Calculated offsets are wrong in squad.py
- when tokenizer.padding_side == "left" and if tokenizer.pad_token_id in span["input_ids"]:
doc_offset should add last_padding_id_position+1 instead of 0.
       
        start_position = 0
        end_position = 0
        if is_training and not span_is_impossible:
            # For training, if our document chunk does not contain an annotation
            # we throw it out, since there is nothing to predict.
            doc_start = span["start"]
            doc_end = span["start"] + span["length"] - 1
            out_of_span = False

            if not (tok_start_position >= doc_start and tok_end_position <= doc_end):
                out_of_span = True

            if out_of_span:
                start_position = cls_index
                end_position = cls_index
                span_is_impossible = True
            else:
                if tokenizer.padding_side == "left":
                    doc_offset = 0
                else:
                    doc_offset = len(truncated_query) + sequence_added_tokens

                start_position = tok_start_position - doc_start + doc_offset
                end_position = tok_end_position - doc_start + doc_offset
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