replace matmul to matmul_v2, expand to expand_v2

python/paddle/fluid/layers/loss.py

@@ -1717,7 +1717,7 @@ def npair_loss(anchor, positive, labels, l2_reg=0.002):
     batch_size = labels.shape[0]
 
     labels = nn.reshape(labels, shape=[batch_size, 1])
-    labels = nn.expand(labels, expand_times=[1, batch_size])
+    labels = paddle.tile(labels, repeat_times=[1, batch_size])
 
     labels = equal(labels, nn.transpose(labels, perm=[1, 0])).astype('float32')
     labels = labels / nn.reduce_sum(labels, dim=1, keep_dim=True)
@@ -1726,7 +1726,7 @@ def npair_loss(anchor, positive, labels, l2_reg=0.002):
              + nn.reduce_mean(nn.reduce_sum(square(positive), 1))
     l2loss = l2loss * Beta * l2_reg
 
-    similarity_matrix = nn.matmul(
+    similarity_matrix = paddle.matmul(
         anchor, positive, transpose_x=False, transpose_y=True)
     softmax_ce = softmax_with_cross_entropy(
         logits=similarity_matrix, label=labels, soft_label=True)