Jupyter notebook doesn't load correctly all packages

[rparada]

I'm trying to run Weka on Jupyter Python (I have python 3.9). I've followed
these steps:

https://github.com/MuneebAhmedQureshi/Using-Weka-and-Python-for-Data-Mining-Jupyter-Notebook/blob/master/weka-from-mooks-graphs.ipynb

All packages were installed well. However, it looks not all packages in JN
were loaded correctly, this is the message I got after running
'jvm.start(packages=True) '


DEBUG:weka.core.jvm:Adding bundled jars
DEBUG:weka.core.jvm:Classpath=['C:\\Users\\cttc\\anaconda3\\lib\\site-packages\\javabridge\\jars\\rhino-1.7R4.jar',
'C:\\Users\\cttc\\anaconda3\\lib\\site-packages\\javabridge\\jars\\runnablequeue.jar',
'C:\\Users\\cttc\\anaconda3\\lib\\site-packages\\javabridge\\jars\\cpython.jar',
'C:\\Users\\cttc\\anaconda3\\lib\\site-packages\\weka\\lib\\python-weka-wrapper.jar',
'C:\\Users\\cttc\\anaconda3\\lib\\site-packages\\weka\\lib\\weka.jar']
DEBUG:weka.core.jvm:MaxHeapSize=default
DEBUG:weka.core.jvm:Package support enabled
---------------------------------------------------------------------------
JavaException                             Traceback (most recent call last)
<ipython-input-6-1e9aea12370a> in <module>
----> 1 jvm.start(packages=True)

~\anaconda3\lib\site-packages\weka\core\jvm.py in start(class_path, bundled,
packages, system_cp, max_heap_size, system_info)
    141         "Lweka/core/WekaPackageManager;", "loadPackages",
    142         "(Z)V",
--> 143         False)
    144
    145     # output system info

~\anaconda3\lib\site-packages\javabridge\jutil.py in static_call(class_name,
method_name, sig, *args)
    941     ret_sig = sig[sig.find(')')+1:]
    942     nice_args = get_nice_args(args, args_sig)
--> 943     result = fn(*nice_args)
    944     return get_nice_result(result, ret_sig)
    945

~\anaconda3\lib\site-packages\javabridge\jutil.py in fn(*args)
    921         jexception = env.exception_occurred()
    922         if jexception is not None:
--> 923             raise JavaException(jexception)
    924         return result
    925     return fn

JavaException: <Java object at 0x24dc40e8>

Consequently, I cannot load arff files since I get an error.

Note: I'm not running the jupyter on a virt env.

Any clue?



--
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[Peter Reutemann]

> I'm trying to run Weka on Jupyter Python (I have python 3.9). I've followed
> these steps:
>
> https://github.com/MuneebAhmedQureshi/Using-Weka-and-Python-for-Data-Mining-Jupyter-Notebook/blob/master/weka-from-mooks-graphs.ipynb
>
> All packages were installed well. However, it looks not all packages in JN
> were loaded correctly, this is the message I got after running
> 'jvm.start(packages=True) '
>
>
> DEBUG:weka.core.jvm:Adding bundled jars
> DEBUG:weka.core.jvm:Classpath=['C:\\Users\\cttc\\anaconda3\\lib\\site-packages\\javabridge\\jars\\rhino-1.7R4.jar',
> 'C:\\Users\\cttc\\anaconda3\\lib\\site-packages\\javabridge\\jars\\runnablequeue.jar',
> 'C:\\Users\\cttc\\anaconda3\\lib\\site-packages\\javabridge\\jars\\cpython.jar',
> 'C:\\Users\\cttc\\anaconda3\\lib\\site-packages\\weka\\lib\\python-weka-wrapper.jar',
> 'C:\\Users\\cttc\\anaconda3\\lib\\site-packages\\weka\\lib\\weka.jar']
> DEBUG:weka.core.jvm:MaxHeapSize=default
> DEBUG:weka.core.jvm:Package support enabled
> ---------------------------------------------------------------------------
> JavaException                             Traceback (most recent call last)
> <ipython-input-6-1e9aea12370a> in <module>
> ----> 1 jvm.start(packages=True)

[...]

> Note: I'm not running the jupyter on a virt env.

I do not recommend using Jupyter Notebooks in conjunction with the
python-weka-wrapper library. The underlying javabridge cannot restart
(or at least did for a very long time, haven't tested that recently)
the JVM within the same process, which would be the case when
re-running cells in Jupyter Notebooks.
Instead, just write your scripts in a simple text editor or an IDE
like PyCharm and execute your code from there. You can use the Python
interpreter from your existing virtual environment to execute your
code.

Cheers, Peter
--
Peter Reutemann
Dept. of Computer Science
University of Waikato, NZ
[phone]
http://www.cms.waikato.ac.nz/~fracpete/
http://www.data-mining.co.nz/
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