Adding Weights classes for Resnet classification models (#4655)

* adding Weights classes for Resnet classification models

* Replacing BasicBlock by Bottleneck in all but 3 model contructors

* adding tests for prototype models

* fixing typo in environment variable

* Update test/test_prototype_models.py
Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>

* changing default value for PYTORCH_TEST_WITH_PROTOTYPE

* adding checks to compare outputs of the prototype vs old models

* refactoring prototype tests

* removing unused imports

* applying ufmt

* Update test/test_prototype_models.py
Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>

* Update test/test_prototype_models.py
Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>

* Update test/test_prototype_models.py
Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>

* Update test/test_prototype_models.py
Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>

* Update test/test_prototype_models.py
Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>

* Update test/test_prototype_models.py
Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>

* Update test/test_prototype_models.py
Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>
Co-authored-by: Vasilis Vryniotis <datumbox@users.noreply.github.com>

test/test_prototype_models.py

+import os
+
+import pytest
+import torch
+from common_utils import set_rng_seed, cpu_and_gpu
+from test_models import _assert_expected, _model_params
+from torchvision import models as original_models
+from torchvision.prototype import models
+
+
+def get_available_classification_models():
+    return [k for k, v in models.__dict__.items() if callable(v) and k[0].lower() == k[0] and k[0] != "_"]
+
+
+@pytest.mark.parametrize("model_name", get_available_classification_models())
+@pytest.mark.parametrize("dev", cpu_and_gpu())
+@pytest.mark.skipif(os.getenv("PYTORCH_TEST_WITH_PROTOTYPE", "0") == "0", reason="Prototype code tests are disabled")
+def test_classification_model(model_name, dev):
+    set_rng_seed(0)
+    defaults = {
+        "num_classes": 50,
+        "input_shape": (1, 3, 224, 224),
+    }
+    kwargs = {**defaults, **_model_params.get(model_name, {})}
+    input_shape = kwargs.pop("input_shape")
+    model = models.__dict__[model_name](**kwargs)
+    model.eval().to(device=dev)
+    x = torch.rand(input_shape).to(device=dev)
+    out = model(x)
+    _assert_expected(out.cpu(), model_name, prec=0.1)
+    assert out.shape[-1] == 50
+
+
+@pytest.mark.parametrize("model_name", get_available_classification_models())
+@pytest.mark.parametrize("dev", cpu_and_gpu())
+@pytest.mark.skipif(os.getenv("PYTORCH_TEST_WITH_PROTOTYPE", "0") == "0", reason="Prototype code tests are disabled")
+def test_old_vs_new_classification_factory(model_name, dev):
+    defaults = {
+        "pretrained": True,
+        "input_shape": (1, 3, 224, 224),
+    }
+    kwargs = {**defaults, **_model_params.get(model_name, {})}
+    input_shape = kwargs.pop("input_shape")
+    model_old = original_models.__dict__[model_name](**kwargs)
+    model_old.eval().to(device=dev)
+    x = torch.rand(input_shape).to(device=dev)
+    out_old = model_old(x)
+    # compare with new model builder parameterized in the old fashion way
+    model_new = models.__dict__[model_name](**kwargs)
+    model_new.eval().to(device=dev)
+    out_new = model_new(x)
+    torch.testing.assert_close(out_new, out_old, rtol=0.0, atol=0.0, check_dtype=False)
+
+
 def test_smoke():
     import torchvision.prototype.models  # noqa: F401

torchvision/prototype/models/resnet.py

@@ -8,7 +8,27 @@ from ._api import Weights, WeightEntry
 from ._meta import _IMAGENET_CATEGORIES
 
 
-__all__ = ["ResNet", "ResNet50Weights", "resnet50"]
+__all__ = [
+    "ResNet",
+    "ResNet18Weights",
+    "ResNet34Weights",
+    "ResNet50Weights",
+    "ResNet101Weights",
+    "ResNet152Weights",
+    "ResNeXt50_32x4dWeights",
+    "ResNeXt101_32x8dWeights",
+    "WideResNet50_2Weights",
+    "WideResNet101_2Weights",
+    "resnet18",
+    "resnet34",
+    "resnet50",
+    "resnet101",
+    "resnet152",
+    "resnext50_32x4d",
+    "resnext101_32x8d",
+    "wide_resnet50_2",
+    "wide_resnet101_2",
+]
 
 
 def _resnet(
@@ -35,6 +55,32 @@ _common_meta = {
 }
 
 
+class ResNet18Weights(Weights):
+    ImageNet1K_RefV1 = WeightEntry(
+        url="https://download.pytorch.org/models/resnet18-f37072fd.pth",
+        transforms=partial(ImageNetEval, crop_size=224),
+        meta={
+            **_common_meta,
+            "recipe": "",
+            "acc@1": 69.758,
+            "acc@5": 89.078,
+        },
+    )
+
+
+class ResNet34Weights(Weights):
+    ImageNet1K_RefV1 = WeightEntry(
+        url="https://download.pytorch.org/models/resnet34-b627a593.pth",
+        transforms=partial(ImageNetEval, crop_size=224),
+        meta={
+            **_common_meta,
+            "recipe": "",
+            "acc@1": 73.314,
+            "acc@5": 91.420,
+        },
+    )
+
+
 class ResNet50Weights(Weights):
     ImageNet1K_RefV1 = WeightEntry(
         url="https://download.pytorch.org/models/resnet50-0676ba61.pth",
@@ -58,6 +104,104 @@ class ResNet50Weights(Weights):
     )
 
 
+class ResNet101Weights(Weights):
+    ImageNet1K_RefV1 = WeightEntry(
+        url="https://download.pytorch.org/models/resnet101-63fe2227.pth",
+        transforms=partial(ImageNetEval, crop_size=224),
+        meta={
+            **_common_meta,
+            "recipe": "",
+            "acc@1": 77.374,
+            "acc@5": 93.546,
+        },
+    )
+
+
+class ResNet152Weights(Weights):
+    ImageNet1K_RefV1 = WeightEntry(
+        url="https://download.pytorch.org/models/resnet152-394f9c45.pth",
+        transforms=partial(ImageNetEval, crop_size=224),
+        meta={
+            **_common_meta,
+            "recipe": "",
+            "acc@1": 78.312,
+            "acc@5": 94.046,
+        },
+    )
+
+
+class ResNeXt50_32x4dWeights(Weights):
+    ImageNet1K_RefV1 = WeightEntry(
+        url="https://download.pytorch.org/models/resnext50_32x4d-7cdf4587.pth",
+        transforms=partial(ImageNetEval, crop_size=224),
+        meta={
+            **_common_meta,
+            "recipe": "",
+            "acc@1": 77.618,
+            "acc@5": 93.698,
+        },
+    )
+
+
+class ResNeXt101_32x8dWeights(Weights):
+    ImageNet1K_RefV1 = WeightEntry(
+        url="https://download.pytorch.org/models/resnext101_32x8d-8ba56ff5.pth",
+        transforms=partial(ImageNetEval, crop_size=224),
+        meta={
+            **_common_meta,
+            "recipe": "",
+            "acc@1": 79.312,
+            "acc@5": 94.526,
+        },
+    )
+
+
+class WideResNet50_2Weights(Weights):
+    ImageNet1K_RefV1 = WeightEntry(
+        url="https://download.pytorch.org/models/wide_resnet50_2-95faca4d.pth",
+        transforms=partial(ImageNetEval, crop_size=224),
+        meta={
+            **_common_meta,
+            "recipe": "",
+            "acc@1": 78.468,
+            "acc@5": 94.086,
+        },
+    )
+
+
+class WideResNet101_2Weights(Weights):
+    ImageNet1K_RefV1 = WeightEntry(
+        url="https://download.pytorch.org/models/wide_resnet101_2-32ee1156.pth",
+        transforms=partial(ImageNetEval, crop_size=224),
+        meta={
+            **_common_meta,
+            "recipe": "",
+            "acc@1": 78.848,
+            "acc@5": 94.284,
+        },
+    )
+
+
+def resnet18(weights: Optional[ResNet18Weights] = None, progress: bool = True, **kwargs: Any) -> ResNet:
+    if "pretrained" in kwargs:
+        warnings.warn("The argument pretrained is deprecated, please use weights instead.")
+        weights = ResNet18Weights.ImageNet1K_RefV1 if kwargs.pop("pretrained") else None
+
+    weights = ResNet18Weights.verify(weights)
+
+    return _resnet(BasicBlock, [2, 2, 2, 2], weights, progress, **kwargs)
+
+
+def resnet34(weights: Optional[ResNet34Weights] = None, progress: bool = True, **kwargs: Any) -> ResNet:
+    if "pretrained" in kwargs:
+        warnings.warn("The argument pretrained is deprecated, please use weights instead.")
+        weights = ResNet34Weights.ImageNet1K_RefV1 if kwargs.pop("pretrained") else None
+
+    weights = ResNet34Weights.verify(weights)
+
+    return _resnet(BasicBlock, [3, 4, 6, 3], weights, progress, **kwargs)
+
+
 def resnet50(weights: Optional[ResNet50Weights] = None, progress: bool = True, **kwargs: Any) -> ResNet:
     if "pretrained" in kwargs:
         warnings.warn("The argument pretrained is deprecated, please use weights instead.")
@@ -65,3 +209,65 @@ def resnet50(weights: Optional[ResNet50Weights] = None, progress: bool = True, *
     weights = ResNet50Weights.verify(weights)
 
     return _resnet(Bottleneck, [3, 4, 6, 3], weights, progress, **kwargs)
+
+
+def resnet101(weights: Optional[ResNet101Weights] = None, progress: bool = True, **kwargs: Any) -> ResNet:
+    if "pretrained" in kwargs:
+        warnings.warn("The argument pretrained is deprecated, please use weights instead.")
+        weights = ResNet101Weights.ImageNet1K_RefV1 if kwargs.pop("pretrained") else None
+
+    weights = ResNet101Weights.verify(weights)
+
+    return _resnet(Bottleneck, [3, 4, 23, 3], weights, progress, **kwargs)
+
+
+def resnet152(weights: Optional[ResNet152Weights] = None, progress: bool = True, **kwargs: Any) -> ResNet:
+    if "pretrained" in kwargs:
+        warnings.warn("The argument pretrained is deprecated, please use weights instead.")
+        weights = ResNet152Weights.ImageNet1K_RefV1 if kwargs.pop("pretrained") else None
+
+    weights = ResNet152Weights.verify(weights)
+
+    return _resnet(Bottleneck, [3, 8, 36, 3], weights, progress, **kwargs)
+
+
+def resnext50_32x4d(weights: Optional[ResNeXt50_32x4dWeights] = None, progress: bool = True, **kwargs: Any) -> ResNet:
+    if "pretrained" in kwargs:
+        warnings.warn("The argument pretrained is deprecated, please use weights instead.")
+        weights = ResNeXt50_32x4dWeights.ImageNet1K_RefV1 if kwargs.pop("pretrained") else None
+
+    weights = ResNeXt50_32x4dWeights.verify(weights)
+    kwargs["groups"] = 32
+    kwargs["width_per_group"] = 4
+    return _resnet(Bottleneck, [3, 4, 6, 3], weights, progress, **kwargs)
+
+
+def resnext101_32x8d(weights: Optional[ResNeXt101_32x8dWeights] = None, progress: bool = True, **kwargs: Any) -> ResNet:
+    if "pretrained" in kwargs:
+        warnings.warn("The argument pretrained is deprecated, please use weights instead.")
+        weights = ResNeXt101_32x8dWeights.ImageNet1K_RefV1 if kwargs.pop("pretrained") else None
+
+    weights = ResNeXt101_32x8dWeights.verify(weights)
+    kwargs["groups"] = 32
+    kwargs["width_per_group"] = 8
+    return _resnet(Bottleneck, [3, 4, 23, 3], weights, progress, **kwargs)
+
+
+def wide_resnet50_2(weights: Optional[WideResNet50_2Weights] = None, progress: bool = True, **kwargs: Any) -> ResNet:
+    if "pretrained" in kwargs:
+        warnings.warn("The argument pretrained is deprecated, please use weights instead.")
+        weights = WideResNet50_2Weights.ImageNet1K_RefV1 if kwargs.pop("pretrained") else None
+
+    weights = WideResNet50_2Weights.verify(weights)
+    kwargs["width_per_group"] = 64 * 2
+    return _resnet(Bottleneck, [3, 4, 6, 3], weights, progress, **kwargs)
+
+
+def wide_resnet101_2(weights: Optional[WideResNet101_2Weights] = None, progress: bool = True, **kwargs: Any) -> ResNet:
+    if "pretrained" in kwargs:
+        warnings.warn("The argument pretrained is deprecated, please use weights instead.")
+        weights = WideResNet101_2Weights.ImageNet1K_RefV1 if kwargs.pop("pretrained") else None
+
+    weights = WideResNet101_2Weights.verify(weights)
+    kwargs["width_per_group"] = 64 * 2
+    return _resnet(Bottleneck, [3, 4, 23, 3], weights, progress, **kwargs)