code: def train_from_file(self, file_path, vocab_size, model_file, _):
      train_command = f"{PATH_TO_FASTBPE} learnbpe"
      train_command += f" {vocab_size} {str(file_path)} > {model_file}"
      assert os.system(train_command) == 0
  
imports: import argparse
  import os
  from pathlib import Path
  from time import time
  from tabulate import tabulate
  from tokenizers import pre_tokenizers
  from tokenizers import Tokenizer
  from tokenizers.models import BPE
  from tokenizers.trainers import BpeTrainer
label_desc: Use image node_id 1 for calling the FastBPEInterface obj's underlying member method code with example usage: obj.train_from_file(file_path, vocab_size, model_file, _) without return types