class_docstr: For loading protein sequence datasets in the common FASTA data format
class_docstr_tok: ["For","loading","protein","sequence","datasets","in","the","common","FASTA","data","format"]
code: def _get_file(self):
      if not hasattr(self.threadlocal, "f"):
          self.threadlocal.f = open(self.fn, "r")
      return self.threadlocal.f
  
imports: import os
  import subprocess
  import threading
  from pathlib import Path
  import numpy
  import torch
label_desc: Use image node_id 2 for calling the FastaDataset obj's underlying member method code with example usage: obj._get_file() and returns: self