diff --git a/python/paddle/fluid/layers/nn.py b/python/paddle/fluid/layers/nn.py
index a546864f5c3f95abdb35b522fa08387bc7eca288..0c918cf677b80b2deb64106159e11ac97cd2fd02 100644
--- a/python/paddle/fluid/layers/nn.py
+++ b/python/paddle/fluid/layers/nn.py
@@ -10695,13 +10695,11 @@ def npair_loss(anchor, positive, labels, l2_reg=0.002):
     labels = reshape(labels, shape=[batch_size, 1], inplace=True)
     labels = expand(labels, expand_times=[1, batch_size])
 
-    labels = control_flow.equal(
-        labels, transpose(
-            labels, perm=[1, 0])).astype('float32')
+    labels = equal(labels, transpose(labels, perm=[1, 0])).astype('float32')
     labels = labels / reduce_sum(labels, dim=1, keep_dim=True)
 
-    l2loss = reduce_mean(reduce_sum(ops.square(anchor), 1)) \
-             + reduce_mean(reduce_sum(ops.square(positive), 1))
+    l2loss = reduce_mean(reduce_sum(square(anchor), 1)) \
+             + reduce_mean(reduce_sum(square(positive), 1))
     l2loss = l2loss * Beta * l2_reg
 
     similarity_matrix = matmul(