chore: import upstream snapshot with attribution

decoding/GAD/fairseq/model_parallel/modules/__init__.py

@@ -0,0 +1,17 @@
+# Copyright (c) Facebook, Inc. and its affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+"""isort:skip_file"""
+
+from .multihead_attention import ModelParallelMultiheadAttention
+from .transformer_layer import (
+    ModelParallelTransformerEncoderLayer,
+    ModelParallelTransformerDecoderLayer,
+)
+
+__all__ = [
+    "ModelParallelMultiheadAttention",
+    "ModelParallelTransformerEncoderLayer",
+    "ModelParallelTransformerDecoderLayer",
+]