*
 * `numerical_grad` is the pointer to the AbstractTensorHandle* which will
 * hold the numerical gradient data at the end of the function.
 */
absl::Status CalcNumericalGrad(AbstractContext* ctx, Model forward,
                               absl::Span<AbstractTensorHandle* const> inputs,
                               int input_index, bool use_function,
                               AbstractTensorHandle** numerical_grad);

// return an error, the returned loader will return that error.
func JoinLoaders(loaders ...MetricsLoaderFn) MetricsLoaderFn {
	return func(ctx context.Context, m MetricValues, c *metricsCache) error {
		for _, loader := range loaders {
			if err := loader(ctx, m, c); err != nil {
				return err
			}
		}
		return nil
	}
}

// BucketMetricsLoaderFn - represents a function to load metrics from the

		size += len(block)
	}
	return size
}

// Writes all the data blocks from encoded blocks until requested
// outSize length. Provides a way to skip bytes until the offset.
func writeDataBlocks(ctx context.Context, dst io.Writer, enBlocks [][]byte, dataBlocks int, offset int64, length int64) (int64, error) {
	// Offset and out size cannot be negative.
	if offset < 0 || length < 0 {
		return 0, errUnexpected
	}

		"Total number of messages sent to this target",
		allWebhookLabels...)
)

// loadLoggerWebhookMetrics - `MetricsLoaderFn` for logger webhook
// such as failed messages and total messages.
func loadLoggerWebhookMetrics(ctx context.Context, m MetricValues, c *metricsCache) error {
	tgts := append(logger.SystemTargets(), logger.AuditTargets()...)
	for _, t := range tgts {
		labels := []string{nameL, t.String(), endpointL, t.Endpoint()}

		},
		rcfg:         replicationConfig{Config: &configs[0]},
		expectedSync: false,
	},
}

func TestReplicationResync(t *testing.T) {
	ctx := context.Background()
	for i, test := range replicationConfigTests {
		if sync := test.rcfg.Resync(ctx, test.info, test.dsc, test.tgtStatuses); sync.mustResync() != test.expectedSync {

// A goroutine will be started and run until the provided context is canceled.
func (r *RingBuffer) WithCancel(ctx context.Context) *RingBuffer {
	go func() {
		select {
		case <-ctx.Done():
			r.CloseWithError(ctx.Err())
		}
	}()
	return r
}

func (r *RingBuffer) setErr(err error, locked bool) error {
	if !locked {
		r.mu.Lock()
		defer r.mu.Unlock()
	}

)

func b2f(v bool) float64 {
	if v {
		return 1
	}
	return 0
}

// loadClusterErasureSetMetrics - `MetricsLoaderFn` for cluster storage erasure
// set metrics.
func loadClusterErasureSetMetrics(ctx context.Context, m MetricValues, c *metricsCache) error {
	result, _ := c.esetHealthResult.Get()

	m.Set(erasureSetOverallWriteQuorum, float64(result.WriteQuorum))
	m.Set(erasureSetOverallHealth, b2f(result.Healthy))

)

// loadClusterReplicationMetrics - `MetricsLoaderFn` for cluster replication metrics
// such as transfer rate and objects queued.
func loadClusterReplicationMetrics(ctx context.Context, m MetricValues, c *metricsCache) error {
	st := globalReplicationStats.Load()
	if st == nil {
		return nil
	}

	qs := st.getNodeQueueStatsSummary()

	qt := qs.QStats

		fmt.Println(err)
		return
	}

	scopes := ddoc.ScopesSupported
	if clientScopes != "" {
		scopes = strings.Split(clientScopes, ",")
	}

	ctx := context.Background()

	config := oauth2.Config{
		ClientID:     clientID,
		ClientSecret: clientSec,
		Endpoint: oauth2.Endpoint{
			AuthURL:  ddoc.AuthEndpoint,
			TokenURL: ddoc.TokenEndpoint,
		},

  istioctl analyze samples/bookinfo/networking/bookinfo-gateway.yaml
`,
		Args: cobra.NoArgs,
		RunE: func(c *cobra.Command, _ []string) error {
			istioNamespace := ctx.IstioNamespace()
			defaultNamespace := ctx.NamespaceOrDefault("")
			return validateFiles(&istioNamespace, defaultNamespace, filenames, c.OutOrStderr())
		},
	}

	flags := c.PersistentFlags()