code: def train_from_file(self, train_file, vocab_size, model_file, _):
      tmp = model_file.split(".")
      assert len(tmp) == 2
      assert tmp[1] == "model"
      train_command = f"spm_train "
      train_command += f" --input={str(train_file)} "
      train_command += f" --model_prefix={tmp[0]} "
      train_command += f" --vocab_size={vocab_size} "
      train_command += f" --character_coverage=1.0 "
      train_command += f" --model_type=bpe "
      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 SentencePieceInterface obj's underlying member method code with example usage: obj.train_from_file(train_file, vocab_size, model_file, _) without return types