Created by: zhupengyang

• fix input shape of op tests for sequence_expand, sequence_expand_as, squared_l2_distance, gather_nd, center_loss, rank_loss, conv_shift, spp, modified_huber_loss, smooth_l1_loss, multiplex, sequence_softmax, nce, huber_loss, group_norm, kldiv_loss, hinge_loss, expand_as
• fix https://github.com/PaddlePaddle/Paddle/pull/21391/files#r356043791