def process_index(index, intensity, interaction_symbol):
    """
    Process index to get edge tuple. Disregard edge weight.

    Args:
        index (str): index of the edge list dataframe.
        intensity (float): intensity of the edge.
        interaction_symbol (str): symbol used to separate node labels.

    Returns:
        tuple: a tuple containing edge labels.
    """
    return tuple(index.split(interaction_symbol))