Fix bug in replacing UNK.

README.md

@@ -54,16 +54,16 @@ dataset_info:
     dtype: string
   splits:
   - name: train
-    num_bytes: 963568244.882558
-    num_examples: 9373
+    num_bytes: 1014558975.36
+    num_examples: 9869
   - name: test
-    num_bytes: 95272065.14958175
-    num_examples: 1180
+    num_bytes: 106170264.135
+    num_examples: 1315
   - name: validation
-    num_bytes: 101007890.83281414
-    num_examples: 1069
-  download_size: 1208888774
-  dataset_size: 1159848200.864954
+    num_bytes: 106771606.91
+    num_examples: 1130
+  download_size: 1223500329
+  dataset_size: 1227500846.4050002
 configs:
 - config_name: 30s
   data_files:

data/test-00000-of-00001.parquet

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:b9456380e4af77de016aa99a469aafe148116837c81abc3693f74a1a8a155256
-size 103301918
+oid sha256:3e7f72a00c52bf97b23f87e6ec640c1cca7c943f1355d84e61197138ee6be821
+size 105754746

data/train-00000-of-00002.parquet

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:83af73f9cc37a66b159b32d884f8edd869a29876add92e60d8b035252afb0b08
-size 472479006
+oid sha256:f6e5c47566f3f29822f0a98461e37ec03263f9df81f1c63af909271b3983c2a1
+size 482614149

data/train-00001-of-00002.parquet

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:560306d290e7b3f44d562a7655837dfa9279a2232fb0b09371b33de03c8218b4
-size 528061782
+oid sha256:e7712e5417deb36e0ad780f663c7755e2f9aaf1a62c9842cec34c3eb66306770
+size 528614567

data/validation-00000-of-00001.parquet

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:8c4aac898373902d39a768cf425b88864951f3bdc0ffe47996b94f2e8dc65c31
-size 105046068
+oid sha256:baa0c5b1c34441edc1f487eaf365afb73b53ce844593e66f6e3799f01b4d1926
+size 106516867