def add_ceil(self, name, input_name, output_name):
        """
        Add a ceil layer to the model that performs element-wise ceil operation
        on the input tensor that rounds the value to the smallest integer not
        less than x.
        Refer to the ``CeilLayerParams`` message in the specification (NeuralNetwork.proto) for more details.

        Parameters
        ----------
        name: str
            The name of this layer.
        input_name: str
            The input blob name of this layer.
        output_name: str
            The output blob name of this layer.

        See Also
        --------
        add_floor, add_clip
        """

        spec_layer = self._add_generic_layer(name, [input_name], [output_name])
        spec_layer.ceil.MergeFromString(b"")
        return spec_layer

        Add a ceil layer to the model that performs element-wise ceil operation
        on the input tensor that rounds the value to the smallest integer not
        less than x.
        Refer to the ``CeilLayerParams`` message in the specification (NeuralNetwork.proto) for more details.

        Parameters
        ----------
        name: str
            The name of this layer.
        input_name: str
            The input blob name of this layer.
        output_name: str
            The output blob name of this layer.

        See Also
        --------
        add_floor, add_clip
        
coremltools/models/neural_network/builder.py