Hi,
I am trying to train a tokenizer and execute the following line of code:
new_tokenizer = tokenizer.train_new_from_iterator(batch_iterator(), vocab_size=25000)

Though, when I execute it, I get this error:
KeyError: "Invalid key: slice(0, 1000, None). Please first select a split. For example: `my_dataset_dictionary['train'][slice(0, 1000, None)]`. Available splits: ['train']"