Why there is no TransfoXLForSequenceClassification class?
Hello, huggingface! Thank you for the great work with doing neat interfaces for transformers family!

I'm analyzing performance of transformers on a task of texts classification (like SST-2 in GLUE). I found that many architectures has `<ModelName>ForSequenceClassification` class, But `transformerXL` has restricted set of auxiliary classes (https://github.com/huggingface/transformers/blob/master/src/transformers/modeling_transfo_xl.py). 

Is there any reasons for missing these useful class? Is it planned to be implemented or is there any restrictions for such implementation?




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