code: def create_val_set(csv_file, val_fraction):
      """Takes in a csv file path and creates a validation set
      out of it specified by val_fraction.
      """
      dataset = pd.read_csv(csv_file)
      np.random.seed(0)
      dataset_mod = dataset[dataset.toxic != -1]
      indices = np.random.rand(len(dataset_mod)) > val_fraction
      val_set = dataset_mod[~indices]
      val_set.to_csv("val.csv")
  
imports: import argparse
  import numpy
  import pandas
label_desc: Use image node_id 2 for calling a global function with example usage: create_val_set(csv_file, val_fraction) without return types