text: Title: hyper-paramter `r` in adalora_confg and lora_config
  Body: It is clear that `r` in lora_config refers to rank. However, in adalora, I noticed that `r` also exists (besides `target_r` and `init_r`) and is used in the example. I am wondering what this `r` represents in adalora? Thanks.
  
  ```
  from transformers import AutoModelForSeq2SeqLM, LoraConfig >>> from peft import AdaLoraModel, AdaLoraConfig
  
  config = AdaLoraConfig(
  peft_type="ADALORA", task_type="SEQ_2_SEQ_LM", r=8, lora_alpha=32, target_modules=["q", "v"],
  lora_dropout=0.01,
  )
  ```