add TestEmptyPserverOptimizeBlocks

python/paddle/fluid/tests/unittests/test_dist_transpiler.py

@@ -405,6 +405,31 @@ class TestL2DecayWithPiecewise(TranspilerTest):
             ["sum", "scale", "scale", "elementwise_add", "momentum"])
 
 
+class TestEmptyPserverOptimizeBlocks(TranspilerTest):
+    def net_conf(self):
+        x = fluid.layers.data(name='x', shape=[1000], dtype='float32')
+        # only one parameter
+        y_predict = fluid.layers.fc(input=x,
+                                    size=1000,
+                                    act=None,
+                                    param_attr=fluid.ParamAttr(name='fc_w'),
+                                    bias_attr=False)
+        y = fluid.layers.data(name='y', shape=[1], dtype='float32')
+        cost = fluid.layers.square_error_cost(input=y_predict, label=y)
+        avg_cost = fluid.layers.mean(cost)
+        sgd_optimizer = fluid.optimizer.SGD(learning_rate=1.0)
+        sgd_optimizer.minimize(avg_cost)
+
+    def transpiler_test_impl(self):
+        config = fluid.DistributeTranspilerConfig()
+        config.slice_var_up = False
+
+        pserver, startup = self.get_pserver(ep=self.pserver2_ep, config=config)
+
+        self.assertEqual(len(pserver.blocks), 2)
+        self.assertEqual(len(pserver.blocks[1].ops), 0)
+
+
 class TestDistLookupTableBase(TranspilerTest):
     def network_with_table(self, is_sparse, is_distributed):
         self.table_size = 1000

python/paddle/fluid/transpiler/distribute_transpiler.py

@@ -35,6 +35,7 @@ import sys
 import numpy as np
 import collections
 import six
+import logging
 
 from .ps_dispatcher import RoundRobin, HashName, PSDispatcher
 from .. import core, framework
@@ -768,6 +769,7 @@ in a single call.")
                 lookup_table_var_name_to_block_id)
 
         if len(optimize_blocks) == 0:
+            logging.warn("pserver [" + str(endpoint) + "] has no optimize block!!")
             pre_block_idx = pserver_program.num_blocks - 1
             empty_block = pserver_program._create_block(pre_block_idx)
             optimize_blocks.append(empty_block)
@@ -1282,7 +1284,6 @@ to transpile() call.")
         }
         outputs = {"ParamOut": [param_var]}
         # only support sgd now
-        import logging
         logging.warn(
             "distribute lookup table only support sgd optimizer, change it's optimizer to sgd instead of "
             + table_opt_op.type)