Reorganize repo (#8580)

* Put models in subfolders

* Styling

* Fix imports in tests

* More fixes in test imports

* Sneaky hidden imports

* Fix imports in doc files

* More sneaky imports

* Finish fixing tests

* Fix examples

* Fix path for copies

* More fixes for examples

* Fix dummy files

* More fixes for example

* More model import fixes

* Is this why you're unhappy GitHub?

* Fix imports in conver command

src/transformers/utils/dummy_tokenizers_objects.py

@@ -218,15 +218,6 @@ class T5TokenizerFast:
         requires_tokenizers(self)
 
 
-class PreTrainedTokenizerFast:
-    def __init__(self, *args, **kwargs):
-        requires_tokenizers(self)
-
-    @classmethod
-    def from_pretrained(self, *args, **kwargs):
-        requires_tokenizers(self)
-
-
 class XLMRobertaTokenizerFast:
     def __init__(self, *args, **kwargs):
         requires_tokenizers(self)
@@ -245,6 +236,15 @@ class XLNetTokenizerFast:
         requires_tokenizers(self)
 
 
+class PreTrainedTokenizerFast:
+    def __init__(self, *args, **kwargs):
+        requires_tokenizers(self)
+
+    @classmethod
+    def from_pretrained(self, *args, **kwargs):
+        requires_tokenizers(self)
+
+
 SLOW_TO_FAST_CONVERTERS = None