Add t5 convert to transformers-cli (#9654)

* Update run_mlm.py

* add t5 model to transformers-cli convert

* update rum_mlm.py same as master

* update converting model docs

* update converting model docs

* Update convert.py

* Trigger notification

* update import sorted

* fix typo t5

src/transformers/commands/convert.py

@@ -110,6 +110,13 @@ class ConvertCommand(BaseTransformersCLICommand):
             except ImportError:
                 raise ImportError(IMPORT_ERROR_MESSAGE)
 
+            convert_tf_checkpoint_to_pytorch(self._tf_checkpoint, self._config, self._pytorch_dump_output)
+        elif self._model_type == "t5":
+            try:
+                from ..models.t5.convert_t5_original_tf_checkpoint_to_pytorch import convert_tf_checkpoint_to_pytorch
+            except ImportError:
+                raise ImportError(IMPORT_ERROR_MESSAGE)
+
             convert_tf_checkpoint_to_pytorch(self._tf_checkpoint, self._config, self._pytorch_dump_output)
         elif self._model_type == "gpt":
             from ..models.openai.convert_openai_original_tf_checkpoint_to_pytorch import (
@@ -168,5 +175,5 @@ class ConvertCommand(BaseTransformersCLICommand):
             convert_lxmert_checkpoint_to_pytorch(self._tf_checkpoint, self._pytorch_dump_output)
         else:
             raise ValueError(
-                "--model_type should be selected in the list [bert, gpt, gpt2, transfo_xl, xlnet, xlm, lxmert]"
+                "--model_type should be selected in the list [bert, gpt, gpt2, t5, transfo_xl, xlnet, xlm, lxmert]"
             )