namespace tensorflow {

namespace {

class WhileLoopTest : public ::testing::Test {
 protected:
  WhileLoopTest() : scope_(Scope::NewRootScope()) {}

  void Init(int num_inputs, DataType dtype = DT_INT32) {
    for (int i = 0; i < num_inputs; ++i) {
      inputs_.push_back(ops::Placeholder(scope_, dtype));
    }
  }

  void CreateLoop(const ops::CondGraphBuilderFn& cond,
                  const ops::BodyGraphBuilderFn& body,

2.  Write the op gradient with the following naming scheme:

    ```
    Status OpNameGrad(const Scope& scope, const Operation& op,
                      const std::vector<Output>& grad_inputs,
                      std::vector<Output>* grad_outputs) {
      ...
      return scope.status();
    }
    REGISTER_GRADIENT_OP("OpName", OpNameGrad);
    ```

3.  Ops gradients are implemented by using the

};

SymbolicGradientBuilder::SymbolicGradientBuilder(
    const Scope& scope, const ops::GradOpRegistry* registry,
    const std::vector<Output>& outputs, const std::vector<Output>& inputs,
    const std::vector<Output>& grad_inputs, std::vector<Output>* grad_outputs)
    : scope_(scope),
      registry_(registry),
      outputs_(outputs),
      inputs_(inputs),
      grad_inputs_(grad_inputs),

        scope_.graph()->AddControlEdge(e->src(), new_const.node());
      }
    }
    return it->second;
  }

 private:
  Scope scope_;
  std::unordered_map<int, Output> cache_;
  std::vector<const Edge*> control_deps_;
};

// Returns a node computing the size of the Slice op with inputs `slice_inputs`.
Status ComputeSliceSize(const Scope& host_scope,

// and looked up by name. The zero value for Scope is a ready-to-use
// empty scope.
type Scope struct {
	parent   *Scope
	children []*Scope
	number   int               // parent.children[number-1] is this scope; 0 if there is no parent
	elems    map[string]Object // lazily allocated
	pos, end token.Pos         // scope extent; may be invalid
	comment  string            // for debugging only

func NewScope(parent *Scope, pos, end syntax.Pos, comment string) *Scope {
	s := &Scope{parent, nil, 0, nil, pos, end, comment, false}
	// don't add children to Universe scope!
	if parent != nil && parent != Universe {
		parent.children = append(parent.children, s)
		s.number = len(parent.children)
	}
	return s
}

// Parent returns the scope's containing (parent) scope.
func (s *Scope) Parent() *Scope { return s.parent }

			s.nameToEmit = name
		}

		scopes[name] = s
	}

	s.labels = make(map[string]any)

	return s
}

// FindScope returns a previously registered scope, or nil if the named scope wasn't previously registered
func FindScope(scope string) *Scope {
	lock.RLock()
	defer lock.RUnlock()

	s := scopes[scope]
	return s
}

// Scopes returns a snapshot of the currently defined set of scopes

  // scopes, or scopes derived from an existing scope object.

  /// Return a new scope.
  /// This creates a new graph and all operations constructed in this graph
  /// should use the returned object as the "root" scope.
  static Scope NewRootScope();

  /// Return a new scope. Ops created with this scope will have

	"istio.io/istio/pkg/test/framework/resource"
	"istio.io/istio/pkg/test/scopes"
)

// scope hold resources in a particular scope.
type scope struct {
	// friendly name for the scope for debugging purposes.
	id string

	parent *scope

	resources []resource.Resource

	closers []io.Closer

	children []*scope

	closeChan chan struct{}

	topLevel bool

	skipDump bool

}

// ScopeTopic returns a ControlZ topic that allows visualization of process logging scopes.
func ScopeTopic() fw.Topic {
	return scopeTopic{}
}

func (scopeTopic) Title() string {
	return "Logging Scopes"
}

func (scopeTopic) Prefix() string {
	return "scope"
}

func getScopeInfo(s *log.Scope) *scopeInfo {
	return &scopeInfo{
		Name:            s.Name(),
		Description:     s.Description(),