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模型报错退出

Created by: yuanghbdbj

采用5000图片用image_classification示例程序训练alexnet模型（二分类），报错退出（200样本【非5000子集】成功跑完70轮）

1、报错如下：

Pass 0, Batch 3, Cost 20.500000, {'classification_error_evaluator': 0.3203125}
Thread [139688770483968] Forwarding __fc_layer_2__,
*** Aborted at 1519981919 (unix time) try "date -d @1519981919" if you are using GNU date ***
] Forwarding __fc_layer_2__,
*** Aborted at 1519981919 (unix time) try "date -d @1519981919" if you are using GNU date ***
PC: @                0x0 (unknown)
*** SIGFPE (@0x7f0b855a784e) received by PID 58007 (TID 0x7f0bd38b3700) from PID 18446744071651883086; stack trace: ***
    @       0x318b20f500 (unknown)
    @     0x7f0b855a784e sgemm_kernel_SANDYBRIDGE

Floating point exception(core dumped)

2、添加error_clipping_threshold参数未有效解决 default