output "get no rate" from grid.py of libsvm - libsvm

Question

I have downloaded libsvm-3.17 package. Extracted the files. I go to 'tools' folder to try using grid.py to look for suitable c and g with the dataset provided in the package, i.e. heart_scale.
However, the following is what I get
Traceback (most recent call last):
File "C:...\Documents\libsvm-3.17\tools\grid.py", line 266, in run
if rate is None: raise RuntimeError('get no rate')
RuntimeError: get no rate
worker local quit.
Can someone help me figure out how to solve this problem.
Thank you very much.

Answer 1

You may need to scale the data in advance. I got the same problem and it sorted out after I scaled the data. Hope this help.

Answer 2

Firstly, if you are a newbie in libsvm, I would recommend you to try easy.py instead of grid.py. Secondly, before executing anything you have to compile libsvm, for compiling follow instructions given in README file (You must ensure nmake.exe, cl.exe, link.exe are in system path), here is what it says:
Windows binaries are in the directory `windows'. To build them via
Visual C++, use the following steps:
Open a DOS command box (or Visual Studio Command Prompt) and change to libsvm directory. If environment variables of VC++ have not
been set, type
"C:\Program Files\Microsoft Visual Studio 10.0\VC\bin\vcvars32.bat"
You may have to modify the above command according which version of
VC++ or where it is installed.
Type
nmake -f Makefile.win clean all
(optional) To build shared library libsvm.dll, type
nmake -f Makefile.win lib
Another way is to build them from Visual C++ environment. See details
in libsvm FAQ.
Once you have it installed you can start working with easy.py and grid.py.

Answer 3

This is what I tried on both a 64 bit and a 32 bit machine and grid.py works fine.
I have added the default install directories, if your installation directories are different modify accordingly.
Open command prompt and type
C:\Program Files (x86)\Microsoft Visual Studio xx\VC\bin\amd64\vcvars64.bat for 64 bit systems
OR C:\Program Files (x86)\Microsoft Visual Studio xx\VC\bin\vcvars32.bat for 32 bit systems.
Navigate to libsvm directory in the same command prompt and run
C:\Program Files (x86)\Microsoft Visual Studio xx\VC\bin\amd64\nmake.exe -f Makefile.win for 64 bit systems
OR C:\Program Files (x86)\Microsoft Visual Studio xx\VC\bin\nmake.exe -f Makefile.win for 32 bit systems
The binaries should be built successfully in the libsvm-3.xx\windows folder
Run grid.py with your options
Within grid.py the gnuplot.exe is usually set at tmp which never worked for me so I changed the gnuplot executable path in my grid.py to the following:
self.gnuplot_pathname = r'C:\\Program Files (x86)\\gnuplot\\bin\\pgnuplot.exe'

Answer 4

If you use the option -log2p to run grid.py, you will get output get no rate. With grid.py, you can't use -log2p option.(No matches for searching -log2p in grid.py)
You can use -log2p option in gridregression.py.