Sample code to create silent permission failure in xgboost 0.4

xgboost_permission_fail.py

import xgboost as xgb
import numpy as np
from subprocess import call

# Initialize
X = np.random.normal(size=[10, 5])
y = np.random.randint(0,2,10)
dtrain = xgb.DMatrix(X, label=y)

# Model
param = {'max_depth':2, 'eta':1, 'silent':1, 'objective':'binary:logistic' }
num_round = 2
bst = xgb.train(param, dtrain, num_round)
print("Original Predictions: {}".format(bst.predict(dtrain)))

# Save and remove permissions
bst.save_model('my_booster.model')
call(['chmod','000', 'my_booster.model'])

# Load model into a new booster
bst2 = xgb.Booster()
bst2.load_model('my_booster.model')
print("Predictions reading from 000 mod file: {}".format(bst2.predict(dtrain)))