91af8f7106
* Some minor changes to the code style Some minor changes to the code style in file basic_walkthrough.py * coding style changes * coding style changes arrcording PEP8 * Update basic_walkthrough.py
26 lines
886 B
Python
Executable File
26 lines
886 B
Python
Executable File
#!/usr/bin/python
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import numpy as np
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import scipy.sparse
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import xgboost as xgb
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### simple example for using external memory version
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# this is the only difference, add a # followed by a cache prefix name
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# several cache file with the prefix will be generated
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# currently only support convert from libsvm file
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dtrain = xgb.DMatrix('../data/agaricus.txt.train#dtrain.cache')
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dtest = xgb.DMatrix('../data/agaricus.txt.test#dtest.cache')
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# specify validations set to watch performance
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param = {'max_depth':2, 'eta':1, 'silent':1, 'objective':'binary:logistic'}
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# performance notice: set nthread to be the number of your real cpu
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# some cpu offer two threads per core, for example, a 4 core cpu with 8 threads, in such case set nthread=4
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#param['nthread']=num_real_cpu
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watchlist = [(dtest, 'eval'), (dtrain, 'train')]
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num_round = 2
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bst = xgb.train(param, dtrain, num_round, watchlist)
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