Convert concat layer from mxnet to coreml.

    Parameters
    ----------
    network: net
        A mxnet network object.

    layer: node
        Node to convert.

    module: module
        An module for MXNet

    builder: NeuralNetworkBuilder
        A neural network builder object.

def convert_concat(net, node, module, builder):
    """Convert concat layer from mxnet to coreml.

    Parameters
    ----------
    network: net
        A mxnet network object.

    layer: node
        Node to convert.

    module: module
        An module for MXNet

    builder: NeuralNetworkBuilder
        A neural network builder object.
    """
    # Get input and output names
    input_names, output_name = _get_input_output_name(net, node, 'all')
    name = node['name']
    mode = 'CONCAT'
    builder.add_elementwise(name = name, input_names = input_names,
            output_name = output_name, mode = mode)