code: def __init__(self, axis=None, **kw):
      super().__init__(_axis=axis, **kw)
  
file_path: mars/mars/tensor/merge/stack.py
imports: import itertools
  import numpy
  from ...None import opcodes
  from ...serialization.serializables import Int32Field
  from ...utils import has_unknown_shape
  from ..utils import unify_chunks, check_out_param
  from ..array_utils import as_same_device, device
  from ..operands import TensorOperand, TensorOperandMixin
  from ..datasource import tensor
  from ..core import Tensor, TensorOrder
label_desc: Use image node_id 1 to create a new TensorStack object from inherited base classes: TensorOperand, TensorOperandMixin with example: obj = TensorStack(axis)