Add an embedding layer to the model.

        Parameters
        ----------
        name: str
            The name of this layer
        W: numpy.array
            Weight matrix of shape (output_channels, input_dim).
        b: numpy.array
            Bias vector of shape (output_channels, ).
        input_dim: int
            Size of the vocabulary (1 + maximum integer index of the words).
        output_channels: int
            Number of output channels.
        has_bias: boolean
            Whether the bias vector of this layer is ignored in the spec.

            - If True, the bias vector of this layer is not ignored.
            - If False, the bias vector is ignored.

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

        See Also
        --------
        add_inner_product

def add_embedding(self, name, W, b, input_dim, output_channels, has_bias,
                      input_name, output_name):
        """
        Add an embedding layer to the model.

        Parameters
        ----------
        name: str
            The name of this layer
        W: numpy.array
            Weight matrix of shape (output_channels, input_dim).
        b: numpy.array
            Bias vector of shape (output_channels, ).
        input_dim: int
            Size of the vocabulary (1 + maximum integer index of the words).
        output_channels: int
            Number of output channels.
        has_bias: boolean
            Whether the bias vector of this layer is ignored in the spec.

            - If True, the bias vector of this layer is not ignored.
            - If False, the bias vector is ignored.

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

        See Also
        --------
        add_inner_product
        """

        spec = self.spec
        nn_spec = self.nn_spec

        # Add a new layer
        spec_layer = nn_spec.layers.add()
        spec_layer.name = name
        spec_layer.input.append(input_name)
        spec_layer.output.append(output_name)

        # Fill in the parameters
        spec_layer_params = spec_layer.embedding

        spec_layer_params.inputDim = input_dim
        spec_layer_params.outputChannels = output_channels
        spec_layer_params.hasBias = has_bias

        weights = spec_layer_params.weights
        weights.floatValue.extend(map(float, W.flatten()))
        if has_bias:
            bias = spec_layer_params.bias
            bias.floatValue.extend(map(float, b.flatten()))