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Co-Authored-By: Thomas Wolf <thomwolf@users.noreply.github.com>

Reference: https://github.com/huggingface/transformers/pull/1778#issuecomment-567675530

cc @patrickvonplaten and @dreasysnail

- Clarify that the model is not trained on the evaluation dataset

- Fix path of tokenizer
- Clarify that the model is not trained on the evaluation set

Add integration tests lm generate torch tf

* 1. seqeval required by ner pl example. install from examples/requirements. 2. unrecognized arguments: save_steps

* pl checkpoint callback filenotfound error: make directory and pass

* #3159 pl checkpoint path difference

* 1. Updated Readme for pl 2. pl script now also correct displays logs 3. pass gpu ids compared to number of gpus

* Updated results in readme

* 1. updated readme 2. removing deprecated pl methods 3. finalizing scripts

* comment length check

* using deprecated validation_end for stable results

* style related changes