code: def _get_output_dtype(cls, df):
      if df.ndim == 2:
          return pd.Series(np.dtype(bool), index=df.dtypes.index)
      else:
          return np.dtype(bool)
  
file_path: mars/mars/dataframe/arithmetic/is_ufuncs.py
imports: import numpy
  import pandas
  from ...None import opcodes
  from ...utils import classproperty
  from .core import DataFrameUnaryUfunc
label_desc: Use image node_id 1 for calling the DataFrameIsUFuncMixin obj's underlying member method code with example usage: obj._get_output_dtype(cls, df) and returns: pd, np