feat: implement SacredBuildingsDataset class for architectural style classification

sacred_buildings_loader.py

@@ -0,0 +1,166 @@
+import csv
+import json
+import os
+
+import datasets
+from PIL import Image
+import tarfile
+from io import BytesIO
+
+import logging
+import datasets
+from datasets.utils.logging import get_logger, tqdm
+
+logger = get_logger(__name__)          # <- same pattern used in HF scripts
+
+
+_DESCRIPTION = "WikiChurches is a dataset for architectural style classification"
+_HOMEPAGE = "https://huggingface.co/datasets/LZSI-2/Recognizing_the_styles_of_sacred_buildings"
+_LICENSE = "cc-by-nc-4.0"
+_CITATION = """@article{barz2021wikichurches,
+    title={WikiChurches: A Fine-Grained Dataset of Architectural Styles with Real-World Challenges},
+    author={Barz, Björn and Denzler, Joachim},
+    journal={arXiv preprint arXiv:2108.06959},
+    year={2021}
+}"""
+
+TAR_PARTS = 40
+
+_TAR_URLS =[f"https://huggingface.co/datasets/LZSI-2/Recognizing_the_styles_of_sacred_buildings/resolve/main/images/images_part{part_id}.tar" for part_id in range(1, TAR_PARTS + 1)]
+
+_URLS = {
+    "churches_json": "https://huggingface.co/datasets/LZSI-2/Recognizing_the_styles_of_sacred_buildings/resolve/main/churches.json",
+    "style_levels": "https://huggingface.co/datasets/LZSI-2/Recognizing_the_styles_of_sacred_buildings/resolve/main/style_levels.json",
+    "style_names": "https://huggingface.co/datasets/LZSI-2/Recognizing_the_styles_of_sacred_buildings/resolve/main/style_names.txt",
+}
+
+
+
+
+_DESCRIPTION = """WikiChurches is a dataset for architectural style classification"""
+_HOMEPAGE = "https://github.com/yourusername/sacred_buildings"
+
+
+class SacredBuildingsDataset(datasets.GeneratorBasedBuilder):
+    """Sacred Buildings Dataset with support for different hierarchy levels."""
+
+    VERSION = datasets.Version("0.0.1")
+
+    BUILDER_CONFIGS = [
+        datasets.BuilderConfig(
+            name="wc4", 
+            version=VERSION, 
+            description="Wiki Churches 4 main classes"
+        ),
+        datasets.BuilderConfig(
+            name="wc6", 
+            version=VERSION, 
+            description="Wiki Churches 6 largest classes"
+        ),
+        datasets.BuilderConfig(
+            name="wc14", 
+            version=VERSION, 
+            description="Wiki Churches 14 first-level classes"
+        ),
+    ]
+
+    DEFAULT_CONFIG_NAME = "wc4"
+
+    def _info(self):
+        features = datasets.Features({
+            "image": datasets.Image(),
+            "style": datasets.Value("string"),
+            "church_id": datasets.Value("string"),
+
+        })
+
+        return datasets.DatasetInfo(
+            description=_DESCRIPTION,
+            features=features,
+            homepage=_HOMEPAGE,
+            license=_LICENSE,
+            citation=_CITATION,
+        )
+
+
+    def _get_style_names(self, style_levels):
+        return style_levels.get(self.config.name, {})
+
+    def _split_generators(self, dl_manager):
+        """Returns SplitGenerators."""
+
+        downloaded_files = dl_manager.download(_TAR_URLS)
+        data_dir = dl_manager.download_and_extract(_URLS)
+
+
+        return [
+            datasets.SplitGenerator(
+                name=datasets.Split.TRAIN,
+                gen_kwargs={
+                    "file_paths": downloaded_files,
+                    "data_dir": data_dir,
+                },
+            ),
+        ]
+
+
+    def _trace_to_top_parent(self, style_id, hierarchy):
+        while style_id in hierarchy and hierarchy[style_id]["parent"]:
+            style_id = hierarchy[style_id]["parent"]
+        return style_id
+
+    def _generate_examples(self, file_paths, data_dir):
+        with open(data_dir["churches_json"], "r") as f:
+            churches_data = json.load(f)
+
+        with open(data_dir["style_levels"], "r") as f:
+            style_levels = json.load(f)
+
+        
+        style_levels = json.load(open(data_dir["style_levels"], "r"))
+        if self.config.name == "wc4":
+            domain_styles = list(style_levels["statistics"]["styles_by_size"].keys())[:4]
+        elif self.config.name == "wc6":
+            domain_styles = list(style_levels["statistics"]["styles_by_size"].keys())[:6]
+
+
+  
+
+        """Yields examples."""
+        # Load churches data
+        for filepath in file_paths:
+            logger.info(f"Processing {filepath.split('/')[-1]}")
+            with tarfile.open(filepath, "r") as tar:
+                for member in tqdm(tar.getmembers(),
+                                desc=f"{os.path.basename(filepath)}"):
+                    if member.isfile():
+
+                        image_file = tar.extractfile(member)
+
+
+                        church_id = member.name.split("_")[0]
+                        image_name = member.name
+                        if church_id not in churches_data:
+                            continue
+
+                        church_styles = churches_data[church_id]["styles"]
+
+                        top_level_set = set()
+                        for s_id in church_styles:
+                            top_parent = self._trace_to_top_parent(s_id, style_levels["hierarchy"])
+                            if top_parent in domain_styles:
+                                top_level_set.add(top_parent)
+
+                        if len(top_level_set) == 1:
+                            label_name = top_level_set.pop()
+
+                            with Image.open(image_file) as image:
+                                image = image.convert("RGB")
+                                yield image_name, {
+                                    "image": image,
+                                    "style": label_name,
+                                    "church_id": church_id,
+                                }
+                        else:
+                            continue
+