
+        with tempfile.NamedTemporaryFile(suffix=".safetensors") as checkpoint:
+            save_file(
+                {
+                    "model.layers.0.self_attn.q_proj.weight": torch.ones(
+                        (2, 256), dtype=torch.int8
+                    ),
+                    "model.layers.0.self_attn.q_proj.weight_scale": torch.ones((2, 1)),
+                    "model.layers.0.self_attn.q_proj.comfy_quant": torch.tensor(
+                        list(marker), dtype=torch.uint8
+                    ),
+                },
+                checkpoint.name,
+            )
+            model_config = SimpleNamespace(quant_config=None)
+            with mock.patch(
+                "sglang.multimodal_gen.runtime.loader.component_loaders."
+                "text_encoder_loader.get_quant_config_from_safetensors_metadata",
+                return_value=None,
+            ):
+                _configure_encoder_quantization(
+                    model_config,
+                    MiniMaxH3Qwen3VLEncoder,
+                    {},
+                    "/model/text_encoder",
+                    checkpoint.name,
+                    "text_encoder",
+                )
+
+        self.assertIsInstance(model_config.quant_config, KitchenInt8Config)
+        self.assertEqual(
+            set(model_config.quant_config.layer_markers),
+            {"model.language_model.layers.0.self_attn.q_proj"},
+        )
+
     def test_encoder_must_use_native_loader(self):
         model_config = SimpleNamespace(quant_config=None)
         with self.assertRaisesRegex(
@@ -350,6 +421,25 @@ class TestQuantizedTextEncoderPostprocess(unittest.TestCase):
         ):
             _require_quantized_encoder_layers(nn.Linear(2, 2), "text_encoder")
 
+    def test_rejects_unconsumed_comfy_marker(self):
+        config = KitchenInt8Config(
+            layer_markers={
+                "visual.proj": {
+                    "format": "int8_tensorwise",
+                    "convrot": True,
+                    "convrot_groupsize": 256,
+                }
+            }
+        )
+        with self.assertRaisesRegex(
+            ComponentCheckpointUnsupportedError, "did not consume"
+        ):
+            _require_quantized_encoder_layers(
+                _QuantizedEncoder(_RecordingQuantMethod()),
+                "text_encoder",
+                quant_config=config,
+            )
+
     def test_processes_quantized_layers_without_moving_the_model(self):
         quant_method = _RecordingQuantMethod()
         model = _QuantizedEncoder(quant_method)

python/sglang/multimodal_gen/test/unit/test_transformer_quant.py

@@ -310,6 +310,8 @@ class TestTransformerQuantHelpers(unittest.TestCase):
         self.assertTrue(config.checkpoint_uses_native_qkv_layout)
         self.assertFalse(KitchenInt8Config().checkpoint_uses_native_qkv_layout)
         self.assertFalse(_needs_device_weight_postprocess(config))
+        self.assertTrue(config.supports_input_partition("blocks.0.mlp.fc1", 6400))
+        self.assertFalse(config.supports_input_partition("blocks.0.mlp.fc1", 3200))
 
     @patch(
         "sglang.multimodal_gen.runtime.layers.quantization.kitchen_int8."