def get_edge_label(layer):
    """Define edge label based on layer type.
    """
    if layer.type == 'Data':
        edge_label = 'Batch ' + str(layer.data_param.batch_size)
    elif layer.type == 'Convolution' or layer.type == 'Deconvolution':
        edge_label = str(layer.convolution_param.num_output)
    elif layer.type == 'InnerProduct':
        edge_label = str(layer.inner_product_param.num_output)
    else:
        edge_label = '""'
    return edge_label
