Multi-weight support for MobileNetV3 prototype models (#4723)

* Adding multiweight support for mobilenetv3 prototype

torchvision/models/mobilenetv3.py

@@ -281,7 +281,7 @@ def _mobilenet_v3_conf(
     return inverted_residual_setting, last_channel
 
 
-def _mobilenet_v3_model(
+def _mobilenet_v3(
     arch: str,
     inverted_residual_setting: List[InvertedResidualConfig],
     last_channel: int,
@@ -309,7 +309,7 @@ def mobilenet_v3_large(pretrained: bool = False, progress: bool = True, **kwargs
     """
     arch = "mobilenet_v3_large"
     inverted_residual_setting, last_channel = _mobilenet_v3_conf(arch, **kwargs)
-    return _mobilenet_v3_model(arch, inverted_residual_setting, last_channel, pretrained, progress, **kwargs)
+    return _mobilenet_v3(arch, inverted_residual_setting, last_channel, pretrained, progress, **kwargs)
 
 
 def mobilenet_v3_small(pretrained: bool = False, progress: bool = True, **kwargs: Any) -> MobileNetV3:
@@ -323,4 +323,4 @@ def mobilenet_v3_small(pretrained: bool = False, progress: bool = True, **kwargs
     """
     arch = "mobilenet_v3_small"
     inverted_residual_setting, last_channel = _mobilenet_v3_conf(arch, **kwargs)
-    return _mobilenet_v3_model(arch, inverted_residual_setting, last_channel, pretrained, progress, **kwargs)
+    return _mobilenet_v3(arch, inverted_residual_setting, last_channel, pretrained, progress, **kwargs)

torchvision/prototype/models/__init__.py

@@ -3,5 +3,6 @@ from .resnet import *
 from .densenet import *
 from .vgg import *
 from .efficientnet import *
+from .mobilenetv3 import *
 from . import detection
 from . import quantization

torchvision/prototype/models/mobilenetv3.py

+import warnings
+from functools import partial
+from typing import Any, Optional, List
+
+from torchvision.transforms.functional import InterpolationMode
+
+from ...models.mobilenetv3 import MobileNetV3, _mobilenet_v3_conf, InvertedResidualConfig
+from ..transforms.presets import ImageNetEval
+from ._api import Weights, WeightEntry
+from ._meta import _IMAGENET_CATEGORIES
+
+
+__all__ = [
+    "MobileNetV3",
+    "MobileNetV3LargeWeights",
+    "MobileNetV3SmallWeights",
+    "mobilenet_v3_large",
+    "mobilenet_v3_small",
+]
+
+
+def _mobilenet_v3(
+    inverted_residual_setting: List[InvertedResidualConfig],
+    last_channel: int,
+    weights: Optional[Weights],
+    progress: bool,
+    **kwargs: Any,
+) -> MobileNetV3:
+    if weights is not None:
+        kwargs["num_classes"] = len(weights.meta["categories"])
+
+    model = MobileNetV3(inverted_residual_setting, last_channel, **kwargs)
+
+    if weights is not None:
+        model.load_state_dict(weights.state_dict(progress=progress))
+
+    return model
+
+
+_common_meta = {"size": (224, 224), "categories": _IMAGENET_CATEGORIES, "interpolation": InterpolationMode.BILINEAR}
+
+
+class MobileNetV3LargeWeights(Weights):
+    ImageNet1K_RefV1 = WeightEntry(
+        url="https://download.pytorch.org/models/mobilenet_v3_large-8738ca79.pth",
+        transforms=partial(ImageNetEval, crop_size=224),
+        meta={
+            **_common_meta,
+            "recipe": "https://github.com/pytorch/vision/tree/main/references/classification#mobilenetv3-large--small",
+            "acc@1": 74.042,
+            "acc@5": 91.340,
+        },
+    )
+
+
+class MobileNetV3SmallWeights(Weights):
+    ImageNet1K_RefV1 = WeightEntry(
+        url="https://download.pytorch.org/models/mobilenet_v3_small-047dcff4.pth",
+        transforms=partial(ImageNetEval, crop_size=224),
+        meta={
+            **_common_meta,
+            "recipe": "https://github.com/pytorch/vision/tree/main/references/classification#mobilenetv3-large--small",
+            "acc@1": 67.668,
+            "acc@5": 87.402,
+        },
+    )
+
+
+def mobilenet_v3_large(
+    weights: Optional[MobileNetV3LargeWeights] = None, progress: bool = True, **kwargs: Any
+) -> MobileNetV3:
+    if "pretrained" in kwargs:
+        warnings.warn("The argument pretrained is deprecated, please use weights instead.")
+        weights = MobileNetV3LargeWeights.ImageNet1K_RefV1 if kwargs.pop("pretrained") else None
+    weights = MobileNetV3LargeWeights.verify(weights)
+
+    inverted_residual_setting, last_channel = _mobilenet_v3_conf("mobilenet_v3_large", **kwargs)
+    return _mobilenet_v3(inverted_residual_setting, last_channel, weights, progress, **kwargs)
+
+
+def mobilenet_v3_small(
+    weights: Optional[MobileNetV3SmallWeights] = None, progress: bool = True, **kwargs: Any
+) -> MobileNetV3:
+    if "pretrained" in kwargs:
+        warnings.warn("The argument pretrained is deprecated, please use weights instead.")
+        weights = MobileNetV3SmallWeights.ImageNet1K_RefV1 if kwargs.pop("pretrained") else None
+    weights = MobileNetV3SmallWeights.verify(weights)
+
+    inverted_residual_setting, last_channel = _mobilenet_v3_conf("mobilenet_v3_small", **kwargs)
+    return _mobilenet_v3(inverted_residual_setting, last_channel, weights, progress, **kwargs)