Create esc50.py

esc50.py

@@ -0,0 +1,84 @@
+import os
+import datasets
+import typing as tp
+from pathlib import Path
+
+SAMPLE_RATE = 44_100
+EXTENSION = '.wav'
+
+
+class ESC50(datasets.GeneratorBasedBuilder):
+    """
+    The ESC50 dataset
+    """
+    def _info(self):
+        return datasets.DatasetInfo(
+            description='Environmental sound classification dataset',
+            features=datasets.Features(
+                {
+                    # "filepath": datasets.Value("string"), 
+                    "audio": datasets.Audio(sampling_rate=SAMPLE_RATE), 
+                    "label": datasets.ClassLabel(names=GENRES), 
+                }
+            ),
+        )
+
+    def _split_generators(self, dl_manager):
+        data_dir = dl_manager.download_and_extract("ESC-50-master.zip")
+        return [
+            datasets.SplitGenerator(
+                name=datasets.Split.TRAIN, 
+                gen_kwargs={
+                    "data_dir": data_dir, 
+                    "split": 'train'
+                }, 
+            ), 
+        ]
+
+    def _generate_examples(self, data_dir, split):
+        _, _walker = fast_scandir(data_dir, [EXTENSION], recursive=True)
+
+        for idx, fileid in enumerate(_walker):
+            yield idx, {
+                # 'filepath': fileid, 
+                'audio': fileid, 
+                'fold': default_find_fold(fileid), 
+                'label': default_find_classes(fileid)
+            }
+
+
+def default_find_classes(audio_path):
+    id_ = Path(audio_path).stem.split('-')[-1]
+    return ESC50_ID2LABEL.get(int(id_))
+
+
+def default_find_fold(audio_path):
+    fold = Path(audio_path).stem.split('-')[0]
+    return int(fold)
+
+
+def fast_scandir(path: str, exts: tp.List[str], recursive: bool = False):
+    # Scan files recursively faster than glob
+    # From github.com/drscotthawley/aeiou/blob/main/aeiou/core.py
+    subfolders, files = [], []
+
+    try:  # hope to avoid 'permission denied' by this try
+        for f in os.scandir(path):
+            try:  # 'hope to avoid too many levels of symbolic links' error
+                if f.is_dir():
+                    subfolders.append(f.path)
+                elif f.is_file():
+                    if os.path.splitext(f.name)[1].lower() in exts:
+                        files.append(f.path)
+            except Exception:
+                pass
+    except Exception:
+        pass
+
+    if recursive:
+        for path in list(subfolders):
+            sf, f = fast_scandir(path, exts, recursive=recursive)
+            subfolders.extend(sf)
+            files.extend(f)  # type: ignore
+
+    return subfolders, files