g++ not available, if using conda: `conda install m2w64-toolchain`

Question

In duration of following these tutorial Neural net , on running test.py file , I am getting these exceptions and warnings .I had already tried previous suggestions but nothing has worked .

WARNING (theano.configdefaults): g++ not available, if using conda: `conda install m2w64-toolchain`
C:\ProgramData\Anaconda3\lib\site-packages\theano\configdefaults.py:560: UserWarning: DeprecationWarning: there is no c++ compiler.This is deprecated and with Theano 0.11 a c++ compiler will be mandatory
  warnings.warn("DeprecationWarning: there is no c++ compiler."
WARNING (theano.configdefaults): g++ not detected ! Theano will be unable to execute optimized C-implementations (for both CPU and GPU) and will default to Python implementations. Performance will be severely degraded. To remove this warning, set Theano flags cxx to an empty string.
WARNING (theano.tensor.blas): Using NumPy C-API based implementation for BLAS functions.

Any proper fix will be appreciated.

After trying with conda install m2w64-toolchain . Another error comes which says,

*You can find the C code in this temporary file: C:\Users\CERTAI~1\AppData\Local\Temp\theano_compilation_error_7bgw9_s9
Traceback (most recent call last):
  File "C:\ProgramData\Anaconda3\lib\site-packages\theano\gof\lazylinker_c.py", line 75, in <module>
    raise ImportError()
ImportError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\ProgramData\Anaconda3\lib\site-packages\theano\gof\lazylinker_c.py", line 92, in <module>
    raise ImportError()
ImportError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\shubhamprojectwork\all Work 2018\kaggle\DeepLearningPython35-master\DeepLearningPython35-master\test.py", line 156, in <module>
    import network3
  File "C:\shubhamprojectwork\all Work 2018\kaggle\DeepLearningPython35-master\DeepLearningPython35-master\network3.py", line 37, in <module>
    import theano
  File "C:\ProgramData\Anaconda3\lib\site-packages\theano\__init__.py", line 110, in <module>
    from theano.compile import (
  File "C:\ProgramData\Anaconda3\lib\site-packages\theano\compile\__init__.py", line 12, in <module>
    from theano.compile.mode import *
  File "C:\ProgramData\Anaconda3\lib\site-packages\theano\compile\mode.py", line 11, in <module>
    import theano.gof.vm
  File "C:\ProgramData\Anaconda3\lib\site-packages\theano\gof\vm.py", line 673, in <module>
    from . import lazylinker_c
  File "C:\ProgramData\Anaconda3\lib\site-packages\theano\gof\lazylinker_c.py", line 127, in <module>
    preargs=args)
  File "C:\ProgramData\Anaconda3\lib\site-packages\theano\gof\cmodule.py", line 2359, in compile_str
    (status, compile_stderr.replace('\n', '. ')))
Exception: Compilation failed (return status=1): C:\Users\CERTAI~1\AppData\Local\Temp\ccFdFXU1.o: In function `_import_array':
. C:/ProgramData/Anaconda3/lib/site-packages/numpy/core/include/numpy/__multiarray_api.h:1470: undefined reference to `__imp_PyExc_ImportError'
. C:/ProgramData/Anaconda3/lib/site-packages/numpy/core/include/numpy/__multiarray_api.h:1476: undefined reference to `__imp_PyExc_AttributeError'
. C:/ProgramData/Anaconda3/lib/site-packages/numpy/core/include/numpy/__multiarray_api.h:1481: undefined reference to `__imp_PyCapsule_Type'
. C:/ProgramData/Anaconda3/lib/site-packages/numpy/core/include/numpy/__multiarray_api.h:1482: undefined reference to `__imp_PyExc_RuntimeError'
. C:/ProgramData/Anaconda3/lib/site-packages/numpy/core/include/numpy/__multiarray_api.h:1497: undefined reference to `__imp_PyExc_RuntimeError'
. C:/ProgramData/Anaconda3/lib/site-packages/numpy/core/include/numpy/__multiarray_api.h:1505: undefined reference to `__imp_PyExc_RuntimeError'
. C:/ProgramData/Anaconda3/lib/site-packages/numpy/core/include/numpy/__multiarray_api.h:1511: undefined reference to `__imp_PyExc_RuntimeError'
. C:/ProgramData/Anaconda3/lib/site-packages/numpy/core/include/numpy/__multiarray_api.h:1521: undefined reference to `__imp_PyExc_RuntimeError'
. C:\Users\CERTAI~1\AppData\Local\Temp\ccFdFXU1.o:C:/ProgramData/Anaconda3/lib/site-packages/numpy/core/include/numpy/__multiarray_api.h:1533: more undefined references to `__imp_PyExc_RuntimeError' follow
. C:\Users\CERTAI~1\AppData\Local\Temp\ccFdFXU1.o: In function `NpyCapsule_Check':
. C:/ProgramData/Anaconda3/lib/site-packages/numpy/core/include/numpy/npy_3kcompat.h:456: undefined reference to `__imp_PyCapsule_Type'
. C:\Users\CERTAI~1\AppData\Local\Temp\ccFdFXU1.o: In function `unpack_list_of_ssize_t':
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:48: undefined reference to `__imp_PyExc_TypeError'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:58: undefined reference to `__imp_PyExc_IndexError'
. C:\Users\CERTAI~1\AppData\Local\Temp\ccFdFXU1.o: In function `CLazyLinker_init':
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:352: undefined reference to `__imp_PyExc_IndexError'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:370: undefined reference to `__imp_PyExc_IndexError'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:385: undefined reference to `__imp_PyExc_IndexError'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:389: undefined reference to `__imp_PyExc_IndexError'
. C:\Users\CERTAI~1\AppData\Local\Temp\ccFdFXU1.o:C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:393: more undefined references to `__imp_PyExc_IndexError' follow
. C:\Users\CERTAI~1\AppData\Local\Temp\ccFdFXU1.o: In function `CLazyLinker_init':
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:405: undefined reference to `__imp_PyExc_TypeError'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:420: undefined reference to `__imp__Py_NoneStruct'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:426: undefined reference to `__imp_PyExc_IndexError'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:440: undefined reference to `__imp_PyExc_TypeError'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:444: undefined reference to `__imp__Py_NoneStruct'
. C:\Users\CERTAI~1\AppData\Local\Temp\ccFdFXU1.o: In function `c_call':
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:545: undefined reference to `__imp__Py_NoneStruct'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:545: undefined reference to `__imp__Py_NoneStruct'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:545: undefined reference to `__imp__Py_NoneStruct'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:546: undefined reference to `__imp__Py_NoneStruct'
. C:\Users\CERTAI~1\AppData\Local\Temp\ccFdFXU1.o:C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:546: more undefined references to `__imp__Py_NoneStruct' follow
. C:\Users\CERTAI~1\AppData\Local\Temp\ccFdFXU1.o: In function `lazy_rec_eval':
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:618: undefined reference to `__imp_PyExc_IndexError'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:641: undefined reference to `__imp_PyExc_TypeError'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:649: undefined reference to `__imp_PyExc_ValueError'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:657: undefined reference to `__imp_PyExc_IndexError'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:708: undefined reference to `__imp__Py_NoneStruct'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:715: undefined reference to `__imp_PyExc_TypeError'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:721: undefined reference to `__imp_PyExc_TypeError'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:771: undefined reference to `__imp__Py_NoneStruct'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:771: undefined reference to `__imp__Py_NoneStruct'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:772: undefined reference to `__imp__Py_NoneStruct'
. C:\Users\CERTAI~1\AppData\Local\Temp\ccFdFXU1.o: In function `CLazyLinker_call':
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:814: undefined reference to `__imp_PyExc_RuntimeError'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:826: undefined reference to `__imp_PyExc_RuntimeError'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:839: undefined reference to `__imp__Py_NoneStruct'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:839: undefined reference to `__imp__Py_NoneStruct'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:840: undefined reference to `__imp__Py_NoneStruct'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:849: undefined reference to `__imp__Py_NoneStruct'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:849: undefined reference to `__imp__Py_NoneStruct'
. C:\Users\CERTAI~1\AppData\Local\Temp\ccFdFXU1.o:C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:850: more undefined references to `__imp__Py_NoneStruct' follow
. C:\Users\CERTAI~1\AppData\Local\Temp\ccFdFXU1.o: In function `CLazyLinker_call':
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:894: undefined reference to `__imp_PyExc_AssertionError'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:937: undefined reference to `__imp__Py_NoneStruct'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:937: undefined reference to `__imp__Py_NoneStruct'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:938: undefined reference to `__imp__Py_NoneStruct'
. C:\Users\CERTAI~1\AppData\Local\Temp\ccFdFXU1.o: In function `CLazyLinker_set_allow_gc':
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:973: undefined reference to `__imp_PyBool_Type'
. C:/Users/Certainty1/AppData/Local/Theano/compiledir_Windows-10-10.0.16299-SP0-Intel64_Family_6_Model_142_Stepping_9_GenuineIntel-3.6.1-64/lazylinker_ext/mod.cpp:976: undefined reference to `__imp__Py_TrueStruct'
. collect2.exe: error: ld returned 1 exit status
.* 

Answer 1

According to my personal experience, the successive error is caused by non- existence (or simply not found) of python*.dll for windows. You can solve this problem by 'conda install libpython'

Answer 2

I had the same error. On my PC I had python 3.6. I did this:
1. I uninstalled and reinstalled conda.
2. I created a environment using conda with python 3.5
3. installed m2w64-toolchain in the environment

And it worked!