Calls the audio column to load and resample the audio file.
Extracts the input_values from the audio file and tokenize the transcription column with the processor.

def prepare_dataset(batch):
     audio = batch["audio"]
     batch = processor(audio["array"], sampling_rate=audio["sampling_rate"], text=batch["transcription"])
     batch["input_length"] = len(batch["input_values"][0])
     return batch