code: def __init__(self, **kw):
      super().__init__(**kw)
      self.output_types = [OutputType.series]
  
file_path: mars/mars/dataframe/base/value_counts.py
imports: import numpy
  import pandas
  from ...None import opcodes
  from ...core import OutputType, recursive_tile
  from ...core.operand import OperandStage
  from ...serialization.serializables import KeyField, BoolField, Int64Field, StringField
  from ...utils import has_unknown_shape, pd_release_version
  from ..core import Series
  from ..operands import DataFrameOperand, DataFrameOperandMixin
  from ..utils import build_series, parse_index
label_desc: Use image node_id 1 to create a new DataFrameValueCounts object from inherited base classes: DataFrameOperand, DataFrameOperandMixin with example: obj = DataFrameValueCounts()