Args:
        feature (any shape):

    Returns:
        2D head feature

def fastrcnn_2fc_head(feature):
    """
    Args:
        feature (any shape):

    Returns:
        2D head feature
    """
    dim = cfg.FPN.FRCNN_FC_HEAD_DIM
    init = tf.variance_scaling_initializer()
    hidden = FullyConnected('fc6', feature, dim, kernel_initializer=init, activation=tf.nn.relu)
    hidden = FullyConnected('fc7', hidden, dim, kernel_initializer=init, activation=tf.nn.relu)
    return hidden