Update the settings according to the keyword arguments.

        Args:
            kwargs: The keyword arguments to set corresponding fields.

def update(self, **kwargs):
        """Update the settings according to the keyword arguments.

        Args:
            kwargs: The keyword arguments to set corresponding fields.
        """
        for arg in kwargs:
            if hasattr(self, arg):
                setattr(self, arg, kwargs[arg])
            else:
                raise ValueError("Invalid RayParams parameter in"
                                 " update: %s" % arg)

        self._check_usage()