[GitHub] wkcn opened a new issue #14030: The bug in MXTVMBridge

[GitBox <gi...@apache.org>]

wkcn opened a new issue #14030: The bug in MXTVMBridge
URL: https://github.com/apache/incubator-mxnet/issues/14030
 
 
   ## Description
   Hi, there.
   
   I would like to use `MXTVMBridge` to accelerate my project, but there is a flaky problem.
   The example works when MXNet is built from source by myself, but it doesn't work when MXNet is installed by PIP.
   
   ## Environment info (Required)
   
   ```
   ----------Python Info----------                                                                                                            
   Version      : 3.7.2                                                                                                                       
   Compiler     : GCC 8.2.1 20181127                                                                                                          
   Build        : ('default', 'Jan 10 2019 23:51:51')
   Arch         : ('64bit', '')
   ------------Pip Info-----------
   Version      : 18.1                                                                                                                        
   Directory    : /usr/lib/python3.7/site-packages/pip
   ----------MXNet Info-----------
   Version      : 1.5.0
   Directory    : /home/wkcn/proj/incubator-mxnet/python/mxnet
   Hashtag not found. Not installed from pre-built package.
   ----------System Info----------
   Platform     : Linux-4.20.5-arch1-1-ARCH-x86_64-with-arch
   system       : Linux
   node         : MiraiT
   release      : 4.20.5-arch1-1-ARCH
   version      : #1 SMP PREEMPT Sat Jan 26 12:59:18 UTC 2019
   ----------Hardware Info----------
   machine      : x86_64
   processor    :
   Architecture:        x86_64
   CPU op-mode(s):      32-bit, 64-bit
   Byte Order:          Little Endian
   Address sizes:       39 bits physical, 48 bits virtual
   CPU(s):              4
   On-line CPU(s) list: 0-3
   Thread(s) per core:  2
   Core(s) per socket:  2
   Socket(s):           1
   NUMA node(s):        1
   Vendor ID:           GenuineIntel
   CPU family:          6
   Model:               142
   Model name:          Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz
   Stepping:            9
   CPU MHz:             3500.069
   CPU max MHz:         3500.0000
   CPU min MHz:         400.0000
   BogoMIPS:            5810.00
   Virtualization:      VT-x
   L1d cache:           32K
   L1i cache:           32K
   L2 cache:            256K
   L3 cache:            4096K
   NUMA node0 CPU(s):   0-3
   Flags:               fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe
    syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni
    pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsa
   ve avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb invpcid_single pti tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_ad
   just bmi1 avx2 smep bmi2 erms invpcid mpx rdseed adx smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts hwp hwp
   _notify hwp_act_window hwp_epp
   ```
   
   Package used (Python/R/Scala/Julia):
   Python
   
   ## Build info (Required if built from source)
   
   Compiler (gcc/clang/mingw/visual studio): gcc
   
   MXNet commit hash: 
   e37ff53f0a3a0cc9276a7a1d4aff0deab91c40df
   
   Build config:
   `make -j 5 USE_OPENCV=0 USE_BLAS=openblas `
   
   ## Minimum reproducible example
   https://github.com/wkcn/test_tvm_bridge
   
   In this example, tvm_packed_func.h is simplyfied from TVM.
   
   ## Steps to reproduce
   
   1. clone the example
   2. change the path of libmxnet.so in the line 55 of the code.
   3. make
   4. ./test
   
   ## What have you tried to solve it?
   
   In the function [`SetMXTVMBridge`](https://github.com/wkcn/test_tvm_bridge/blob/master/test.cpp#L28) of the reproducible example,
   `args.num_args` is wrong and `args.values[0].v_str` is sometimes wrong when MXNet is installed by pip, namely `pip install mxnet --pre`.
   However, the result is correct when MXNet is built by myself, `make -j 5 USE_OPENCV=1 USE_BLAS=openblas` in the latest MXNet source.
   
   In the PR #9880,  merrymercy met a similar problem. https://github.com/apache/incubator-mxnet/pull/9880#issuecomment-421779923
   
   
   It seems the temporary variable `TVMArgs {"WrapAsyncCall", PackedFunc(mxnet::WrapAsyncCall)}` is released before calling `fregister` in the function [`MXTVMBridge`](https://github.com/apache/incubator-mxnet/blob/master/src/nnvm/tvm_bridge.cc#L178) because of optimization of compiler.
   
   Thanks!
   

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