No longer able to fine-tune GPT2 using provided examples
A few months ago, I was able to run GPT2 on a Google Colab notebook. This was using the following script, which is based on the provided docs:

```
!git clone https://github.com/huggingface/transformers
%cd transformers
!pip install .
!pip install -r ./examples/requirements.txt

!python /content/transformers/examples/run_lm_finetuning.py \
    --output_dir=output \
    --model_type=gpt2 \
    --model_name_or_path=gpt2 \
    --do_train \
    --train_data_file=/content/train.txt \
    --do_eval \
    --eval_data_file=/content/test.txt \
    --per_gpu_train_batch_size=2

!python /content/transformers/examples/run_generation.py \
    --model_type=gpt2 \
    --model_name_or_path=gpt2 \
    --length 500
```
Coming back to it after a little while, it no longer works. I realise that `run_lm_finetuning.py` has been replaced by `run_language_modeling.py`. However, running this file instead either produces a `command not found error`, or it asks me to provide details that I've already provided: `the following arguments are required: --train_data_file, --output_dir, --model_type`.

I appreciate that you guys perform a great service to the community by making these models available, and I thank you for doing so. I also understand that it's my responsibility to keep up with changes. All the same, any help in getting this functionality back on track would be appreciated!


Never mind; this was an issue with the colab. It's sorted now.