When I run from PyFastBDT import FastBDT in a Jupyter Notebook it gives the following,

OSError                                   Traceback (most recent call last)
<ipython-input-8-fa8af2d7e581> in <module>()
----> 1 from PyFastBDT import FastBDT

/usr/local/lib/python3.5/dist-packages/PyFastBDT/FastBDT.py in <module>()
     16 #FastBDT_library = ctypes.cdll.LoadLibrary(FastBDT_library_path)
     17 
---> 18 FastBDT_library =  ctypes.cdll.LoadLibrary(os.getcwd() + '/libFastBDT_CInterface.so')
     19 print('Loaded ', FastBDT_library)
     20 

/usr/lib/python3.5/ctypes/__init__.py in LoadLibrary(self, name)
    423 
    424     def LoadLibrary(self, name):
--> 425         return self._dlltype(name)
    426 
    427 cdll = LibraryLoader(CDLL)

/usr/lib/python3.5/ctypes/__init__.py in __init__(self, name, mode, handle, use_errno, use_last_error)
    345 
    346         if handle is None:
--> 347             self._handle = _dlopen(self._name, mode)
    348         else:
    349             self._handle = handle

OSError: /home/josh/Documents/Python Scripts/libFastBDT_CInterface.so: cannot open shared object file: No such file or directory

Is there something that can be run prior to starting up the jupyter notebook or in the notebook the will allow this to import?

Hi Thomas, we see your nice paper of FastBDT, and glad to see the speed up factor from your method. On XGBoost github, we have an open issue for discussing the methodology and the benchmark with technical details dmlc/xgboost#1604 can you take a look and we can discuss about potential improvement for both FastBDT and xgboost? Thanks.

Hi,
Sorry if it is a simple error but I need some help. I am trying to import FastBDT in my file but it doesn't work. I am on Windows 7 with python 3.6

• I have downloaded cmake then run 'cmake .' in the terminal and got some new files, as we can see on the image below. (I don't know if it was even necessary to do this if I only want to use this library in python). I also got a small error saying that it could not find GTest.

• Then in this same directory in the terminal I have run the command 'python3 setup.py.in install'
• Finally when I try to run the example code an error arrives, print screen below.

Does anyone know how to solve this problem please?
Thank you

PS: it's my first issue post, sorry if it is not well written

FileNotFoundError: Could not find module 'E:\360MoveData\Users\Administrator\Desktop\FastBDT-master\PyFastBDT*libFastBDT_CInterface.so'* (or one of its dependencies). Try using the full path with constructor syntax.

My first attempt to compile got errors like this:
Building CXX object CMakeFiles/FastBDT_static.dir/src/FastBDT.cxx.o
In file included from /home/msevior/Dropbox/FastBDT_github/FastBDT/src/FastBDT.cxx:5:
/home/msevior/Dropbox/FastBDT_github/FastBDT/include/FastBDT.h: In member function ‘Value FastBDT::FeatureBinning::BinToValue(unsigned int) const’:
/home/msevior/Dropbox/FastBDT_github/FastBDT/include/FastBDT.h:215:28: error: ‘numeric_limits’ is not a member of ‘std’
215 | return -std::numeric_limits::infinity();
....
This was very simply fixed by adding..

#include <limits>

To FastBDT.h

Now it compiles with 0 errors

Please make this minor change...

When calculating AUC of ROC, most people use false positve and true positve as their axises. From my understanding, efficiency corresponds to true positve but purity does not match to 1 - false positive.

purity = true signals that passed the cut / events that passed the cut
1 - false positive = true backgrounds that failed the cut / true backgrounds

The consequence is that the ROC curve of efficiency and purity does not start and end at the diagonal points. Is my understanding correct?