TableQuestionAnsweringPipeline (#9145)

* AutoModelForTableQuestionAnswering

* TableQuestionAnsweringPipeline

* Apply suggestions from Patrick's code review

Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>

* Sylvain and Patrick comments

* Better PyTorch/TF error message

* Add integration tests

* Argument Handler naming

Co-authored-by: patrickvonplaten <patrick.v.platen@gmail.com>

* Fix docs to appease the documentation gods

Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>

src/transformers/testing_utils.py

@@ -172,6 +172,19 @@ def require_torch(test_case):
         return test_case
 
 
+def require_torch_scatter(test_case):
+    """
+    Decorator marking a test that requires PyTorch scatter.
+
+    These tests are skipped when PyTorch scatter isn't installed.
+
+    """
+    if not _scatter_available:
+        return unittest.skip("test requires PyTorch scatter")(test_case)
+    else:
+        return test_case
+
+
 def require_tf(test_case):
     """
     Decorator marking a test that requires TensorFlow.