Fix for remote repository (#2)

- Fix for remote repository (19c8a6421095678c86ed0f7772d7a008825c2e72)

collection3.py

@@ -28,9 +28,11 @@ Conversion to the IOB2 format and splitting into train, validation and test sets
 For more details see https://ieeexplore.ieee.org/document/7584769 and http://labinform.ru/pub/named_entities/index.htm
 """
 
-_TRAINING_FILE = "train.txt"
-_DEV_FILE = "valid.txt"
-_TEST_FILE = "test.txt"
+_URLS = {
+    "train": os.path.join("data", "train.txt"),
+    "dev": os.path.join("data", "valid.txt"),
+    "test": os.path.join("data", "test.txt"),
+}
 
 
 class Collection3(datasets.GeneratorBasedBuilder):
@@ -69,11 +71,7 @@ class Collection3(datasets.GeneratorBasedBuilder):
 
     def _split_generators(self, dl_manager):
         """Returns SplitGenerators."""
-        data_files = {
-            "train": os.path.join('data', _TRAINING_FILE),
-            "dev": os.path.join('data', _DEV_FILE),
-            "test": os.path.join('data', _TEST_FILE),
-        }
+        data_files = dl_manager.download(_URLS)
 
         return [
             datasets.SplitGenerator(name=datasets.Split.TRAIN, gen_kwargs={"filepath": data_files["train"]}),