def convert_softmax(builder, layer, input_names, output_names, keras_layer):
    """Convert a softmax layer from keras to coreml.

    Parameters
    keras_layer: layer
    ----------
        A keras layer object.

    builder: NeuralNetworkBuilder
        A neural network builder object.
    """
    input_name, output_name = input_names[0], output_names[0]
    builder.add_softmax(name=layer, input_name=input_name, output_name=
        output_name)
