Update enwik8.py

enwik8.py

@@ -35,22 +35,17 @@ _URLS = {"source": "http://mattmahoney.net/dc/enwik8.zip"}
 
 class Enwik8(datasets.GeneratorBasedBuilder):
 
-    VERSION = datasets.Version("1.1.0")
+    VERSION = datasets.Version("2.0.0")
 
     BUILDER_CONFIGS = [
         datasets.BuilderConfig(
-            name="enwik8",
+            name="enwik8-standard",
             version=VERSION,
-            description="This version of the dataset contains a split by line version with all content",
-        ),
-        datasets.BuilderConfig(
-            name="enwik8-raw",
-            version=VERSION,
-            description="This version of the dataset contains a raw string version split with all content",
-        ),
+            description="This version of the dataset uses the standard split of 90M/5M/5M bytes, and yields a single text blob per split.",
+        )
     ]
 
-    DEFAULT_CONFIG_NAME = "enwik8"
+    DEFAULT_CONFIG_NAME = "enwik8-standard"
 
     def _info(self):
 
@@ -77,15 +72,31 @@ class Enwik8(datasets.GeneratorBasedBuilder):
                 gen_kwargs={
                     "filepath": os.path.join(data_dir, "enwik8"),
                     "split": "train",
+                    "start_index": 0,
+                    "end_index": 90_000_000,
+                },
+            ),
+            datasets.SplitGenerator(
+                name=datasets.Split.VALIDATION,
+                gen_kwargs={
+                    "filepath": os.path.join(data_dir, "enwik8"),
+                    "split": "validation",
+                    "start_index": 90_000_000,
+                    "end_index": 95_000_000,
+                },
+            ),
+            datasets.SplitGenerator(
+                name=datasets.Split.TEST,
+                gen_kwargs={
+                    "filepath": os.path.join(data_dir, "enwik8"),
+                    "split": "test",
+                    "start_index": 95_000_000,
+                    "end_index": 100_000_000,
                 },
             )
         ]
 
     # method parameters are unpacked from `gen_kwargs` as given in `_split_generators`
-    def _generate_examples(self, filepath, split):
+    def _generate_examples(self, filepath, split, start_index, end_index):
         with open(filepath, encoding="utf-8") as f:
-            if self.config.name.endswith("raw"):
-                yield 0, {"text": f.read()}
-            else:
-                for key, line in enumerate(f):
-                    yield key, {"text": line.strip()}
+            yield 0, {"text": f.read()[start_index:end_index]}