fail to run trainer.train() with huggingface transformer
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## Details
<!-- I am trying to set up a TensorFlow fine-tune framework for a question-answering project. Using hugging-face/transformer as the prototype, but cannot run through the trainer.

The experiment is conducted at Databricks, the pre-trained model loaded is base-bert, train and dev sets are downloaded from hugging-face examples SQUAD 2.0 https://github.com/huggingface/transformers/tree/master/examples/question-answering

The error log complains about the unexpected keyword argument 'is_impossible', which is a SQUAD 2 data format feature. -->

<!-- Here is the link to my question on stackoverflow -->
**https://stackoverflow.com/questions/62879960/fail-to-run-trainer-train-with-huggingface-transformer**:
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