message.length(), &forward_op);
  ASSERT_EQ(errors::OK, s.code()) << s.message();
  int num_retvals = 1;
  std::vector<AbstractTensorHandle*> outputs(1);
  GradientRegistry registry;
  s = RegisterGradients(&registry);
  ASSERT_EQ(errors::OK, s.code()) << s.message();
  auto tape = std::make_unique<Tape>(/*persistent=*/false);

    }

    /**
     * @param message a message
     * @param cause a cause
     * @deprecated use {@link #ArtifactMetadataRetrievalException(String, Throwable, Artifact)}
     */
    @Deprecated
    public ArtifactMetadataRetrievalException(String message, Throwable cause) {
        this(message, cause, null);
    }

    public ArtifactMetadataRetrievalException(String message, Throwable cause, Artifact artifact) {

  /** Constructs a {@code VerifyException} with no message. */
  public VerifyException() {}

  /** Constructs a {@code VerifyException} with the message {@code message}. */
  public VerifyException(@CheckForNull String message) {
    super(message);
  }

  /**
   * Constructs a {@code VerifyException} with the cause {@code cause} and a message that is {@code

 *
 */
@Deprecated
public class RepositoryMetadataInstallationException extends Throwable {
    public RepositoryMetadataInstallationException(String message) {
        super(message);
    }

    public RepositoryMetadataInstallationException(String message, Exception e) {
        super(message, e);
    }

@Deprecated
public class ArtifactDeploymentException extends Exception {
    public ArtifactDeploymentException(String message) {
        super(message);
    }

    public ArtifactDeploymentException(Throwable cause) {
        super(cause);
    }

    public ArtifactDeploymentException(String message, Throwable cause) {
        super(message, cause);
    }

public class ArtifactInstallationException extends Exception {
    public ArtifactInstallationException(String message) {
        super(message);
    }

    public ArtifactInstallationException(Throwable cause) {
        super(cause);
    }

    public ArtifactInstallationException(String message, Throwable cause) {
        super(message, cause);
    }

 */
public class InvalidPluginDescriptorException extends PlexusConfigurationException {

    public InvalidPluginDescriptorException(String message, Throwable cause) {
        super(message, cause);
    }

    public InvalidPluginDescriptorException(String message) {
        super(message);
    }

/**
 */
public class ProjectCycleException extends BuildFailureException {
    public ProjectCycleException(String message) {
        super(message);
    }

    public ProjectCycleException(String message, CycleDetectedException cause) {
        super(message, cause);
    }

  }

  /**
   * Ensures that {@code expression} is {@code true}, throwing a {@code VerifyException} with a
   * custom message otherwise.
   *
   * @param expression a boolean expression
   * @param errorMessageTemplate a template for the exception message should the check fail. The
   *     message is formed by replacing each {@code %s} placeholder in the template with an

  }

  /**
   * Ensures that {@code expression} is {@code true}, throwing a {@code VerifyException} with a
   * custom message otherwise.
   *
   * @param expression a boolean expression
   * @param errorMessageTemplate a template for the exception message should the check fail. The
   *     message is formed by replacing each {@code %s} placeholder in the template with an