fix: os import and duplicate keys

Signed-off-by: Diwank Singh Tomer <diwank.singh@gmail.com>

lld.py

@@ -1,5 +1,7 @@
 """Dataset class for LLD dataset."""
 
+import os
+
 import datasets as ds
 import pandas as pd
 from sklearn.model_selection import train_test_split
@@ -43,6 +45,8 @@ class LLD(ds.GeneratorBasedBuilder):
     def _split_generators(self, dl_manager):
         # Load dataframe
         use_local = os.environ.get("USE_LOCAL")
+        print(f"local: {bool(use_local)}")
+
         archive_path = (
             "./data/lld-processed.h5" if use_local else dl_manager.download(_URL)
         )
@@ -73,8 +77,8 @@ class LLD(ds.GeneratorBasedBuilder):
         """Generate images and description splits."""
 
         for i, (desc, imgs) in enumerate(zip(description.values, images.values)):
-            for img in imgs:
-                yield i, {
+            for j, img in enumerate(imgs):
+                yield f"{i}-{j}", {
                     "image": {"bytes": img},
                     "description": desc,
                 }