test=develop, fix embeding distribute and sparse can't be true and the same time

python/paddle/fluid/layers/nn.py

@@ -336,7 +336,7 @@ def embedding(input,
     """
 
     helper = LayerHelper('embedding', **locals())
-    remote_prefetch = is_sparse
+    remote_prefetch = is_sparse and (not is_distributed)
     if remote_prefetch:
         assert is_sparse is True and is_distributed is False
     w = helper.create_parameter(