* feature: raise on long sequence drop
It is sometimes not desired that sequences are silently dropped from the dataset, especially when the dataset has been carefully crafted and pre-fitted for the training context. This would then suggest that an error occurred somewhere in the process. This feature adds a third value for excess_length_strategy called 'raise', which will raise a ValueError if a sequence is encountered that is too long and would have normally been dropped/truncated.
* tests: add excess_length_strategy tests
* doc: updated return value description for drop_long_seq_in_dataset
* add @enable_hf_offline
* fixed cfg modified after validate_config called
* hf offline fix
* fix tqdm desc when raise is used
* test: added test for non-batched case
* accidental code change revert
* test: use pytest.raises
* test: simplified drop_seq_len tests
* test: moved excess_length_strat test to test_data.py
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Co-authored-by: salman <salman.mohammadi@outlook.com>
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