chore: import upstream snapshot with attribution

decoding/GAD/scripts/spm_train.py

@@ -0,0 +1,16 @@
+#!/usr/bin/env python
+# Copyright (c) Facebook, Inc. and its affiliates.
+# All rights reserved.
+#
+# This source code is licensed under the license found in the
+# LICENSE file in the root directory of this source tree.
+
+from __future__ import absolute_import, division, print_function, unicode_literals
+
+import sys
+
+import sentencepiece as spm
+
+
+if __name__ == "__main__":
+    spm.SentencePieceTrainer.Train(" ".join(sys.argv[1:]))