class_docstr: Class representing the operator node in DALI Pipeline/graph.
  The entry point accepts grouped arguments: inputs (positional arguments with DataNodes),
  arguments (dictionary with scalar values), and argument inputs (dictionary with DataNodes).
  
  It is responsible for the full* validation of the three input/argument kinds and their
  additional processing (scalar promotions, deprecations and renaming, splitting for conditionals)
  
  Each "_process_[arguments/inputs]" step adds them to the OpSpec specifying the operator for
  the C++ backend.
  
  * some validation is done in class Operator.__init__ due to legacy reasons.
  This is the reason for `_processed_arguments` constructor parameter.
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code: def outputs(self):
      return self._outputs
  
imports: import sys
  import threading
  import tree
  import warnings
  from itertools import count
  import nvidia.dali.python_function_plugin
  from nvidia.dali import backend
  from nvidia.dali import fn
  from nvidia.dali import internal
  from nvidia.dali.data_node import DataNode
  from nvidia.dali.pipeline import Pipeline
  from nvidia.dali.types import _type_name_convert_to_string, _type_convert_value, _default_converter, _vector_element_type, ScalarConstant, Constant
  from nvidia.dali import _conditionals
  from nvidia.dali.ops import _registry, _names, _docs, _operator_utils
  from nvidia.dali.ops._registry import cpu_ops, mixed_ops, gpu_ops, register_cpu_op, register_gpu_op
  from nvidia.dali.ops._names import _op_name, _process_op_name, _schema_name
  from nvidia.dali.ops._operator_utils import _build_input_sets, _repack_output_sets
  from nvidia.dali.external_source import ExternalSource
  from nvidia.dali.ops._operators.python_function import PythonFunctionBase, PythonFunction, DLTensorPythonFunction, _dlpack_to_array, _dlpack_from_array
  from nvidia.dali.ops._operators.compose import Compose
  from nvidia.dali.ops._operators.math import _arithm_op, _group_inputs, _generate_input_desc
label_desc: Use image node_id 7 for calling the _OperatorInstance obj's underlying member method code with example usage: obj.outputs() and returns: self