From 1043ff6d68428232c6d46891eb5b470e75ca5506 Mon Sep 17 00:00:00 2001
From: Lu Fang <lufang@fb.com>
Date: Thu, 7 Mar 2019 10:51:29 -0800
Subject: [PATCH] Set the default ONNX opset to the latest stable opset (i.e.,
 9) (#17736)

Summary:
1) The changes in the new opset won't affect internal pipeline.
2) The CI won't be affected by the ONNX changes.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/17736

Reviewed By: zrphercule

Differential Revision: D14358710

Pulled By: houseroad

fbshipit-source-id: 4ef15d2246b50f6875ee215ce37ecf92d555ca6a
---
 test/onnx/expect/TestOperators.test_acos.expect                   | 2 +-
 test/onnx/expect/TestOperators.test_add_broadcast.expect          | 2 +-
 test/onnx/expect/TestOperators.test_add_left_broadcast.expect     | 2 +-
 test/onnx/expect/TestOperators.test_add_size1_broadcast.expect    | 2 +-
 .../expect/TestOperators.test_add_size1_right_broadcast.expect    | 2 +-
 .../TestOperators.test_add_size1_singleton_broadcast.expect       | 2 +-
 test/onnx/expect/TestOperators.test_addconstant.expect            | 2 +-
 test/onnx/expect/TestOperators.test_addmm.expect                  | 2 +-
 test/onnx/expect/TestOperators.test_argmax.expect                 | 2 +-
 test/onnx/expect/TestOperators.test_asin.expect                   | 2 +-
 test/onnx/expect/TestOperators.test_at_op.expect                  | 2 +-
 test/onnx/expect/TestOperators.test_atan.expect                   | 2 +-
 test/onnx/expect/TestOperators.test_basic.expect                  | 2 +-
 test/onnx/expect/TestOperators.test_batchnorm.expect              | 2 +-
 test/onnx/expect/TestOperators.test_batchnorm_1d.expect           | 2 +-
 test/onnx/expect/TestOperators.test_batchnorm_noaffine.expect     | 2 +-
 test/onnx/expect/TestOperators.test_batchnorm_training.expect     | 2 +-
 test/onnx/expect/TestOperators.test_chunk.expect                  | 2 +-
 test/onnx/expect/TestOperators.test_clip.expect                   | 2 +-
 test/onnx/expect/TestOperators.test_clip_max.expect               | 2 +-
 test/onnx/expect/TestOperators.test_clip_min.expect               | 2 +-
 test/onnx/expect/TestOperators.test_concat2.expect                | 2 +-
 test/onnx/expect/TestOperators.test_conv.expect                   | 2 +-
 test/onnx/expect/TestOperators.test_convtranspose.expect          | 2 +-
 test/onnx/expect/TestOperators.test_cos.expect                    | 2 +-
 test/onnx/expect/TestOperators.test_dropout.expect                | 2 +-
 test/onnx/expect/TestOperators.test_elu.expect                    | 2 +-
 test/onnx/expect/TestOperators.test_embedding_bags.expect         | 2 +-
 test/onnx/expect/TestOperators.test_equal.expect                  | 2 +-
 test/onnx/expect/TestOperators.test_erf.expect                    | 2 +-
 test/onnx/expect/TestOperators.test_exp.expect                    | 2 +-
 test/onnx/expect/TestOperators.test_expand.expect                 | 2 +-
 test/onnx/expect/TestOperators.test_flatten.expect                | 2 +-
 test/onnx/expect/TestOperators.test_flatten2D.expect              | 2 +-
 test/onnx/expect/TestOperators.test_full.expect                   | 2 +-
 test/onnx/expect/TestOperators.test_full_like.expect              | 2 +-
 test/onnx/expect/TestOperators.test_ge.expect                     | 2 +-
 test/onnx/expect/TestOperators.test_gt.expect                     | 2 +-
 test/onnx/expect/TestOperators.test_hardtanh.expect               | 2 +-
 test/onnx/expect/TestOperators.test_implicit_expand.expect        | 2 +-
 test/onnx/expect/TestOperators.test_index.expect                  | 2 +-
 test/onnx/expect/TestOperators.test_le.expect                     | 2 +-
 test/onnx/expect/TestOperators.test_linear.expect                 | 2 +-
 test/onnx/expect/TestOperators.test_log_sigmoid.expect            | 2 +-
 test/onnx/expect/TestOperators.test_logsoftmax.expect             | 2 +-
 test/onnx/expect/TestOperators.test_lt.expect                     | 2 +-
 ...stable_opset.expect => TestOperators.test_master_opset.expect} | 2 +-
 test/onnx/expect/TestOperators.test_max.expect                    | 2 +-
 test/onnx/expect/TestOperators.test_maxpool.expect                | 2 +-
 test/onnx/expect/TestOperators.test_maxpool_indices.expect        | 2 +-
 test/onnx/expect/TestOperators.test_mean.expect                   | 2 +-
 test/onnx/expect/TestOperators.test_min.expect                    | 2 +-
 test/onnx/expect/TestOperators.test_mm.expect                     | 2 +-
 test/onnx/expect/TestOperators.test_ne.expect                     | 2 +-
 test/onnx/expect/TestOperators.test_nonzero.expect                | 2 +-
 test/onnx/expect/TestOperators.test_norm.expect                   | 2 +-
 test/onnx/expect/TestOperators.test_ones_like.expect              | 2 +-
 test/onnx/expect/TestOperators.test_pad.expect                    | 2 +-
 test/onnx/expect/TestOperators.test_params.expect                 | 2 +-
 test/onnx/expect/TestOperators.test_permute2.expect               | 2 +-
 test/onnx/expect/TestOperators.test_pow.expect                    | 2 +-
 test/onnx/expect/TestOperators.test_prod.expect                   | 2 +-
 test/onnx/expect/TestOperators.test_randn.expect                  | 2 +-
 .../expect/TestOperators.test_reduce_sum_negative_indices.expect  | 2 +-
 test/onnx/expect/TestOperators.test_reduced_mean.expect           | 2 +-
 test/onnx/expect/TestOperators.test_reduced_mean_keepdim.expect   | 2 +-
 test/onnx/expect/TestOperators.test_reduced_prod.expect           | 2 +-
 test/onnx/expect/TestOperators.test_reduced_prod_keepdim.expect   | 2 +-
 test/onnx/expect/TestOperators.test_reduced_sum.expect            | 2 +-
 test/onnx/expect/TestOperators.test_reduced_sum_keepdim.expect    | 2 +-
 test/onnx/expect/TestOperators.test_reducemax.expect              | 2 +-
 test/onnx/expect/TestOperators.test_reducemin.expect              | 2 +-
 test/onnx/expect/TestOperators.test_repeat.expect                 | 2 +-
 test/onnx/expect/TestOperators.test_repeat_dim_overflow.expect    | 2 +-
 test/onnx/expect/TestOperators.test_rrelu.expect                  | 2 +-
 test/onnx/expect/TestOperators.test_rsub.expect                   | 2 +-
 test/onnx/expect/TestOperators.test_selu.expect                   | 2 +-
 test/onnx/expect/TestOperators.test_sin.expect                    | 2 +-
 test/onnx/expect/TestOperators.test_slice.expect                  | 2 +-
 test/onnx/expect/TestOperators.test_split.expect                  | 2 +-
 test/onnx/expect/TestOperators.test_split_with_sizes.expect       | 2 +-
 test/onnx/expect/TestOperators.test_sqrt.expect                   | 2 +-
 test/onnx/expect/TestOperators.test_sum.expect                    | 2 +-
 test/onnx/expect/TestOperators.test_tan.expect                    | 2 +-
 test/onnx/expect/TestOperators.test_transpose.expect              | 2 +-
 test/onnx/expect/TestOperators.test_type_as.expect                | 2 +-
 test/onnx/expect/TestOperators.test_unsqueeze.expect              | 2 +-
 test/onnx/expect/TestOperators.test_view.expect                   | 2 +-
 test/onnx/expect/TestOperators.test_view_flatten.expect           | 2 +-
 test/onnx/expect/TestOperators.test_zeros_like.expect             | 2 +-
 test/onnx/test_operators.py                                       | 4 ++--
 torch/onnx/symbolic.py                                            | 8 +++++---
 torch/onnx/utils.py                                               | 4 +++-
 93 files changed, 100 insertions(+), 96 deletions(-)
 rename test/onnx/expect/{TestOperators.test_stable_opset.expect => TestOperators.test_master_opset.expect} (98%)

diff --git a/test/onnx/expect/TestOperators.test_acos.expect b/test/onnx/expect/TestOperators.test_acos.expect
index 3f50055..129fb56 100644
--- a/test/onnx/expect/TestOperators.test_acos.expect
+++ b/test/onnx/expect/TestOperators.test_acos.expect
@@ -42,5 +42,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_add_broadcast.expect b/test/onnx/expect/TestOperators.test_add_broadcast.expect
index d21f68b..77727a5 100644
--- a/test/onnx/expect/TestOperators.test_add_broadcast.expect
+++ b/test/onnx/expect/TestOperators.test_add_broadcast.expect
@@ -56,5 +56,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_add_left_broadcast.expect b/test/onnx/expect/TestOperators.test_add_left_broadcast.expect
index b7878a4..558f2ab 100644
--- a/test/onnx/expect/TestOperators.test_add_left_broadcast.expect
+++ b/test/onnx/expect/TestOperators.test_add_left_broadcast.expect
@@ -56,5 +56,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_add_size1_broadcast.expect b/test/onnx/expect/TestOperators.test_add_size1_broadcast.expect
index aa43174..47f1a29 100644
--- a/test/onnx/expect/TestOperators.test_add_size1_broadcast.expect
+++ b/test/onnx/expect/TestOperators.test_add_size1_broadcast.expect
@@ -59,5 +59,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_add_size1_right_broadcast.expect b/test/onnx/expect/TestOperators.test_add_size1_right_broadcast.expect
index d21f68b..77727a5 100644
--- a/test/onnx/expect/TestOperators.test_add_size1_right_broadcast.expect
+++ b/test/onnx/expect/TestOperators.test_add_size1_right_broadcast.expect
@@ -56,5 +56,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_add_size1_singleton_broadcast.expect b/test/onnx/expect/TestOperators.test_add_size1_singleton_broadcast.expect
index ddc8b1b..f32b7d2 100644
--- a/test/onnx/expect/TestOperators.test_add_size1_singleton_broadcast.expect
+++ b/test/onnx/expect/TestOperators.test_add_size1_singleton_broadcast.expect
@@ -59,5 +59,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_addconstant.expect b/test/onnx/expect/TestOperators.test_addconstant.expect
index c02268d..4bff59b 100644
--- a/test/onnx/expect/TestOperators.test_addconstant.expect
+++ b/test/onnx/expect/TestOperators.test_addconstant.expect
@@ -55,5 +55,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_addmm.expect b/test/onnx/expect/TestOperators.test_addmm.expect
index c27d4d9..63145e7 100644
--- a/test/onnx/expect/TestOperators.test_addmm.expect
+++ b/test/onnx/expect/TestOperators.test_addmm.expect
@@ -100,5 +100,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_argmax.expect b/test/onnx/expect/TestOperators.test_argmax.expect
index efe6eb9..96e6532 100644
--- a/test/onnx/expect/TestOperators.test_argmax.expect
+++ b/test/onnx/expect/TestOperators.test_argmax.expect
@@ -49,5 +49,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_asin.expect b/test/onnx/expect/TestOperators.test_asin.expect
index d9f2369..0ce924b 100644
--- a/test/onnx/expect/TestOperators.test_asin.expect
+++ b/test/onnx/expect/TestOperators.test_asin.expect
@@ -42,5 +42,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_at_op.expect b/test/onnx/expect/TestOperators.test_at_op.expect
index 6a5f6c1..58672ec 100644
--- a/test/onnx/expect/TestOperators.test_at_op.expect
+++ b/test/onnx/expect/TestOperators.test_at_op.expect
@@ -48,5 +48,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_atan.expect b/test/onnx/expect/TestOperators.test_atan.expect
index d3d0fbd..d214ece 100644
--- a/test/onnx/expect/TestOperators.test_atan.expect
+++ b/test/onnx/expect/TestOperators.test_atan.expect
@@ -42,5 +42,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_basic.expect b/test/onnx/expect/TestOperators.test_basic.expect
index 8b257cf..1048b5c 100644
--- a/test/onnx/expect/TestOperators.test_basic.expect
+++ b/test/onnx/expect/TestOperators.test_basic.expect
@@ -71,5 +71,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_batchnorm.expect b/test/onnx/expect/TestOperators.test_batchnorm.expect
index 77f6e6e..da13303 100644
--- a/test/onnx/expect/TestOperators.test_batchnorm.expect
+++ b/test/onnx/expect/TestOperators.test_batchnorm.expect
@@ -159,5 +159,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_batchnorm_1d.expect b/test/onnx/expect/TestOperators.test_batchnorm_1d.expect
index 193a3b8..bd66622 100644
--- a/test/onnx/expect/TestOperators.test_batchnorm_1d.expect
+++ b/test/onnx/expect/TestOperators.test_batchnorm_1d.expect
@@ -167,5 +167,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_batchnorm_noaffine.expect b/test/onnx/expect/TestOperators.test_batchnorm_noaffine.expect
index 6495868..787db9b 100644
--- a/test/onnx/expect/TestOperators.test_batchnorm_noaffine.expect
+++ b/test/onnx/expect/TestOperators.test_batchnorm_noaffine.expect
@@ -147,5 +147,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_batchnorm_training.expect b/test/onnx/expect/TestOperators.test_batchnorm_training.expect
index 55cd830..92c983c 100644
--- a/test/onnx/expect/TestOperators.test_batchnorm_training.expect
+++ b/test/onnx/expect/TestOperators.test_batchnorm_training.expect
@@ -163,5 +163,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_chunk.expect b/test/onnx/expect/TestOperators.test_chunk.expect
index 801662e..6cfe6e0 100644
--- a/test/onnx/expect/TestOperators.test_chunk.expect
+++ b/test/onnx/expect/TestOperators.test_chunk.expect
@@ -61,5 +61,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_clip.expect b/test/onnx/expect/TestOperators.test_clip.expect
index cddd05a..ae6b886 100644
--- a/test/onnx/expect/TestOperators.test_clip.expect
+++ b/test/onnx/expect/TestOperators.test_clip.expect
@@ -52,5 +52,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_clip_max.expect b/test/onnx/expect/TestOperators.test_clip_max.expect
index a8a8025..c17e330 100644
--- a/test/onnx/expect/TestOperators.test_clip_max.expect
+++ b/test/onnx/expect/TestOperators.test_clip_max.expect
@@ -59,5 +59,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_clip_min.expect b/test/onnx/expect/TestOperators.test_clip_min.expect
index 5c80dbc..7f330c1 100644
--- a/test/onnx/expect/TestOperators.test_clip_min.expect
+++ b/test/onnx/expect/TestOperators.test_clip_min.expect
@@ -59,5 +59,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_concat2.expect b/test/onnx/expect/TestOperators.test_concat2.expect
index d83e9d1..d9dd3a7 100644
--- a/test/onnx/expect/TestOperators.test_concat2.expect
+++ b/test/onnx/expect/TestOperators.test_concat2.expect
@@ -64,5 +64,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_conv.expect b/test/onnx/expect/TestOperators.test_conv.expect
index 57d9432..f9121b6 100644
--- a/test/onnx/expect/TestOperators.test_conv.expect
+++ b/test/onnx/expect/TestOperators.test_conv.expect
@@ -117,5 +117,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_convtranspose.expect b/test/onnx/expect/TestOperators.test_convtranspose.expect
index 618cc5a..1c2bcfc 100644
--- a/test/onnx/expect/TestOperators.test_convtranspose.expect
+++ b/test/onnx/expect/TestOperators.test_convtranspose.expect
@@ -123,5 +123,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_cos.expect b/test/onnx/expect/TestOperators.test_cos.expect
index b2cbfc5..6af6dd7 100644
--- a/test/onnx/expect/TestOperators.test_cos.expect
+++ b/test/onnx/expect/TestOperators.test_cos.expect
@@ -42,5 +42,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_dropout.expect b/test/onnx/expect/TestOperators.test_dropout.expect
index 0f6a55c..262bdaa 100644
--- a/test/onnx/expect/TestOperators.test_dropout.expect
+++ b/test/onnx/expect/TestOperators.test_dropout.expect
@@ -41,5 +41,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_elu.expect b/test/onnx/expect/TestOperators.test_elu.expect
index b7dc0cf..9348966 100644
--- a/test/onnx/expect/TestOperators.test_elu.expect
+++ b/test/onnx/expect/TestOperators.test_elu.expect
@@ -59,5 +59,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_embedding_bags.expect b/test/onnx/expect/TestOperators.test_embedding_bags.expect
index 60a3d9b..ffa59ff 100644
--- a/test/onnx/expect/TestOperators.test_embedding_bags.expect
+++ b/test/onnx/expect/TestOperators.test_embedding_bags.expect
@@ -100,5 +100,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_equal.expect b/test/onnx/expect/TestOperators.test_equal.expect
index ea3c205..9d6c1be 100644
--- a/test/onnx/expect/TestOperators.test_equal.expect
+++ b/test/onnx/expect/TestOperators.test_equal.expect
@@ -81,5 +81,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_erf.expect b/test/onnx/expect/TestOperators.test_erf.expect
index 921cdfb..69ebbbf 100644
--- a/test/onnx/expect/TestOperators.test_erf.expect
+++ b/test/onnx/expect/TestOperators.test_erf.expect
@@ -54,5 +54,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_exp.expect b/test/onnx/expect/TestOperators.test_exp.expect
index f701724..773277e 100644
--- a/test/onnx/expect/TestOperators.test_exp.expect
+++ b/test/onnx/expect/TestOperators.test_exp.expect
@@ -42,5 +42,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_expand.expect b/test/onnx/expect/TestOperators.test_expand.expect
index b9a2735..7646a64 100644
--- a/test/onnx/expect/TestOperators.test_expand.expect
+++ b/test/onnx/expect/TestOperators.test_expand.expect
@@ -59,5 +59,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_flatten.expect b/test/onnx/expect/TestOperators.test_flatten.expect
index 5b82b5a..1102a94 100644
--- a/test/onnx/expect/TestOperators.test_flatten.expect
+++ b/test/onnx/expect/TestOperators.test_flatten.expect
@@ -59,5 +59,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_flatten2D.expect b/test/onnx/expect/TestOperators.test_flatten2D.expect
index c41d82a..0270a2f 100644
--- a/test/onnx/expect/TestOperators.test_flatten2D.expect
+++ b/test/onnx/expect/TestOperators.test_flatten2D.expect
@@ -53,5 +53,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_full.expect b/test/onnx/expect/TestOperators.test_full.expect
index 71640c6..5737a1c 100644
--- a/test/onnx/expect/TestOperators.test_full.expect
+++ b/test/onnx/expect/TestOperators.test_full.expect
@@ -137,5 +137,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_full_like.expect b/test/onnx/expect/TestOperators.test_full_like.expect
index f5f6e4a..f6edcde 100644
--- a/test/onnx/expect/TestOperators.test_full_like.expect
+++ b/test/onnx/expect/TestOperators.test_full_like.expect
@@ -55,5 +55,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_ge.expect b/test/onnx/expect/TestOperators.test_ge.expect
index 2573c4b..d68aa4c 100644
--- a/test/onnx/expect/TestOperators.test_ge.expect
+++ b/test/onnx/expect/TestOperators.test_ge.expect
@@ -74,5 +74,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_gt.expect b/test/onnx/expect/TestOperators.test_gt.expect
index 3aa9412..4c5335c 100644
--- a/test/onnx/expect/TestOperators.test_gt.expect
+++ b/test/onnx/expect/TestOperators.test_gt.expect
@@ -81,5 +81,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_hardtanh.expect b/test/onnx/expect/TestOperators.test_hardtanh.expect
index 0544ae0..7888875 100644
--- a/test/onnx/expect/TestOperators.test_hardtanh.expect
+++ b/test/onnx/expect/TestOperators.test_hardtanh.expect
@@ -52,5 +52,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_implicit_expand.expect b/test/onnx/expect/TestOperators.test_implicit_expand.expect
index fe8ec48..02e6baf 100644
--- a/test/onnx/expect/TestOperators.test_implicit_expand.expect
+++ b/test/onnx/expect/TestOperators.test_implicit_expand.expect
@@ -55,5 +55,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_index.expect b/test/onnx/expect/TestOperators.test_index.expect
index 7bc0c23..8ebe92d 100644
--- a/test/onnx/expect/TestOperators.test_index.expect
+++ b/test/onnx/expect/TestOperators.test_index.expect
@@ -57,5 +57,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_le.expect b/test/onnx/expect/TestOperators.test_le.expect
index 584b49a..30c1a3c 100644
--- a/test/onnx/expect/TestOperators.test_le.expect
+++ b/test/onnx/expect/TestOperators.test_le.expect
@@ -74,5 +74,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_linear.expect b/test/onnx/expect/TestOperators.test_linear.expect
index d383b66..ca3d9b6 100644
--- a/test/onnx/expect/TestOperators.test_linear.expect
+++ b/test/onnx/expect/TestOperators.test_linear.expect
@@ -101,5 +101,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_log_sigmoid.expect b/test/onnx/expect/TestOperators.test_log_sigmoid.expect
index 0251c32..4e691b5 100644
--- a/test/onnx/expect/TestOperators.test_log_sigmoid.expect
+++ b/test/onnx/expect/TestOperators.test_log_sigmoid.expect
@@ -59,5 +59,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_logsoftmax.expect b/test/onnx/expect/TestOperators.test_logsoftmax.expect
index 77607e8..e2494bc 100644
--- a/test/onnx/expect/TestOperators.test_logsoftmax.expect
+++ b/test/onnx/expect/TestOperators.test_logsoftmax.expect
@@ -59,5 +59,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_lt.expect b/test/onnx/expect/TestOperators.test_lt.expect
index ea45778..f9d4aa6 100644
--- a/test/onnx/expect/TestOperators.test_lt.expect
+++ b/test/onnx/expect/TestOperators.test_lt.expect
@@ -81,5 +81,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_stable_opset.expect b/test/onnx/expect/TestOperators.test_master_opset.expect
similarity index 98%
rename from test/onnx/expect/TestOperators.test_stable_opset.expect
rename to test/onnx/expect/TestOperators.test_master_opset.expect
index b92cb3b..c37b34d 100644
--- a/test/onnx/expect/TestOperators.test_stable_opset.expect
+++ b/test/onnx/expect/TestOperators.test_master_opset.expect
@@ -59,5 +59,5 @@ graph {
   }
 }
 opset_import {
-  version: 9
+  version: 10
 }
diff --git a/test/onnx/expect/TestOperators.test_max.expect b/test/onnx/expect/TestOperators.test_max.expect
index 65cc0d5..3b305a7 100644
--- a/test/onnx/expect/TestOperators.test_max.expect
+++ b/test/onnx/expect/TestOperators.test_max.expect
@@ -59,5 +59,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_maxpool.expect b/test/onnx/expect/TestOperators.test_maxpool.expect
index 3481e37..1f359a6 100644
--- a/test/onnx/expect/TestOperators.test_maxpool.expect
+++ b/test/onnx/expect/TestOperators.test_maxpool.expect
@@ -64,5 +64,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_maxpool_indices.expect b/test/onnx/expect/TestOperators.test_maxpool_indices.expect
index a635a75..ef154b8 100644
--- a/test/onnx/expect/TestOperators.test_maxpool_indices.expect
+++ b/test/onnx/expect/TestOperators.test_maxpool_indices.expect
@@ -126,5 +126,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_mean.expect b/test/onnx/expect/TestOperators.test_mean.expect
index d7c1064..791d581 100644
--- a/test/onnx/expect/TestOperators.test_mean.expect
+++ b/test/onnx/expect/TestOperators.test_mean.expect
@@ -47,5 +47,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_min.expect b/test/onnx/expect/TestOperators.test_min.expect
index cebb894..4996812 100644
--- a/test/onnx/expect/TestOperators.test_min.expect
+++ b/test/onnx/expect/TestOperators.test_min.expect
@@ -59,5 +59,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_mm.expect b/test/onnx/expect/TestOperators.test_mm.expect
index c333b5b..9fbc32b 100644
--- a/test/onnx/expect/TestOperators.test_mm.expect
+++ b/test/onnx/expect/TestOperators.test_mm.expect
@@ -83,5 +83,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_ne.expect b/test/onnx/expect/TestOperators.test_ne.expect
index 57d1c04..6a1aa4b 100644
--- a/test/onnx/expect/TestOperators.test_ne.expect
+++ b/test/onnx/expect/TestOperators.test_ne.expect
@@ -86,5 +86,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_nonzero.expect b/test/onnx/expect/TestOperators.test_nonzero.expect
index 4e9cfd2..d5bd735 100644
--- a/test/onnx/expect/TestOperators.test_nonzero.expect
+++ b/test/onnx/expect/TestOperators.test_nonzero.expect
@@ -45,5 +45,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_norm.expect b/test/onnx/expect/TestOperators.test_norm.expect
index 12e6cd6..5fc2454 100644
--- a/test/onnx/expect/TestOperators.test_norm.expect
+++ b/test/onnx/expect/TestOperators.test_norm.expect
@@ -61,5 +61,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_ones_like.expect b/test/onnx/expect/TestOperators.test_ones_like.expect
index a36b3d5..70394a8 100644
--- a/test/onnx/expect/TestOperators.test_ones_like.expect
+++ b/test/onnx/expect/TestOperators.test_ones_like.expect
@@ -55,5 +55,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_pad.expect b/test/onnx/expect/TestOperators.test_pad.expect
index a422160..60e1f2c 100644
--- a/test/onnx/expect/TestOperators.test_pad.expect
+++ b/test/onnx/expect/TestOperators.test_pad.expect
@@ -71,5 +71,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_params.expect b/test/onnx/expect/TestOperators.test_params.expect
index b50314f..bfd11ff 100644
--- a/test/onnx/expect/TestOperators.test_params.expect
+++ b/test/onnx/expect/TestOperators.test_params.expect
@@ -87,5 +87,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_permute2.expect b/test/onnx/expect/TestOperators.test_permute2.expect
index 30aca40..310ad4b 100644
--- a/test/onnx/expect/TestOperators.test_permute2.expect
+++ b/test/onnx/expect/TestOperators.test_permute2.expect
@@ -76,5 +76,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_pow.expect b/test/onnx/expect/TestOperators.test_pow.expect
index e2351b7..ef64d11 100644
--- a/test/onnx/expect/TestOperators.test_pow.expect
+++ b/test/onnx/expect/TestOperators.test_pow.expect
@@ -77,5 +77,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_prod.expect b/test/onnx/expect/TestOperators.test_prod.expect
index c87851a..a42ef92 100644
--- a/test/onnx/expect/TestOperators.test_prod.expect
+++ b/test/onnx/expect/TestOperators.test_prod.expect
@@ -47,5 +47,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_randn.expect b/test/onnx/expect/TestOperators.test_randn.expect
index eae7624..cd1f2d0 100644
--- a/test/onnx/expect/TestOperators.test_randn.expect
+++ b/test/onnx/expect/TestOperators.test_randn.expect
@@ -67,5 +67,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_reduce_sum_negative_indices.expect b/test/onnx/expect/TestOperators.test_reduce_sum_negative_indices.expect
index c41e396..4a3909c 100644
--- a/test/onnx/expect/TestOperators.test_reduce_sum_negative_indices.expect
+++ b/test/onnx/expect/TestOperators.test_reduce_sum_negative_indices.expect
@@ -49,5 +49,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_reduced_mean.expect b/test/onnx/expect/TestOperators.test_reduced_mean.expect
index 78768bc..faed3da 100644
--- a/test/onnx/expect/TestOperators.test_reduced_mean.expect
+++ b/test/onnx/expect/TestOperators.test_reduced_mean.expect
@@ -61,5 +61,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_reduced_mean_keepdim.expect b/test/onnx/expect/TestOperators.test_reduced_mean_keepdim.expect
index e2fc4e4..5de3fef 100644
--- a/test/onnx/expect/TestOperators.test_reduced_mean_keepdim.expect
+++ b/test/onnx/expect/TestOperators.test_reduced_mean_keepdim.expect
@@ -64,5 +64,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_reduced_prod.expect b/test/onnx/expect/TestOperators.test_reduced_prod.expect
index e2bfebf..5dfd5de 100644
--- a/test/onnx/expect/TestOperators.test_reduced_prod.expect
+++ b/test/onnx/expect/TestOperators.test_reduced_prod.expect
@@ -61,5 +61,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_reduced_prod_keepdim.expect b/test/onnx/expect/TestOperators.test_reduced_prod_keepdim.expect
index 931448b..65a6ef1 100644
--- a/test/onnx/expect/TestOperators.test_reduced_prod_keepdim.expect
+++ b/test/onnx/expect/TestOperators.test_reduced_prod_keepdim.expect
@@ -64,5 +64,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_reduced_sum.expect b/test/onnx/expect/TestOperators.test_reduced_sum.expect
index b905539..51c17ae 100644
--- a/test/onnx/expect/TestOperators.test_reduced_sum.expect
+++ b/test/onnx/expect/TestOperators.test_reduced_sum.expect
@@ -61,5 +61,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_reduced_sum_keepdim.expect b/test/onnx/expect/TestOperators.test_reduced_sum_keepdim.expect
index 174af16..d53d13d 100644
--- a/test/onnx/expect/TestOperators.test_reduced_sum_keepdim.expect
+++ b/test/onnx/expect/TestOperators.test_reduced_sum_keepdim.expect
@@ -64,5 +64,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_reducemax.expect b/test/onnx/expect/TestOperators.test_reducemax.expect
index 0ac171a..db1c1ec 100644
--- a/test/onnx/expect/TestOperators.test_reducemax.expect
+++ b/test/onnx/expect/TestOperators.test_reducemax.expect
@@ -47,5 +47,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_reducemin.expect b/test/onnx/expect/TestOperators.test_reducemin.expect
index bb234cf..059c584 100644
--- a/test/onnx/expect/TestOperators.test_reducemin.expect
+++ b/test/onnx/expect/TestOperators.test_reducemin.expect
@@ -47,5 +47,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_repeat.expect b/test/onnx/expect/TestOperators.test_repeat.expect
index a740486..82e4bb5 100644
--- a/test/onnx/expect/TestOperators.test_repeat.expect
+++ b/test/onnx/expect/TestOperators.test_repeat.expect
@@ -68,5 +68,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_repeat_dim_overflow.expect b/test/onnx/expect/TestOperators.test_repeat_dim_overflow.expect
index c51ae16..dddf2f9 100644
--- a/test/onnx/expect/TestOperators.test_repeat_dim_overflow.expect
+++ b/test/onnx/expect/TestOperators.test_repeat_dim_overflow.expect
@@ -81,5 +81,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_rrelu.expect b/test/onnx/expect/TestOperators.test_rrelu.expect
index 744fb07..6a0a338 100644
--- a/test/onnx/expect/TestOperators.test_rrelu.expect
+++ b/test/onnx/expect/TestOperators.test_rrelu.expect
@@ -70,5 +70,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_rsub.expect b/test/onnx/expect/TestOperators.test_rsub.expect
index e951830..d87d356 100644
--- a/test/onnx/expect/TestOperators.test_rsub.expect
+++ b/test/onnx/expect/TestOperators.test_rsub.expect
@@ -55,5 +55,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_selu.expect b/test/onnx/expect/TestOperators.test_selu.expect
index 2af3e62..9835d17 100644
--- a/test/onnx/expect/TestOperators.test_selu.expect
+++ b/test/onnx/expect/TestOperators.test_selu.expect
@@ -54,5 +54,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_sin.expect b/test/onnx/expect/TestOperators.test_sin.expect
index 990c2b1..f6a736c 100644
--- a/test/onnx/expect/TestOperators.test_sin.expect
+++ b/test/onnx/expect/TestOperators.test_sin.expect
@@ -42,5 +42,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_slice.expect b/test/onnx/expect/TestOperators.test_slice.expect
index 28ee0ca..7527d15 100644
--- a/test/onnx/expect/TestOperators.test_slice.expect
+++ b/test/onnx/expect/TestOperators.test_slice.expect
@@ -77,5 +77,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_split.expect b/test/onnx/expect/TestOperators.test_split.expect
index 559c47f..c7798ab 100644
--- a/test/onnx/expect/TestOperators.test_split.expect
+++ b/test/onnx/expect/TestOperators.test_split.expect
@@ -88,5 +88,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_split_with_sizes.expect b/test/onnx/expect/TestOperators.test_split_with_sizes.expect
index ec0b907..f7ff653 100644
--- a/test/onnx/expect/TestOperators.test_split_with_sizes.expect
+++ b/test/onnx/expect/TestOperators.test_split_with_sizes.expect
@@ -88,5 +88,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_sqrt.expect b/test/onnx/expect/TestOperators.test_sqrt.expect
index de1fdde..06b59bf 100644
--- a/test/onnx/expect/TestOperators.test_sqrt.expect
+++ b/test/onnx/expect/TestOperators.test_sqrt.expect
@@ -42,5 +42,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_sum.expect b/test/onnx/expect/TestOperators.test_sum.expect
index ef07d61..69f0d02 100644
--- a/test/onnx/expect/TestOperators.test_sum.expect
+++ b/test/onnx/expect/TestOperators.test_sum.expect
@@ -47,5 +47,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_tan.expect b/test/onnx/expect/TestOperators.test_tan.expect
index 8707514..6378140 100644
--- a/test/onnx/expect/TestOperators.test_tan.expect
+++ b/test/onnx/expect/TestOperators.test_tan.expect
@@ -42,5 +42,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_transpose.expect b/test/onnx/expect/TestOperators.test_transpose.expect
index 12c0d56..ccff4fc 100644
--- a/test/onnx/expect/TestOperators.test_transpose.expect
+++ b/test/onnx/expect/TestOperators.test_transpose.expect
@@ -37,5 +37,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_type_as.expect b/test/onnx/expect/TestOperators.test_type_as.expect
index 8a2a0c2..41f2467 100644
--- a/test/onnx/expect/TestOperators.test_type_as.expect
+++ b/test/onnx/expect/TestOperators.test_type_as.expect
@@ -31,5 +31,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_unsqueeze.expect b/test/onnx/expect/TestOperators.test_unsqueeze.expect
index 2161d14..8a97a91 100644
--- a/test/onnx/expect/TestOperators.test_unsqueeze.expect
+++ b/test/onnx/expect/TestOperators.test_unsqueeze.expect
@@ -50,5 +50,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_view.expect b/test/onnx/expect/TestOperators.test_view.expect
index 5bb2d35..71cb888 100644
--- a/test/onnx/expect/TestOperators.test_view.expect
+++ b/test/onnx/expect/TestOperators.test_view.expect
@@ -44,5 +44,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_view_flatten.expect b/test/onnx/expect/TestOperators.test_view_flatten.expect
index b428d3b..4fe33d1 100644
--- a/test/onnx/expect/TestOperators.test_view_flatten.expect
+++ b/test/onnx/expect/TestOperators.test_view_flatten.expect
@@ -192,5 +192,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/expect/TestOperators.test_zeros_like.expect b/test/onnx/expect/TestOperators.test_zeros_like.expect
index 0e73576..9ab783a 100644
--- a/test/onnx/expect/TestOperators.test_zeros_like.expect
+++ b/test/onnx/expect/TestOperators.test_zeros_like.expect
@@ -55,5 +55,5 @@ graph {
   }
 }
 opset_import {
-  version: 10
+  version: 9
 }
diff --git a/test/onnx/test_operators.py b/test/onnx/test_operators.py
index 396ee3f..981f662 100644
--- a/test/onnx/test_operators.py
+++ b/test/onnx/test_operators.py
@@ -547,10 +547,10 @@ class TestOperators(TestCase):
         x = torch.tensor([[[2., 2.], [1., 0.]], [[0., 0.], [1., 1.]]], requires_grad=True)
         self.assertONNX(lambda x: torch.nonzero(x), x)
 
-    def test_stable_opset(self):
+    def test_master_opset(self):
         x = torch.randn(2, 3).float()
         y = torch.randn(2, 3).float()
-        self.assertONNX(lambda x, y: x + y, (x, y), opset_version=9)
+        self.assertONNX(lambda x, y: x + y, (x, y), opset_version=10)
 
 
 if __name__ == '__main__':
diff --git a/torch/onnx/symbolic.py b/torch/onnx/symbolic.py
index 772b11e..cca06c2 100644
--- a/torch/onnx/symbolic.py
+++ b/torch/onnx/symbolic.py
@@ -200,16 +200,18 @@ def _try_get_scalar_type(*args):
 # and the symbolic functions should check it to determine the behavior
 # of the exporter.
 
-_default_onnx_opset_version = 10
-_export_onnx_opset_version = _default_onnx_opset_version
+
+_default_onnx_opset_version = 9
+_onnx_master_opset = 10
 _onnx_stable_opsets = [9]
+_export_onnx_opset_version = _default_onnx_opset_version
 
 
 def _set_opset_version(opset_version):
     global _export_onnx_opset_version
     if opset_version == _default_onnx_opset_version:
         return
-    if opset_version in _onnx_stable_opsets:
+    if opset_version in _onnx_stable_opsets + [_onnx_master_opset]:
         _export_onnx_opset_version = opset_version
         return
     raise ValueError("Unsupported ONNX opset version: " + str(opset_version))
diff --git a/torch/onnx/utils.py b/torch/onnx/utils.py
index b7b89c2..55fd38f 100644
--- a/torch/onnx/utils.py
+++ b/torch/onnx/utils.py
@@ -92,8 +92,10 @@ def export(model, args, f, export_params=True, verbose=False, training=False,
             OperatorExportTypes.RAW: export raw ir.
         opset_version (int, default is 9): by default we export the model to the
             opset version of the onnx submodule. Since ONNX's latest opset may
-            evolve before next stable release, we may want to export to some stable
+            evolve before next stable release, by default we export to one stable
             opset version. Right now, supported stable opset version is 9.
+            The opset_version must be _onnx_master_opset or in _onnx_stable_opsets
+            which are defined in torch/onnx/symbolic.py
     """
     if aten or export_raw_ir:
         assert operator_export_type is None
-- 
2.7.4