Add torch.export nightly tutorial (pytorch#2603)

* add torch.export nightly tutorial

* add sample outputs to nightly tutorial; add script the tutorial was based on (not run)

* fix validate_tutorials_built.py

* fix export nightly tutorial rst

* tell sphinx-gallery to ignore _torch_export_nightly_tutorial.py

* update torch.export nightly tutorial with decomp section and other small fixes

* add credit :)

Author: williamwen42

.jenkins/validate_tutorials_built.py

@@ -22,10 +22,11 @@
     "beginner_source/former_torchies/tensor_tutorial_old",
     "beginner_source/examples_autograd/polynomial_autograd",
     "beginner_source/examples_autograd/polynomial_custom_function",
-    "beginner_source/t5_tutorial", # re-enable after this is fixed: https://github.com/pytorch/text/issues/1756 
+    "beginner_source/t5_tutorial", # re-enable after this is fixed: https://github.com/pytorch/text/issues/1756
     "intermediate_source/parametrizations",
     "intermediate_source/mnist_train_nas",  # used by ax_multiobjective_nas_tutorial.py
     "intermediate_source/fx_conv_bn_fuser",
+    "intermediate_source/_torch_export_nightly_tutorial",  # does not work on release
     "advanced_source/super_resolution_with_onnxruntime",
     "advanced_source/ddp_pipeline",  # requires 4 gpus
     "prototype_source/fx_graph_mode_ptq_dynamic",

conf.py

@@ -106,7 +106,8 @@ def reset_seeds(gallery_conf, fname):
     'first_notebook_cell': ("# For tips on running notebooks in Google Colab, see\n"
                             "# https://pytorch.org/tutorials/beginner/colab\n"
                             "%matplotlib inline"),
-    'reset_modules': (reset_seeds)
+    'reset_modules': (reset_seeds),
+    'ignore_pattern': r'_torch_export_nightly_tutorial.py'
 }
 
 if os.getenv('GALLERY_PATTERN'):