transformers pytorch safetensors camembert question-answering fr dataset:etalab-ia/piaf dataset:fquad dataset:lincoln/newsquadfr dataset:pragnakalp/squad_v2_french_translated dataset:CATIE-AQ/frenchQA arxiv:1910.09700 doi:10.57967/hf/0821 license:cc-by-4.0 co2_eq_emissions endpoints_compatible region:us