class_docstr: ```
  Abstract class to preprocess data
  ```
class_docstr_tok: ["``","`","Abstract","class","to","preprocess","data","``","`"]
code: def _save_preproc(self, fpath):
      with open(os.path.join(fpath, U.PREPROC_NAME), "wb") as f:
          pickle.dump(self.preproc, f)
      return
  
file_path: ktrain/ktrain/predictor.py
imports: from .None import utils
  from .imports import *
label_desc: Use image node_id 5 for calling the Predictor obj's underlying member method code with example usage: obj._save_preproc(fpath) without return types