Fix import bugs in text-transformers (#103)

* Fix import bugs in text-transformers.py
- Add torchtext version in .meta.yaml
* Update .meta.yml

Co-authored-by: Jirka Borovec <Borda@users.noreply.github.com>

Author: hankyul2

lightning_examples/text-transformers/.meta.yml

@@ -1,9 +1,9 @@
 title: Finetune Transformers Models with PyTorch Lightning
 author: PL team
 created: 2021-01-31
-updated: 2021-06-21
+updated: 2021-12-03
 license: CC BY-SA
-build: 1
+build: 2
 tags:
   - Text
 description: |
@@ -15,6 +15,7 @@ requirements:
   - datasets
   - scipy
   - scikit-learn
+  - torchtext>=0.9
 accelerator:
   - CPU
   - GPU

lightning_examples/text-transformers/text-transformers.py

@@ -220,7 +220,7 @@ def setup(self, stage=None) -> None:
         if stage != "fit":
             return
         # Get dataloader by calling it - train_dataloader() is called after setup() by default
-        train_loader = self.train_dataloader()
+        train_loader = self.trainer.datamodule.train_dataloader()
 
         # Calculate total steps
         tb_size = self.hparams.train_batch_size * max(1, self.trainer.gpus)