add EuroSAT prototype dataset (#5452)

* add eurosat

* revert formatting

* port test and make style changes

* add eurosat to __init__

* fix pathlib error

* create dataset zipfile and revert pre commit changes

* remove unecessary variable in resources

* revert auto formatter changes and modify ufmt version

* revert change to contributing guide
Co-authored-by: Dbhasin1 <drishti_b@me.iitr.c.in>
Co-authored-by: Nicolas Hug <nicolashug@fb.com>

test/builtin_dataset_mocks.py

@@ -1327,6 +1327,24 @@ def cub200(info, root, config):
     return num_samples_map[config.split]
 
 
+@register_mock
+def eurosat(info, root, config):
+    data_folder = pathlib.Path(root, "eurosat", "2750")
+    data_folder.mkdir(parents=True)
+
+    num_examples_per_class = 3
+    classes = ("AnnualCrop", "Forest")
+    for cls in classes:
+        create_image_folder(
+            root=data_folder,
+            name=cls,
+            file_name_fn=lambda idx: f"{cls}_{idx}.jpg",
+            num_examples=num_examples_per_class,
+        )
+    make_zip(root, "EuroSAT.zip", data_folder)
+    return len(classes) * num_examples_per_class
+
+
 @register_mock
 def svhn(info, root, config):
     import scipy.io as sio

torchvision/prototype/datasets/_builtin/__init__.py

@@ -6,6 +6,7 @@ from .coco import Coco
 from .country211 import Country211
 from .cub200 import CUB200
 from .dtd import DTD
+from .eurosat import EuroSAT
 from .fer2013 import FER2013
 from .gtsrb import GTSRB
 from .imagenet import ImageNet

torchvision/prototype/datasets/_builtin/eurosat.py

+import pathlib
+from typing import Any, Dict, List, Tuple
+
+from torchdata.datapipes.iter import IterDataPipe, Mapper
+from torchvision.prototype.datasets.utils import Dataset, DatasetConfig, DatasetInfo, HttpResource, OnlineResource
+from torchvision.prototype.datasets.utils._internal import hint_sharding, hint_shuffling
+from torchvision.prototype.features import EncodedImage, Label
+
+
+class EuroSAT(Dataset):
+    def _make_info(self) -> DatasetInfo:
+        return DatasetInfo(
+            "eurosat",
+            homepage="https://github.com/phelber/eurosat",
+            categories=(
+                "AnnualCrop",
+                "Forest",
+                "HerbaceousVegetation",
+                "Highway",
+                "Industrial," "Pasture",
+                "PermanentCrop",
+                "Residential",
+                "River",
+                "SeaLake",
+            ),
+        )
+
+    def resources(self, config: DatasetConfig) -> List[OnlineResource]:
+        return [
+            HttpResource(
+                "https://madm.dfki.de/files/sentinel/EuroSAT.zip",
+                sha256="8ebea626349354c5328b142b96d0430e647051f26efc2dc974c843f25ecf70bd",
+            )
+        ]
+
+    def _prepare_sample(self, data: Tuple[str, Any]) -> Dict[str, Any]:
+        path, buffer = data
+        category = pathlib.Path(path).parent.name
+        return dict(
+            label=Label.from_category(category, categories=self.categories),
+            path=path,
+            image=EncodedImage.from_file(buffer),
+        )
+
+    def _make_datapipe(
+        self, resource_dps: List[IterDataPipe], *, config: DatasetConfig
+    ) -> IterDataPipe[Dict[str, Any]]:
+        dp = resource_dps[0]
+        dp = hint_sharding(dp)
+        dp = hint_shuffling(dp)
+        return Mapper(dp, self._prepare_sample)