Created by: hutuxian

embedding op的padding_idx这个attr是支持int64类型的，但是当传入参数大于2^31-1时，会出错。下面是一个demo网络，可以通过打印出的main_program看到op中的padding_idx变成了非预期值。

import paddle.fluid as fluid
import numpy as np
import paddle.fluid.layers as layers

x = fluid.layers.data(name="x", shape=[1], dtype='int64', lod_level=1)
layers.Print(x)

emb = fluid.layers.embedding(input=x, size=[10**10+10,1], dtype='float32', padding_idx=10**10L)
layers.Print(emb)

place = fluid.CPUPlace()
exe = fluid.Executor(place)

with open("main_program", "w") as fout:
    fout.write(str(fluid.default_main_program()))
exe.run(fluid.default_startup_program())

x = np.array([10**10+1, 10**10+5]).reshape((-1,1)).astype("int64")
xx = fluid.LoDTensor()
xx.set(x, place)
xx.set_lod([[0,1,2]])
res = exe.run(
        feed={'x':xx},
        fetch_list=[],
        return_numpy=False)