code: def main():
      _main(sys.argv[1:])
  
file_path: petastorm/petastorm/etl/petastorm_generate_metadata.py
imports: import argparse
  import sys
  from pydoc import locate
  from pyarrow import parquet
  from pyspark.sql import SparkSession
  from petastorm.etl.dataset_metadata import materialize_dataset, get_schema, ROW_GROUPS_PER_FILE_KEY
  from petastorm.etl.rowgroup_indexing import ROWGROUPS_INDEX_KEY
  from petastorm.fs_utils import FilesystemResolver
  from petastorm.unischema import Unischema
  from petastorm.utils import add_to_dataset_metadata
label_desc: Use image node_id 3 for calling a global function with example usage: main() without return types