code: def long_dataset(long_dataframe):  # initialized with dict
      return pandas.PandasDataset.from_long_dataframe(
          dataframe=long_dataframe,
          target="target",
          timestamp="time",
          item_id="item",
          freq="1H",
          feat_dynamic_real=["dyn_real_1"],
      )
  
imports: import io
  from typing import Callable, List, Union
  import pandas
  import numpy
  import pytest
  from gluonts.dataset import pandas
  from gluonts.testutil.equality import assert_recursively_equal
label_desc: Use image node_id 4 for calling a global function with example usage: long_dataset(long_dataframe) and returns: pandas