code: def _execute_agg(cls, ctx, op):
      ctx[op.outputs[0].key] = ctx[op.value.key]
  
imports: import numpy
  from ...None import opcodes
  from ...None import tensor
  from ...core import ENTITY_TYPE, get_output_types, recursive_tile
  from ...core.operand import OperandStage
  from ...config import options
  from ...serialization.serializables import KeyField, StringField, BoolField, DataTypeField
  from ...tensor.core import TensorOrder, TENSOR_CHUNK_TYPE
  from ...tensor.array_utils import as_same_device, device, issparse, get_array_module
  from ...utils import ceildiv
  from ..operands import LearnOperand, LearnOperandMixin, OutputType
label_desc: Use image node_id 7 for calling the CheckNonNegative obj's underlying member method code with example usage: obj._execute_agg(cls, ctx, op) without return types