code: def execute_combine(cls, ctx, op):
      TensorMean.execute_combine(ctx, op)
  
file_path: mars/mars/tensor/reduction/nanmean.py
imports: import numpy
  from ...None import opcodes
  from ..datasource import tensor
  from ..array_utils import as_same_device, device
  from .core import TensorReduction, TensorReductionMixin, nannumel
  from .mean import TensorMean
label_desc: Use image node_id 4 for calling the TensorNanMean obj's underlying member method code with example usage: obj.execute_combine(cls, ctx, op) without return types