def convert_pooling(net, node, module, builder):
    """Convert a pooling 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.
    """
    input_name, output_name = _get_input_output_name(net, node)
    name = node['name']
    param = _get_attrs(node)

    layer_type_mx = param['pool_type']
    if layer_type_mx == 'max':
        layer_type = 'MAX'
    elif layer_type_mx == 'avg':
        layer_type = 'AVERAGE'
    else:
        raise TypeError("Pooling type %s not supported" % layer_type_mx)

    # Add padding if there is any
    if 'pad' in param.keys() and literal_eval(param['pad']) != (0, 0):
        pad = literal_eval(param['pad'])
        builder.add_padding(
            name=name+"_pad",
            left=pad[1],
            right=pad[1],
            top=pad[0],
            bottom=pad[0],
            value=0,
            input_name=input_name,
            output_name=name+"_pad_output")
        input_name = name+"_pad_output"

    stride_height = 1
    stride_width = 1
    if 'stride' in param.keys():
        stride_height, stride_width = literal_eval(param['stride'])

    kernel_width, kernel_height = literal_eval(param['kernel'])

    type_map = {'valid': 'VALID', 'full': 'INCLUDE_LAST_PIXEL'}
    padding_type = param['pooling_convention'] if 'pooling_convention' in param else 'valid'
    if padding_type not in type_map:
        raise KeyError("%s type is not supported in this converter. It is a Github issue.")
    padding_type = type_map[padding_type]

    if 'global_pool' in param.keys():
        is_global = literal_eval(param['global_pool'])
    else:
        is_global = False

    # For reasons why we are not using the standard builder but having our own implementation,
    # see the function documentation.
    _add_pooling.add_pooling_with_padding_types(
        builder=builder,
        name=name,
        height=kernel_height,
        width=kernel_width,
        stride_height=stride_height,
        stride_width=stride_width,
        layer_type=layer_type,
        padding_type=padding_type,
        exclude_pad_area=False,
        is_global=is_global,
        input_name=input_name,
        output_name=output_name
    )
Convert a pooling 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.