examples/flax/language-modeling/run_mlm_flax.py/tokenize_function
        def tokenize_function(examples):
            # Remove empty lines
            examples = [line for line in examples if len(line) > 0 and not line.isspace()]
            return tokenizer(
                examples,
                return_special_tokens_mask=True,
                padding=padding,
                truncation=True,
                max_length=max_seq_length,
            )