Created by: QiJune

I add

fluid.memory_optimize(fluid.default_main_program)

before executor run.

The error log is following:

Hit Cache !!!! cache pool index is 0, var name is ceil_0.tmp_0, cached var name is tmp_0, var shape is [1L]
Hit Cache !!!! cache pool index is 0, var name is fill_constant_0.tmp_0, cached var name is tmp_1, var shape is [1L]
Hit Cache !!!! cache pool index is 0, var name is tmp_3, cached var name is fill_constant_1.tmp_0, var shape is [1L]
Hit Cache !!!! cache pool index is 0, var name is tmp_4, cached var name is tmp_2, var shape is [1L]
Hit Cache !!!! cache pool index is 0, var name is tmp_6, cached var name is cast_0.tmp_0, var shape is [1L]
Hit Cache !!!! cache pool index is 0, var name is tmp_8, cached var name is tmp_5, var shape is [1L]
Hit Cache !!!! cache pool index is 0, var name is tmp_10, cached var name is tmp_7, var shape is [1L]
Hit Cache !!!! cache pool index is 0, var name is tmp_12, cached var name is tmp_9, var shape is [1L]
F
======================================================================
FAIL: test_decay (__main__.TestLearningRateDecay)
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Traceback (most recent call last):
  File "test_learning_rate_decay.py", line 149, in test_decay
    self.check_decay(py_decay_fn, fluid_decay_fn, kwargs)
  File "test_learning_rate_decay.py", line 105, in check_decay
    str(python_decayed_lr), str(lr_val[0])))
AssertionError: Failed fn is polynomial_decay, Python result is 1.0, Fluid result is nan

----------------------------------------------------------------------
Ran 1 test in 0.152s

FAILED (failures=1)