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
21 lines
776 B
Python
Executable File
21 lines
776 B
Python
Executable File
#!/usr/bin/python
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import numpy as np
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import xgboost as xgb
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### load data in do training
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dtrain = xgb.DMatrix('../data/agaricus.txt.train')
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dtest = xgb.DMatrix('../data/agaricus.txt.test')
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param = {'max_depth':2, 'eta':1, 'silent':1, 'objective':'binary:logistic'}
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watchlist = [(dtest, 'eval'), (dtrain, 'train')]
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num_round = 3
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bst = xgb.train(param, dtrain, num_round, watchlist)
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print('start testing prediction from first n trees')
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### predict using first 1 tree
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label = dtest.get_label()
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ypred1 = bst.predict(dtest, ntree_limit=1)
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# by default, we predict using all the trees
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ypred2 = bst.predict(dtest)
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print('error of ypred1=%f' % (np.sum((ypred1 > 0.5) != label) / float(len(label))))
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print('error of ypred2=%f' % (np.sum((ypred2 > 0.5) != label) / float(len(label))))
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