342 lines
12 KiB
Python
342 lines
12 KiB
Python
# -*- coding: utf-8 -*-
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import os
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import tempfile
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import numpy as np
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import xgboost as xgb
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import scipy.sparse
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import pytest
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from scipy.sparse import rand, csr_matrix
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import testing as tm
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rng = np.random.RandomState(1)
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dpath = 'demo/data/'
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rng = np.random.RandomState(1994)
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class TestDMatrix:
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def test_warn_missing(self):
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from xgboost import data
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with pytest.warns(UserWarning):
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data._warn_unused_missing('uri', 4)
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with pytest.warns(None) as record:
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data._warn_unused_missing('uri', None)
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data._warn_unused_missing('uri', np.nan)
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assert len(record) == 0
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with pytest.warns(None) as record:
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x = rng.randn(10, 10)
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y = rng.randn(10)
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xgb.DMatrix(x, y, missing=4)
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assert len(record) == 0
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with pytest.warns(UserWarning):
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csr = csr_matrix(x)
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xgb.DMatrix(csr.tocsc(), y, missing=4)
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def test_dmatrix_numpy_init(self):
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data = np.random.randn(5, 5)
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dm = xgb.DMatrix(data)
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assert dm.num_row() == 5
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assert dm.num_col() == 5
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data = np.array([[1, 2], [3, 4]])
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dm = xgb.DMatrix(data)
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assert dm.num_row() == 2
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assert dm.num_col() == 2
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# 0d array
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with pytest.raises(ValueError):
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xgb.DMatrix(np.array(1))
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# 1d array
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with pytest.raises(ValueError):
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xgb.DMatrix(np.array([1, 2, 3]))
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# 3d array
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data = np.random.randn(5, 5, 5)
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with pytest.raises(ValueError):
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xgb.DMatrix(data)
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# object dtype
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data = np.array([['a', 'b'], ['c', 'd']])
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with pytest.raises(ValueError):
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xgb.DMatrix(data)
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def test_csr(self):
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indptr = np.array([0, 2, 3, 6])
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indices = np.array([0, 2, 2, 0, 1, 2])
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data = np.array([1, 2, 3, 4, 5, 6])
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X = scipy.sparse.csr_matrix((data, indices, indptr), shape=(3, 3))
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dtrain = xgb.DMatrix(X)
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assert dtrain.num_row() == 3
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assert dtrain.num_col() == 3
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def test_csc(self):
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row = np.array([0, 2, 2, 0, 1, 2])
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col = np.array([0, 0, 1, 2, 2, 2])
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data = np.array([1, 2, 3, 4, 5, 6])
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X = scipy.sparse.csc_matrix((data, (row, col)), shape=(3, 3))
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dtrain = xgb.DMatrix(X)
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assert dtrain.num_row() == 3
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assert dtrain.num_col() == 3
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def test_coo(self):
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row = np.array([0, 2, 2, 0, 1, 2])
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col = np.array([0, 0, 1, 2, 2, 2])
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data = np.array([1, 2, 3, 4, 5, 6])
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X = scipy.sparse.coo_matrix((data, (row, col)), shape=(3, 3))
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dtrain = xgb.DMatrix(X)
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assert dtrain.num_row() == 3
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assert dtrain.num_col() == 3
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def test_np_view(self):
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# Sliced Float32 array
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y = np.array([12, 34, 56], np.float32)[::2]
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from_view = xgb.DMatrix(np.array([[]]), label=y).get_label()
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from_array = xgb.DMatrix(np.array([[]]), label=y + 0).get_label()
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assert (from_view.shape == from_array.shape)
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assert (from_view == from_array).all()
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# Sliced UInt array
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z = np.array([12, 34, 56], np.uint32)[::2]
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dmat = xgb.DMatrix(np.array([[]]))
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dmat.set_uint_info('group', z)
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from_view = dmat.get_uint_info('group_ptr')
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dmat = xgb.DMatrix(np.array([[]]))
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dmat.set_uint_info('group', z + 0)
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from_array = dmat.get_uint_info('group_ptr')
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assert (from_view.shape == from_array.shape)
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assert (from_view == from_array).all()
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def test_slice(self):
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X = rng.randn(100, 100)
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y = rng.randint(low=0, high=3, size=100).astype(np.float32)
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d = xgb.DMatrix(X, y)
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np.testing.assert_equal(d.get_label(), y)
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fw = rng.uniform(size=100).astype(np.float32)
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d.set_info(feature_weights=fw)
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# base margin is per-class in multi-class classifier
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base_margin = rng.randn(100, 3).astype(np.float32)
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d.set_base_margin(base_margin.flatten())
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ridxs = [1, 2, 3, 4, 5, 6]
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sliced = d.slice(ridxs)
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# Slicing works with label and other meta info fields
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np.testing.assert_equal(sliced.get_label(), y[1:7])
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np.testing.assert_equal(sliced.get_float_info('feature_weights'), fw)
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np.testing.assert_equal(sliced.get_base_margin(), base_margin[1:7, :].flatten())
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np.testing.assert_equal(sliced.get_base_margin(), sliced.get_float_info('base_margin'))
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# Slicing a DMatrix results into a DMatrix that's equivalent to a DMatrix that's
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# constructed from the corresponding NumPy slice
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d2 = xgb.DMatrix(X[1:7, :], y[1:7])
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d2.set_base_margin(base_margin[1:7, :].flatten())
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eval_res = {}
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_ = xgb.train(
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{'num_class': 3, 'objective': 'multi:softprob',
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'eval_metric': 'mlogloss'},
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d,
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num_boost_round=2, evals=[(d2, 'd2'), (sliced, 'sliced')], evals_result=eval_res)
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np.testing.assert_equal(eval_res['d2']['mlogloss'], eval_res['sliced']['mlogloss'])
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ridxs_arr = np.array(ridxs)[1:] # handles numpy slice correctly
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sliced = d.slice(ridxs_arr)
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np.testing.assert_equal(sliced.get_label(), y[2:7])
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def test_feature_names_slice(self):
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data = np.random.randn(5, 5)
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# different length
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with pytest.raises(ValueError):
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xgb.DMatrix(data, feature_names=list('abcdef'))
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# contains duplicates
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with pytest.raises(ValueError):
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xgb.DMatrix(data, feature_names=['a', 'b', 'c', 'd', 'd'])
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# contains symbol
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with pytest.raises(ValueError):
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xgb.DMatrix(data, feature_names=['a', 'b', 'c', 'd', 'e<1'])
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dm = xgb.DMatrix(data)
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dm.feature_names = list('abcde')
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assert dm.feature_names == list('abcde')
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assert dm.slice([0, 1]).num_col() == dm.num_col()
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assert dm.slice([0, 1]).feature_names == dm.feature_names
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dm.feature_types = 'q'
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assert dm.feature_types == list('qqqqq')
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dm.feature_types = list('qiqiq')
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assert dm.feature_types == list('qiqiq')
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with pytest.raises(ValueError):
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dm.feature_types = list('abcde')
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# reset
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dm.feature_names = None
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assert dm.feature_names is None
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assert dm.feature_types is None
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def test_feature_names(self):
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data = np.random.randn(100, 5)
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target = np.array([0, 1] * 50)
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cases = [['Feature1', 'Feature2', 'Feature3', 'Feature4', 'Feature5'],
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[u'要因1', u'要因2', u'要因3', u'要因4', u'要因5']]
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for features in cases:
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dm = xgb.DMatrix(data, label=target,
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feature_names=features)
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assert dm.feature_names == features
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assert dm.num_row() == 100
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assert dm.num_col() == 5
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params = {'objective': 'multi:softprob',
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'eval_metric': 'mlogloss',
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'eta': 0.3,
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'num_class': 3}
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bst = xgb.train(params, dm, num_boost_round=10)
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scores = bst.get_fscore()
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assert list(sorted(k for k in scores)) == features
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dummy = np.random.randn(5, 5)
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dm = xgb.DMatrix(dummy, feature_names=features)
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bst.predict(dm)
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# different feature name must raises error
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dm = xgb.DMatrix(dummy, feature_names=list('abcde'))
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with pytest.raises(ValueError):
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bst.predict(dm)
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@pytest.mark.skipif(**tm.no_pandas())
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def test_save_binary(self):
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import pandas as pd
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with tempfile.TemporaryDirectory() as tmpdir:
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path = os.path.join(tmpdir, 'm.dmatrix')
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data = pd.DataFrame({
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"a": [0, 1],
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"b": [2, 3],
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"c": [4, 5]
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})
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m0 = xgb.DMatrix(data.loc[:, ["a", "b"]], data["c"])
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assert m0.feature_names == ['a', 'b']
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m0.save_binary(path)
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m1 = xgb.DMatrix(path)
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assert m0.feature_names == m1.feature_names
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assert m0.feature_types == m1.feature_types
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def test_get_info(self):
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dtrain = xgb.DMatrix(dpath + 'agaricus.txt.train')
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dtrain.get_float_info('label')
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dtrain.get_float_info('weight')
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dtrain.get_float_info('base_margin')
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dtrain.get_uint_info('group_ptr')
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def test_qid(self):
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rows = 100
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cols = 10
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X, y = rng.randn(rows, cols), rng.randn(rows)
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qid = rng.randint(low=0, high=10, size=rows, dtype=np.uint32)
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qid = np.sort(qid)
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Xy = xgb.DMatrix(X, y)
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Xy.set_info(qid=qid)
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group_ptr = Xy.get_uint_info('group_ptr')
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assert group_ptr[0] == 0
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assert group_ptr[-1] == rows
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def test_feature_weights(self):
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kRows = 10
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kCols = 50
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rng = np.random.RandomState(1994)
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fw = rng.uniform(size=kCols)
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X = rng.randn(kRows, kCols)
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m = xgb.DMatrix(X)
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m.set_info(feature_weights=fw)
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np.testing.assert_allclose(fw, m.get_float_info('feature_weights'))
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# Handle empty
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m.set_info(feature_weights=np.empty((0, 0)))
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assert m.get_float_info('feature_weights').shape[0] == 0
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fw -= 1
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with pytest.raises(ValueError):
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m.set_info(feature_weights=fw)
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def test_sparse_dmatrix_csr(self):
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nrow = 100
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ncol = 1000
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x = rand(nrow, ncol, density=0.0005, format='csr', random_state=rng)
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assert x.indices.max() < ncol - 1
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x.data[:] = 1
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dtrain = xgb.DMatrix(x, label=rng.binomial(1, 0.3, nrow))
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assert (dtrain.num_row(), dtrain.num_col()) == (nrow, ncol)
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watchlist = [(dtrain, 'train')]
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param = {'max_depth': 3, 'objective': 'binary:logistic', 'verbosity': 0}
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bst = xgb.train(param, dtrain, 5, watchlist)
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bst.predict(dtrain)
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i32 = csr_matrix((x.data.astype(np.int32), x.indices, x.indptr), shape=x.shape)
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f32 = csr_matrix(
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(i32.data.astype(np.float32), x.indices, x.indptr), shape=x.shape
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)
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di32 = xgb.DMatrix(i32)
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df32 = xgb.DMatrix(f32)
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dense = xgb.DMatrix(f32.toarray(), missing=0)
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with tempfile.TemporaryDirectory() as tmpdir:
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path = os.path.join(tmpdir, "f32.dmatrix")
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df32.save_binary(path)
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with open(path, "rb") as fd:
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df32_buffer = np.array(fd.read())
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path = os.path.join(tmpdir, "f32.dmatrix")
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di32.save_binary(path)
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with open(path, "rb") as fd:
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di32_buffer = np.array(fd.read())
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path = os.path.join(tmpdir, "dense.dmatrix")
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dense.save_binary(path)
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with open(path, "rb") as fd:
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dense_buffer = np.array(fd.read())
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np.testing.assert_equal(df32_buffer, di32_buffer)
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np.testing.assert_equal(df32_buffer, dense_buffer)
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def test_sparse_dmatrix_csc(self):
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nrow = 1000
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ncol = 100
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x = rand(nrow, ncol, density=0.0005, format='csc', random_state=rng)
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assert x.indices.max() < nrow - 1
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x.data[:] = 1
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dtrain = xgb.DMatrix(x, label=rng.binomial(1, 0.3, nrow))
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assert (dtrain.num_row(), dtrain.num_col()) == (nrow, ncol)
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watchlist = [(dtrain, 'train')]
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param = {'max_depth': 3, 'objective': 'binary:logistic', 'verbosity': 0}
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bst = xgb.train(param, dtrain, 5, watchlist)
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bst.predict(dtrain)
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def test_unknown_data(self):
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class Data:
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pass
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with pytest.raises(TypeError):
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with pytest.warns(UserWarning):
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d = Data()
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xgb.DMatrix(d)
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from scipy import sparse
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rng = np.random.RandomState(1994)
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X = rng.rand(10, 10)
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y = rng.rand(10)
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X = sparse.dok_matrix(X)
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Xy = xgb.DMatrix(X, y)
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assert Xy.num_row() == 10
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assert Xy.num_col() == 10
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