On my raspberry pi I created a virtual environment with the virtualenv package. Using pip3 I installed the following python packages for python 3.5:
imutils==0.5.2
numpy==1.16.3
opencv-contrib-python==3.4.2.17
picamera==1.13
scikit-learn==0.20.3
scipy==1.2.1
sklearn=0.0
Importing these packages in my python script results in an importerror due to the sklearn package
I recreated a new virtual environment from scratch and installed every package again with an older version of numpy as I read that numpy sometimes could be the problem, this was not succesful. Additionally, I created a virtualenv with python 3.6 and attempted to install the packages there but I ran into different errors such as failing to build the pip wheel.
Input:
(testenv) pi@raspberrypi:~/yetiborgv2/Project/opencv-face-recognition $ python3.5 test_face_script_python3.py
Output:
Libraries loaded
[INFO] loading face detector...
[INFO] loading face recognizer...
Traceback (most recent call last):
File "test_face_script_python3.py", line 40, in <module>
recognizer = pickle.loads(open(main_path + 'output/recognizer.pickle', "rb").read())
File "/home/pi/yetiborgv2/Project/opencv-face-recognition/testenv/lib/python3.5/site-packages/sklearn/svm/__init__.py", line 13, in <module>
from .classes import SVC, NuSVC, SVR, NuSVR, OneClassSVM, LinearSVC, \
File "/home/pi/yetiborgv2/Project/opencv-face-recognition/testenv/lib/python3.5/site-packages/sklearn/svm/classes.py", line 4, in <module>
from .base import _fit_liblinear, BaseSVC, BaseLibSVM
File "/home/pi/yetiborgv2/Project/opencv-face-recognition/testenv/lib/python3.5/site-packages/sklearn/svm/base.py", line 8, in <module>
from . import libsvm, liblinear
ImportError: /home/pi/yetiborgv2/Project/opencv-face-recognition/testenv/lib/python3.5/site-packages/sklearn/svm/liblinear.cpython-35m-arm-linux-gnueabihf.so: undefined symbol: cblas_dnrm2
I got this from ldd -r the .so file
pi@raspberrypi:~/yetiborgv2/Project/opencv-face-recognition/testenv/lib/python3.5/site-packages/sklearn/svm $ ldd -r liblinear.cpython-35m-arm-linux-gnueabihf.so
Output:
linear.cpython-35m-arm-linux-gnueabihf.so
/usr/lib/arm-linux-gnueabihf/libarmmem.so (0xb6f6f000)
libcblas.so.3 => /usr/lib/arm-linux-gnueabihf/libcblas.so.3 (0xb6efc000)
libstdc++.so.6 => /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 (0xb6db4000)
libm.so.6 => /lib/arm-linux-gnueabihf/libm.so.6 (0xb6d35000)
libgcc_s.so.1 => /lib/arm-linux-gnueabihf/libgcc_s.so.1 (0xb6d08000)
libpthread.so.0 => /lib/arm-linux-gnueabihf/libpthread.so.0 (0xb6cdf000)
libc.so.6 => /lib/arm-linux-gnueabihf/libc.so.6 (0xb6ba0000)
/lib/ld-linux-armhf.so.3 (0xb6fac000)
libf2c.so.2 => /usr/lib/arm-linux-gnueabihf/libf2c.so.2 (0xb6b77000)
undefined symbol: PyExc_ValueError (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyFrame_Type (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: _Py_TrueStruct (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyTuple_Type (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyList_Type (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyCapsule_Type (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: _Py_NoneStruct (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyExc_AttributeError (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyFunction_Type (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyCFunction_Type (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyExc_OverflowError (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyExc_NameError (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyExc_Exception (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyExc_DeprecationWarning (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyExc_RuntimeError (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyBaseObject_Type (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyExc_TypeError (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: _Py_FalseStruct (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyLong_Type (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyFloat_Type (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyExc_SystemError (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyExc_ImportError (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: _Py_CheckRecursionLimit (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyObject_Hash (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyObject_GetBuffer (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyLong_AsLong (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyLong_FromSsize_t (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyMem_Realloc (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: cblas_dnrm2 (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyObject_GetAttr (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyDict_GetItemString (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyImport_AddModule (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyObject_Call (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyUnicode_AsUnicode (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: cblas_ddot (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyTuple_Pack (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyErr_NormalizeException (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyObject_GetAttrString (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: cblas_daxpy (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyErr_Restore (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyModule_GetDict (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyTraceBack_Here (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyCode_New (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyDict_SetItem (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyErr_WarnEx (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyUnicode_InternFromString (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyTuple_New (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyObject_SetAttr (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyEval_RestoreThread (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyException_SetTraceback (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyDict_SetItemString (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyUnicode_FromFormat (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyBytes_FromStringAndSize (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyImport_GetModuleDict (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyDict_Next (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyErr_SetObject (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyBuffer_Release (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyBytes_FromString (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyErr_Format (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyFloat_AsDouble (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyMem_Malloc (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyErr_ExceptionMatches (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyCFunction_NewEx (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyList_New (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyImport_ImportModule (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: _PyObject_GetDictPtr (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyUnicode_FromString (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: Py_GetVersion (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyErr_Clear (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyModule_NewObject (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyOS_snprintf (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyDict_New (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyErr_SetString (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyThreadState_Get (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: _PyDict_GetItem_KnownHash (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: cblas_dscal (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyObject_SetAttrString (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyCapsule_GetPointer (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyObject_Not (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyUnicode_Decode (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyObject_GetItem (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: _Py_CheckRecursiveCall (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyEval_SaveThread (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyLong_FromLong (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyObject_IsTrue (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyErr_WarnFormat (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyLong_AsUnsignedLong (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyErr_Occurred (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyErr_Fetch (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyImport_ImportModuleLevelObject (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyFrame_New (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyDict_Size (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyEval_EvalFrameEx (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyUnicode_Compare (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyModuleDef_Init (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyErr_GivenExceptionMatches (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyEval_EvalCodeEx (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
undefined symbol: PyUnicode_FromStringAndSize (./liblinear.cpython-35m-arm-linux-gnueabihf.so)
EDIT (PARTIAL) SOLUTION!!!!:
After following these steps of the link below I managed to fix the scipy error, I uninstalled numpy, scipy and scikit-learn. Using apt-get install I installed the following things:
apt-get install libopenblas-base
apt-get install libopenblas-dev
apt-get install python-dev
apt-get install gcc
apt-get install gfortran
I then installed the lowest version of numpy needed with pip, and then installed scipy and scikit-learn. https://raspberrypi.stackexchange.com/questions/8308/how-to-install-latest-scipy-version-on-raspberry-pi
But then I run into another error that says the following without further detail:
Illegal instruction
How can I fix this?
