Rename 10K example split to validation

.gitattributes

@@ -73,3 +73,4 @@ crossdock/crossdocked_v1.0_rmsd_1_to_2_all_heavy_pocket_valid_3000.lmdb filter=l
 pockets_center_frame_cartesian/train.lmdb filter=lfs diff=lfs merge=lfs -text
 pockets_center_frame_cartesian/valid.lmdb filter=lfs diff=lfs merge=lfs -text
 ligands/example_10000.lmdb filter=lfs diff=lfs merge=lfs -text
+ligands/valid.lmdb filter=lfs diff=lfs merge=lfs -text

README.md

@@ -42,8 +42,8 @@ ligands/shard_1_metadata.json
 ...
 ligands/shard_5.lmdb
 ligands/shard_5_metadata.json
-ligands/example_10000.lmdb
-ligands/example_10000_metadata.json
+ligands/valid.lmdb
+ligands/valid_metadata.json
 ```
 
 Every `shard_*.lmdb` stores numeric keys `b"0"` through `b"19999999"` and a
@@ -52,7 +52,7 @@ pickled `b"length"` value equal to `20_000_000`.
 The local deduplication registries used during generation are not uploaded;
 they are not needed to train from the finalized records.
 
-`example_10000.lmdb` uses the same record schema and contains 10,000 unique
+`valid.lmdb` uses the same record schema and contains 10,000 unique
 SELFIES generated from unused source slice 6. All 10,000 entries were checked
 against the finalized training registries and have no overlap with the 100M
 training records. Its numeric keys are `b"0"` through `b"9999"`, and its