class_docstr: Wrap a user-provided reduction function in a MetricReducer API.  It is not as efficient as the
  full MetricReducer API but simpler for users.
class_docstr_tok: ["Wrap","a","user-provided","reduction","function","in","a","MetricReducer","API",".","It","is","not","as","efficient","as","the","full","MetricReducer","API","but","simpler","for","users","."]
code: def per_slot_reduce(self) -> Any:
      return self.values
  
imports: import abc
  import enum
  import itertools
  from typing import Any, Callable, Dict, List, Optional, TypeVar, Union, overload
  import numpy
label_desc: Use image node_id 4 for calling the _SimpleReducer obj's underlying member method code with example usage: obj.per_slot_reduce() and returns: self