Added **kwargs (#377)

* Added **kwargs

Fixed keywords for timm for vision transformer models

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

flash/image/backbones.py

@@ -161,11 +161,9 @@ def _fn_timm(
         model_name: str,
         pretrained: bool = True,
         num_classes: int = 0,
-        global_pool: str = '',
+        **kwargs,
     ) -> Tuple[nn.Module, int]:
-        backbone = timm.create_model(
-            model_name, pretrained=pretrained, num_classes=num_classes, global_pool=global_pool
-        )
+        backbone = timm.create_model(model_name, pretrained=pretrained, num_classes=num_classes, **kwargs)
         num_features = backbone.num_features
         return backbone, num_features