Fast imports part 3 (#9474)

* New intermediate inits

* Update template

* Avoid importing torch/tf/flax in tokenization unless necessary

* Styling

* Shutup flake8

* Better python version check

src/transformers/models/blenderbot_small/__init__.py

@@ -15,15 +15,51 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-from ...file_utils import is_torch_available
-from .configuration_blenderbot_small import BLENDERBOT_SMALL_PRETRAINED_CONFIG_ARCHIVE_MAP, BlenderbotSmallConfig
-from .tokenization_blenderbot_small import BlenderbotSmallTokenizer
+from typing import TYPE_CHECKING
 
+from ...file_utils import _BaseLazyModule, is_torch_available
+
+
+_import_structure = {
+    "configuration_blenderbot_small": ["BLENDERBOT_SMALL_PRETRAINED_CONFIG_ARCHIVE_MAP", "BlenderbotSmallConfig"],
+    "tokenization_blenderbot_small": ["BlenderbotSmallTokenizer"],
+}
 
 if is_torch_available():
-    from .modeling_blenderbot_small import (
-        BLENDERBOT_SMALL_PRETRAINED_MODEL_ARCHIVE_LIST,
-        BlenderbotSmallForConditionalGeneration,
-        BlenderbotSmallModel,
-        BlenderbotSmallPreTrainedModel,
-    )
+    _import_structure["modeling_blenderbot_small"] = [
+        "BLENDERBOT_SMALL_PRETRAINED_MODEL_ARCHIVE_LIST",
+        "BlenderbotSmallForConditionalGeneration",
+        "BlenderbotSmallModel",
+        "BlenderbotSmallPreTrainedModel",
+    ]
+
+
+if TYPE_CHECKING:
+    from .configuration_blenderbot_small import BLENDERBOT_SMALL_PRETRAINED_CONFIG_ARCHIVE_MAP, BlenderbotSmallConfig
+    from .tokenization_blenderbot_small import BlenderbotSmallTokenizer
+
+    if is_torch_available():
+        from .modeling_blenderbot_small import (
+            BLENDERBOT_SMALL_PRETRAINED_MODEL_ARCHIVE_LIST,
+            BlenderbotSmallForConditionalGeneration,
+            BlenderbotSmallModel,
+            BlenderbotSmallPreTrainedModel,
+        )
+
+else:
+    import importlib
+    import os
+    import sys
+
+    class _LazyModule(_BaseLazyModule):
+        """
+        Module class that surfaces all objects but only performs associated imports when the objects are requested.
+        """
+
+        __file__ = globals()["__file__"]
+        __path__ = [os.path.dirname(__file__)]
+
+        def _get_module(self, module_name: str):
+            return importlib.import_module("." + module_name, self.__name__)
+
+    sys.modules[__name__] = _LazyModule(__name__, _import_structure)