Upload dataset loader script

Pollen20LDet.py

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+
+import collections
+import json
+import os
+
+import datasets
+
+
+_HOMEPAGE = "https://www.kaggle.com/datasets/nataliakhanzhina/pollen20ldet"
+_LICENSE = "CC BY 4.0"
+_CITATION = """\
+@misc{ pollen20ldet,
+    title = { Combating data incompetence in pollen images detection and classification for pollinosis prevention },
+    type = { Open Source Dataset },
+    author = { Khanzhina, Natalia and Filchenkov, Andrey and Minaeva, Natalia and Novoselova, Larisa and Petukhov, Maxim and Kharisova, Irina and Pinaeva, Julia and Zamorin, Georgiy and Putin, Evgeny and Zamyatina, Elena and others},
+    howpublished = { \\url{ https://www.kaggle.com/datasets/nataliakhanzhina/pollen20ldet } },
+    url = { https://www.kaggle.com/datasets/nataliakhanzhina/pollen20ldet },
+    journal = { Computers in biology and medicine },
+    volume={140},
+    pages={105064},
+    publisher = { Elsevier },
+    year = { 2022 },
+}
+"""
+
+### I want to look at multiple ways to load categories. Pollen has multiple classification levels and is usually classified via latin version of the term
+
+_CATEGORIES = [
+    'buckwheat',
+    'clover',
+    'angelica',
+    'angelica_garden',
+    'willow',
+    'hill_mustard',
+    'linden',
+    'meadow_pink',
+    'alder',
+    'birch',
+    'fireweed',
+    'nettle',
+    'pigweed',
+    'plantain',
+    'sorrel',
+    'grass',
+    'pine',
+    'maple',
+    'hazel',
+    'mugwort'
+]
+
+_ANNOTATION_FILENAME = "_annotations.json"
+
+
+class POLLENDETECTIONConfig(datasets.BuilderConfig):
+    """Builder Config for pollen-detection"""
+
+    def __init__(self, data_urls, **kwargs):
+        """
+        BuilderConfig for pollen-detection.
+        Args:
+          data_urls: `dict`, name to url to download the zip file from.
+          **kwargs: keyword arguments forwarded to super.
+        """
+        super(POLLENDETECTIONConfig, self).__init__(version=datasets.Version("1.0.0"), **kwargs)
+        self.data_urls = data_urls
+
+
+class POLLENDETECTION(datasets.GeneratorBasedBuilder):
+    """pollen-detection object detection dataset"""
+
+    VERSION = datasets.Version("1.0.0")
+    BUILDER_CONFIGS = [
+        POLLENDETECTIONConfig(
+            name="full",
+            description="Full version of pollen-detection dataset.",
+            data_urls={
+                "train": "https://huggingface.co/datasets/Charliesgt/Pollen20LDet/resolve/main/data/train.zip",
+                "valid": "https://huggingface.co/datasets/Charliesgt/Pollen20LDet/resolve/main/data/valid.zip",
+                "test": "https://huggingface.co/datasets/Charliesgt/Pollen20LDet/resolve/main/data/test.zip",
+            },
+        ),
+    ]
+
+    def _info(self):
+        features = datasets.Features(
+            {
+                "image_id": datasets.Value("int64"),
+                "image": datasets.Image(),
+                "width": datasets.Value("int32"),
+                "height": datasets.Value("int32"),
+                "objects": datasets.Sequence(
+                    {
+                        "id": datasets.Value("int64"),
+                        "area": datasets.Value("int64"),
+                        "bbox": datasets.Sequence(datasets.Value("float32"), length=4),
+                        "category": datasets.ClassLabel(names=_CATEGORIES),
+                    }
+                ),
+            }
+        )
+        return datasets.DatasetInfo(
+            features=features,
+            homepage=_HOMEPAGE,
+            citation=_CITATION,
+            license=_LICENSE,
+        )
+
+    def _split_generators(self, dl_manager):
+        data_files = dl_manager.download_and_extract(self.config.data_urls)
+        return [
+            datasets.SplitGenerator(
+                name=datasets.Split.TRAIN,
+                gen_kwargs={
+                    "folder_dir": data_files["train"],
+                },
+            ),
+            datasets.SplitGenerator(
+                name=datasets.Split.VALIDATION,
+                gen_kwargs={
+                    "folder_dir": data_files["valid"],
+                },
+            ),
+            datasets.SplitGenerator(
+                name=datasets.Split.TEST,
+                gen_kwargs={
+                    "folder_dir": data_files["test"],
+                },
+            ),
+]
+
+    def _generate_examples(self, folder_dir):
+        def process_annot(annot, category_id_to_category):
+            return {
+                "id": annot["id"],
+                "area": annot["area"],
+                "bbox": annot["bbox"],
+                "category": category_id_to_category[annot["category_id"]],
+            }
+
+        image_id_to_image = {}
+        idx = 0
+
+        annotation_filepath = os.path.join(folder_dir, _ANNOTATION_FILENAME)
+        with open(annotation_filepath, "r") as f:
+            annotations = json.load(f)
+        category_id_to_category = {category["id"]: category["name"] for category in annotations["categories"]}
+        image_id_to_annotations = collections.defaultdict(list)
+        for annot in annotations["annotations"]:
+            image_id_to_annotations[annot["image_id"]].append(annot)
+        filename_to_image = {image["file_name"]: image for image in annotations["images"]}
+
+        for filename in os.listdir(folder_dir):
+            filepath = os.path.join(folder_dir, filename)
+            if filename in filename_to_image:
+                image = filename_to_image[filename]
+                objects = [
+                    process_annot(annot, category_id_to_category) for annot in image_id_to_annotations[image["id"]]
+                ]
+                with open(filepath, "rb") as f:
+                    image_bytes = f.read()
+                yield idx, {
+                    "image_id": image["id"],
+                    "image": {"path": filepath, "bytes": image_bytes},
+                    "width": image["width"],
+                    "height": image["height"],
+                    "objects": objects,
+                }
+                idx += 1
+