chunk_content:  be applied with the map function:
  
  
  	Copied
  from datasets import load_dataset
  
  dataset = load_dataset("financial_phrasebank", "sentences_allagree")
  dataset = dataset["train"].train_test_split(test_size=0.1)
  dataset["validation"] = dataset["test"]
  del dataset["test"]
  
  classes = dataset["train"].features["label"].names
  dataset = dataset.map(
      lambda x: {"text_label": [classes[label] for label in x["label"]]},
      batched=True,
      num_proc=1,