code: def execute_agg(cls, ctx, op):
      return TensorSum.execute_agg(ctx, op)
  
file_path: mars/mars/tensor/reduction/count_nonzero.py
imports: import numpy
  from ...None import opcodes
  from ..array_utils import device, as_same_device
  from .sum import TensorSum
  from .core import TensorReduction, TensorReductionMixin
label_desc: Use image node_id 3 for calling the TensorCountNonzero obj's underlying member method code with example usage: obj.execute_agg(cls, ctx, op) and returns: TensorSum