paddle exp计算出core （vsExp），浮点计算溢出？

[sdujq]

#0  0x00007fc79287b0c5 in vsexp_cout_rare () from /home/work/daijunkai/du-da/bin/../lib/libpaddle_capi_shared.so
#1  0x00007fc79287aa30 in mkl_vml_kernel_sExp_E9HAynn () from /home/work/daijunkai/du-da/bin/../lib/libpaddle_capi_shared.so
#2  0x00007fc7927ef110 in vsExp () from /home/work/daijunkai/du-da/bin/../lib/libpaddle_capi_shared.so
#3  0x00007fc792711a93 in paddle::CpuMatrix::softmax (this=<optimized out>, output=...)
    at /home/users/wangshuai21/dev_paddle/Paddle/paddle/math/Matrix.cpp:3389
#4  0x00007fc79262c11c in paddle::softmaxActivation::forward (this=<optimized out>, act=...)
    at /home/users/wangshuai21/dev_paddle/Paddle/paddle/gserver/activations/ActivationFunction.cpp:119
#5  0x00007fc792605c86 in paddle::Layer::forwardActivation (this=this@entry=0x7fc58d22f200)
    at /home/users/wangshuai21/dev_paddle/Paddle/paddle/gserver/layers/Layer.cpp:338
#6  0x00007fc7925e5378 in paddle::FullyConnectedLayer::forward (this=0x7fc58d22f200, passType=<optimized out>)
    at /home/users/wangshuai21/dev_paddle/Paddle/paddle/gserver/layers/FullyConnectedLayer.cpp:99
#7  0x00007fc792654d7c in paddle::NeuralNetwork::forward (this=0x7fc5a0a53010, inArgs=..., outArgs=0x7fbfe0205188, 
    passType=paddle::enumeration_wrapper::PASS_TEST)
    at /home/users/wangshuai21/dev_paddle/Paddle/paddle/gserver/gradientmachines/NeuralNetwork.cpp:248
#8  0x00007fc7924d0796 in paddle_gradient_machine_forward (machine=<optimized out>, inArgs=<optimized out>, 
    outArgs=<optimized out>, isTrain=<optimized out>)
    at /home/users/wangshuai21/dev_paddle/Paddle/paddle/capi/gradient_machine.cpp:81
#9  0x00007fc7954f3a4e in PaddleModel::predict (this=0x7fc060691aa0, features=..., modelResult=..., apolloInput=...)
    at src/paddle_model.cpp:200
#10 0x00007fc7954fe4d1 in BaseIntentDetector::detect (this=0x7fc05f6b5f20, features=..., detectorResult=..., apolloInput=...)
    at src/base_intent_detector.cpp:129
#11 0x00007fc7954e623c in IntentProcessor::process (this=0x7fc0cc287080, apolloInput=..., processerRet=..., 
    dict=0x7fc607576d00) at src/intent_processer.cpp:378
#12 0x00007fc7953fd129 in DaService::apollo_process (this=0xf06320) at ps/se/saiya/du-da/src/da_service.cpp:3297
#13 0x00007fc7953fe6e2 in DaService::fill_us_output (this=0xf06320, input=0x7fbff97995e0, output=0x7fc05a9f5180)
    at ps/se/saiya/du-da/src/da_service.cpp:3481
#14 0x00007fc7953fa603 in DaService::analyze (this=0xf06320, input=0x7fbff97995e0, output=0x7fc05a9f5180, 
    write_to_session=0x7fbfe0202120, write_to_user_info=0x7fc00e0fdec0) at ps/se/saiya/du-da/src/da_service.cpp:2884
#15 0x00007fc7953f40f3 in DaService::run (this=0xf06320, conf_name=...) at ps/se/saiya/du-da/src/da_service.cpp:1911
#16 0x00007fc797c769df in AcWorkServer::_parseApplication (this=this@entry=0xae1050, 
    read_data=read_data@entry=0x7fc0d40f7790, static_conf=static_conf@entry=0xa128c0, 
    plugin_manager=plugin_manager@entry=0xa3ca90) at ps/se/nlp-arch/rac/src/AcWorkServer.cpp:130
#17 0x00007fc797c76fb1 in AcWorkServer::run (this=0xae1050) at ps/se/nlp-arch/rac/src/AcWorkServer.cpp:725
#18 0x00000000004b6ae3 in rp::work_thread_run (arg=<optimized out>)
    at ps/se/nlp-arch/service-common/server/src/work_thread_run.cpp:108
#19 0x0000003f0b90610a in start_thread () from /lib64/tls/libpthread.so.0
#20 0x0000003f0b0c5ee3 in clone () from /lib64/tls/libc.so.6

[hedaoyuan]

@sdujq 调用栈看起来是已经走到MKL函数mkl_vml_kernel_sExp_E9HAynn里面，出错异常是什么（如果是浮点异常的话会有一个SIGFPE）？我会check一下什么样的数据会导致MKL函数vsExp异常，另外，你那有可以复现的环境吗？

[sdujq]

对有sigfpe
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/tls/libthread_db.so.1".
Core was generated by `/home/work/daijunkai/du-da/bin/./rac -d ../conf/ -f rac.conf'.
Program terminated with signal SIGFPE, Arithmetic exception.
#0 0x00007fc79287b0c5 in vsexp_cout_rare () from /home/work/daijunkai/du-da/bin/../lib/libpaddle_capi_shared.so
[Current thread is 1 (Thread 0x7fc0e4af4960 (LWP 32104))

[hedaoyuan]

浮点异常的原因是，在调用vsExp的参数中出现了过大的值或者非法值，并且在capi的initPaddle里面设置了异常捕获feenableexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW);。
@sdujq 如果要准确定义是什么原因导致的vsExp参数中出现了过大值或非法值，需要能够复现环境，定位具体是什么异常（溢出、除零、非法值等）。如果，期望的是程序稳定，不要core的话，可以去掉initPaddle中的对浮点异常的捕获的语句就行了。

[hedaoyuan]

@sdujq The issue has been closed by PR # 2043. If there are other problems, you can Reopen and comment.