GPT2Tokenizer.decode() slow for individual tokens
`GPT2Tokenizer.decode()` is considerable slow when invoking it for each token individually, not for a set of tokens... I need to pass in a set of tokens and get back a set of strings for each token. I tried convert_ids_to_tokens() but I'm getting results with the Ġ character. Should I simply remove that character from the results?

I also tried `GPT2TokenizerFast`, but it failed with `"encoder() takes from 2 to 3 positional arguments but 6 were given"` when I was trying to use batch_encode_plus() to pad my tokens with the following arguments: tokens (that were already encoded), pad_to_max_length=True and return_tensors='pt' . transformers ver 2.6.0 - is this a bug?
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