Fix offline mode with single config

src/datasets/packaged_modules/cache/cache.py

@@ -1,4 +1,5 @@
 import glob
+import json
 import os
 import shutil
 import time
@@ -22,43 +23,62 @@ def _get_modification_time(cached_directory_path):
 
 
 def _find_hash_in_cache(
-    dataset_name: str, config_name: Optional[str], cache_dir: Optional[str]
+    dataset_name: str,
+    config_name: Optional[str],
+    cache_dir: Optional[str],
+    config_kwargs: dict,
+    custom_features: Optional[datasets.Features],
 ) -> Tuple[str, str, str]:
+    if config_name or config_kwargs or custom_features:
+        config_id = datasets.BuilderConfig(config_name or "default").create_config_id(
+            config_kwargs=config_kwargs, custom_features=custom_features
+        )
+    else:
+        config_id = None
     cache_dir = os.path.expanduser(str(cache_dir or datasets.config.HF_DATASETS_CACHE))
     cached_datasets_directory_path_root = os.path.join(cache_dir, dataset_name.replace("/", "___"))
     cached_directory_paths = [
         cached_directory_path
         for cached_directory_path in glob.glob(
-            os.path.join(cached_datasets_directory_path_root, config_name or "*", "*", "*")
+            os.path.join(cached_datasets_directory_path_root, config_id or "*", "*", "*")
         )
         if os.path.isdir(cached_directory_path)
+        and (
+            config_kwargs
+            or custom_features
+            or json.loads(Path(cached_directory_path, "dataset_info.json").read_text(encoding="utf-8"))["config_name"]
+            == Path(cached_directory_path).parts[-3]  # no extra params => config_id == config_name
+        )
     ]
     if not cached_directory_paths:
-        if config_name is not None:
-            cached_directory_paths = [
-                cached_directory_path
-                for cached_directory_path in glob.glob(
-                    os.path.join(cached_datasets_directory_path_root, "*", "*", "*")
-                )
-                if os.path.isdir(cached_directory_path)
-            ]
+        cached_directory_paths = [
+            cached_directory_path
+            for cached_directory_path in glob.glob(os.path.join(cached_datasets_directory_path_root, "*", "*", "*"))
+            if os.path.isdir(cached_directory_path)
+        ]
         available_configs = sorted(
             {Path(cached_directory_path).parts[-3] for cached_directory_path in cached_directory_paths}
         )
         raise ValueError(
             f"Couldn't find cache for {dataset_name}"
-            + (f" for config '{config_name}'" if config_name else "")
+            + (f" for config '{config_id}'" if config_id else "")
             + (f"\nAvailable configs in the cache: {available_configs}" if available_configs else "")
         )
     # get most recent
     cached_directory_path = Path(sorted(cached_directory_paths, key=_get_modification_time)[-1])
     version, hash = cached_directory_path.parts[-2:]
     other_configs = [
-        Path(cached_directory_path).parts[-3]
-        for cached_directory_path in glob.glob(os.path.join(cached_datasets_directory_path_root, "*", version, hash))
-        if os.path.isdir(cached_directory_path)
+        Path(_cached_directory_path).parts[-3]
+        for _cached_directory_path in glob.glob(os.path.join(cached_datasets_directory_path_root, "*", version, hash))
+        if os.path.isdir(_cached_directory_path)
+        and (
+            config_kwargs
+            or custom_features
+            or json.loads(Path(_cached_directory_path, "dataset_info.json").read_text(encoding="utf-8"))["config_name"]
+            == Path(_cached_directory_path).parts[-3]  # no extra params => config_id == config_name
+        )
     ]
-    if not config_name and len(other_configs) > 1:
+    if not config_id and len(other_configs) > 1:
         raise ValueError(
             f"There are multiple '{dataset_name}' configurations in the cache: {', '.join(other_configs)}"
             f"\nPlease specify which configuration to reload from the cache, e.g."
@@ -114,15 +134,12 @@ def __init__(
         if data_dir is not None:
             config_kwargs["data_dir"] = data_dir
         if hash == "auto" and version == "auto":
-            # First we try to find a folder that takes the config_kwargs into account
-            # e.g. with "default-data_dir=data%2Ffortran" as config_id
-            config_id = self.BUILDER_CONFIG_CLASS(config_name or "default").create_config_id(
-                config_kwargs=config_kwargs, custom_features=features
-            )
             config_name, version, hash = _find_hash_in_cache(
                 dataset_name=repo_id or dataset_name,
-                config_name=config_id,
+                config_name=config_name,
                 cache_dir=cache_dir,
+                config_kwargs=config_kwargs,
+                custom_features=features,
             )
         elif hash == "auto" or version == "auto":
             raise NotImplementedError("Pass both hash='auto' and version='auto' instead")

tests/packaged_modules/test_cache.py

@@ -6,40 +6,47 @@
 from datasets.packaged_modules.cache.cache import Cache
 
 
+SAMPLE_DATASET_SINGLE_CONFIG_IN_METADATA = "hf-internal-testing/audiofolder_single_config_in_metadata"
 SAMPLE_DATASET_TWO_CONFIG_IN_METADATA = "hf-internal-testing/audiofolder_two_configs_in_metadata"
 
 
-def test_cache(text_dir: Path):
-    ds = load_dataset(str(text_dir))
+def test_cache(text_dir: Path, tmp_path: Path):
+    cache_dir = tmp_path / "test_cache"
+    ds = load_dataset(str(text_dir), cache_dir=str(cache_dir))
     hash = Path(ds["train"].cache_files[0]["filename"]).parts[-2]
-    cache = Cache(dataset_name=text_dir.name, hash=hash)
+    cache = Cache(cache_dir=str(cache_dir), dataset_name=text_dir.name, hash=hash)
     reloaded = cache.as_dataset()
     assert list(ds) == list(reloaded)
     assert list(ds["train"]) == list(reloaded["train"])
 
 
-def test_cache_streaming(text_dir: Path):
-    ds = load_dataset(str(text_dir))
+def test_cache_streaming(text_dir: Path, tmp_path: Path):
+    cache_dir = tmp_path / "test_cache_streaming"
+    ds = load_dataset(str(text_dir), cache_dir=str(cache_dir))
     hash = Path(ds["train"].cache_files[0]["filename"]).parts[-2]
-    cache = Cache(dataset_name=text_dir.name, hash=hash)
+    cache = Cache(cache_dir=str(cache_dir), dataset_name=text_dir.name, hash=hash)
     reloaded = cache.as_streaming_dataset()
     assert list(ds) == list(reloaded)
     assert list(ds["train"]) == list(reloaded["train"])
 
 
-def test_cache_auto_hash(text_dir: Path):
-    ds = load_dataset(str(text_dir))
-    cache = Cache(dataset_name=text_dir.name, version="auto", hash="auto")
+def test_cache_auto_hash(text_dir: Path, tmp_path: Path):
+    cache_dir = tmp_path / "test_cache_auto_hash"
+    ds = load_dataset(str(text_dir), cache_dir=str(cache_dir))
+    cache = Cache(cache_dir=str(cache_dir), dataset_name=text_dir.name, version="auto", hash="auto")
     reloaded = cache.as_dataset()
     assert list(ds) == list(reloaded)
     assert list(ds["train"]) == list(reloaded["train"])
 
 
-def test_cache_auto_hash_with_custom_config(text_dir: Path):
-    ds = load_dataset(str(text_dir), sample_by="paragraph")
-    another_ds = load_dataset(str(text_dir))
-    cache = Cache(dataset_name=text_dir.name, version="auto", hash="auto", sample_by="paragraph")
-    another_cache = Cache(dataset_name=text_dir.name, version="auto", hash="auto")
+def test_cache_auto_hash_with_custom_config(text_dir: Path, tmp_path: Path):
+    cache_dir = tmp_path / "test_cache_auto_hash_with_custom_config"
+    ds = load_dataset(str(text_dir), sample_by="paragraph", cache_dir=str(cache_dir))
+    another_ds = load_dataset(str(text_dir), cache_dir=str(cache_dir))
+    cache = Cache(
+        cache_dir=str(cache_dir), dataset_name=text_dir.name, version="auto", hash="auto", sample_by="paragraph"
+    )
+    another_cache = Cache(cache_dir=str(cache_dir), dataset_name=text_dir.name, version="auto", hash="auto")
     assert cache.config_id.endswith("paragraph")
     assert not another_cache.config_id.endswith("paragraph")
     reloaded = cache.as_dataset()
@@ -50,27 +57,79 @@ def test_cache_auto_hash_with_custom_config(text_dir: Path):
     assert list(another_ds["train"]) == list(another_reloaded["train"])
 
 
-def test_cache_missing(text_dir: Path):
-    load_dataset(str(text_dir))
-    Cache(dataset_name=text_dir.name, version="auto", hash="auto").download_and_prepare()
+def test_cache_missing(text_dir: Path, tmp_path: Path):
+    cache_dir = tmp_path / "test_cache_missing"
+    load_dataset(str(text_dir), cache_dir=str(cache_dir))
+    Cache(cache_dir=str(cache_dir), dataset_name=text_dir.name, version="auto", hash="auto").download_and_prepare()
     with pytest.raises(ValueError):
-        Cache(dataset_name="missing", version="auto", hash="auto").download_and_prepare()
+        Cache(cache_dir=str(cache_dir), dataset_name="missing", version="auto", hash="auto").download_and_prepare()
     with pytest.raises(ValueError):
-        Cache(dataset_name=text_dir.name, hash="missing").download_and_prepare()
+        Cache(cache_dir=str(cache_dir), dataset_name=text_dir.name, hash="missing").download_and_prepare()
     with pytest.raises(ValueError):
-        Cache(dataset_name=text_dir.name, config_name="missing", version="auto", hash="auto").download_and_prepare()
+        Cache(
+            cache_dir=str(cache_dir), dataset_name=text_dir.name, config_name="missing", version="auto", hash="auto"
+        ).download_and_prepare()
 
 
 @pytest.mark.integration
-def test_cache_multi_configs():
+def test_cache_multi_configs(tmp_path: Path):
+    cache_dir = tmp_path / "test_cache_multi_configs"
     repo_id = SAMPLE_DATASET_TWO_CONFIG_IN_METADATA
     dataset_name = repo_id.split("/")[-1]
     config_name = "v1"
-    ds = load_dataset(repo_id, config_name)
-    cache = Cache(dataset_name=dataset_name, repo_id=repo_id, config_name=config_name, version="auto", hash="auto")
+    ds = load_dataset(repo_id, config_name, cache_dir=str(cache_dir))
+    cache = Cache(
+        cache_dir=str(cache_dir),
+        dataset_name=dataset_name,
+        repo_id=repo_id,
+        config_name=config_name,
+        version="auto",
+        hash="auto",
+    )
     reloaded = cache.as_dataset()
     assert list(ds) == list(reloaded)
     assert len(ds["train"]) == len(reloaded["train"])
     with pytest.raises(ValueError) as excinfo:
-        Cache(dataset_name=dataset_name, repo_id=repo_id, config_name="missing", version="auto", hash="auto")
+        Cache(
+            cache_dir=str(cache_dir),
+            dataset_name=dataset_name,
+            repo_id=repo_id,
+            config_name="missing",
+            version="auto",
+            hash="auto",
+        )
+    assert config_name in str(excinfo.value)
+
+
+@pytest.mark.integration
+def test_cache_single_config(tmp_path: Path):
+    cache_dir = tmp_path / "test_cache_single_config"
+    repo_id = SAMPLE_DATASET_SINGLE_CONFIG_IN_METADATA
+    dataset_name = repo_id.split("/")[-1]
+    config_name = "custom"
+    ds = load_dataset(repo_id, cache_dir=str(cache_dir))
+    cache = Cache(cache_dir=str(cache_dir), dataset_name=dataset_name, repo_id=repo_id, version="auto", hash="auto")
+    reloaded = cache.as_dataset()
+    assert list(ds) == list(reloaded)
+    assert len(ds["train"]) == len(reloaded["train"])
+    cache = Cache(
+        cache_dir=str(cache_dir),
+        dataset_name=dataset_name,
+        config_name=config_name,
+        repo_id=repo_id,
+        version="auto",
+        hash="auto",
+    )
+    reloaded = cache.as_dataset()
+    assert list(ds) == list(reloaded)
+    assert len(ds["train"]) == len(reloaded["train"])
+    with pytest.raises(ValueError) as excinfo:
+        Cache(
+            cache_dir=str(cache_dir),
+            dataset_name=dataset_name,
+            repo_id=repo_id,
+            config_name="missing",
+            version="auto",
+            hash="auto",
+        )
     assert config_name in str(excinfo.value)