code: def test_read_s3(self):
      access_key_id = os.getenv("AWS_ACCESS_KEY_ID")
      secret_access_key = os.getenv("AWS_SECRET_ACCESS_KEY")
      if access_key_id and secret_access_key:
          file_path = "s3://analytics-zoo-data/nyc_taxi.csv"
          data_shard = bigdl.orca.data.pandas.read_csv(file_path)
          data = data_shard.collect()
          df = data[0]
          assert "value" in df.columns, "value is not in columns"
  
file_path: BigDL/python/orca/test/bigdl/orca/data/test_pandas_backend.py
imports: import os.path
  import shutil
  import pytest
  from unittest import TestCase
  import bigdl.orca.data
  import bigdl.orca.data.pandas
  from bigdl.orca import OrcaContext
  from bigdl.dllib.nncontext import *
label_desc: Use image node_id 5 for calling the TestXShardsPandasBackend obj's underlying member method code with example usage: obj.test_read_s3() without return types