class_docstr: Mapping that only sees ``TensorVariable`` instances (i.e., activation tensors).
code: def __iter__(self):
      precision_keys = [
          k
          for k, v in self.attributes.items()
          if isinstance(v, self.clazz)
      ]
      for key in precision_keys:
          if key.startswith("out_"):
              yield key[len("out_") :]
          else:
              yield key
      super().__iter__()
  
imports: from collections.abc import MutableMapping
  from numbers import Integral
  from hls4ml.model.types import NamedType, Source, TensorVariable, WeightVariable
  from hls4ml.utils.string_utils import convert_to_pascal_case
label_desc: Use image node_id 3 for calling the VariableMapping obj's underlying member method code with example usage: obj.__iter__() without return types