Check failed: sign == true (0 vs. 1)

[wenyu-z]

Environment info

Operating System: macOS Sierra

Compiler: spyder

Package used (python/R/jvm/C++): python

xgboost version used: 0.72

1. The python version and distribution
   Python 2.7.14 :: Anaconda custom (64-bit)
2. The command to install xgboost if you are not installing from source
   brew install gcc5
   pip install xgboost

Steps to reproduce

I was using the sample code to try it out

import xgboost as xgb
try:
    # read in data
    dtrain = xgb.DMatrix('agaricus_train.txt')
    dtest = xgb.DMatrix('agaricus_test.txt')
    # specify parameters via map
    param = {'max_depth':2, 'eta':1, 'silent':1, 'objective':'binary:logistic' }
    num_round = 2
    bst = xgb.train(param, dtrain, num_round)
    # make prediction
    preds = bst.predict(dtest)

except Exception as e:
    print e

Error Received:

[17:10:37] src/data/././strtonum.h:141: Check failed: sign == true (0 vs. 1) 

Stack trace returned 2 entries:
[bt] (0) 0   libxgboost.dylib                    0x0000001a15606683 dmlc::StackTrace[abi:cxx11]() + 67
[bt] (1) 1   libstdc++.6.dylib                   0x0000001a15a85ce0 vtable for std::__cxx11::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> > + 16

What have you tried?

I wasn't sure if it was multithreading's problem, so I used the code at https://machinelearningmastery.com/develop-first-xgboost-model-python-scikit-learn/, to use make -j4. But it resulted in another error.

[hcho3]

I was unable to re-produce the problem with the official release 0.72. Can you post the content of agaricus_train.txt? Make sure that the file is a valid LibSVM format.

[wenyu-z]

Hi @hcho3

agaricus_train.txt
The files are agaricus.txt.train and agaricus.txt.test under /demo/data in the repo. I just renamed them.

[hcho3]

When I opened the file you just posted, I saw bunch of HTML tags. Get the files in raw form and try again.
https://raw.githubusercontent.com/dmlc/xgboost/master/demo/data/agaricus.txt.train
https://raw.githubusercontent.com/dmlc/xgboost/master/demo/data/agaricus.txt.test

[wenyu-z]

@hcho3 thanks, that solved it! I must've messed something up when I was handling the files