def __init__(self,
transformers=None,
remainder='drop',
sparse_threshold=0.3,
n_jobs=None,
transformer_weights=None,
verbose=False):
if not has_sklearn():
raise ImportError("Scikit-learn is needed to use the "
"Column Transformer")
if not transformers:
warnings.warn('Transformers are required')
self.transformers = transformers
self.remainder = remainder
self.sparse_threshold = sparse_threshold
self.n_jobs = n_jobs
self.transformer_weights = transformer_weights
self.verbose = verbose
def _generate_hypercube(samples, dimensions, rng):
"""Returns distinct binary samples of length dimensions
"""
if not has_sklearn():
raise RuntimeError("Scikit-learn is needed to run \
make_classification.")
from sklearn.utils.random import sample_without_replacement
if dimensions > 30:
return np.hstack([np.random.randint(2, size=(samples,
dimensions - 30)),
_generate_hypercube(samples, 30, rng)])
random_state = int(rng.randint(dimensions))
out = sample_without_replacement(2 ** dimensions, samples,
random_state=random_state).astype(
dtype='>u4', copy=False)
out = np.unpackbits(out.view('>u1')).reshape((-1, 32))[:, -dimensions:]
return out
def fit(self, X, y) -> 'MulticlassClassifier':
"""
Fit a multiclass classifier.
"""
if not has_sklearn():
raise ImportError("Scikit-learn is needed to use "
"MulticlassClassifier derived classes.")
import sklearn.multiclass
if self.strategy == 'ovr':
self.multiclass_estimator = sklearn.multiclass.\
OneVsRestClassifier(self.estimator, n_jobs=None)
elif self.strategy == 'ovo':
self.multiclass_estimator = \
sklearn.multiclass.OneVsOneClassifier(
self.estimator, n_jobs=None)
else:
raise ValueError('Invalid multiclass strategy ' +
str(self.strategy) + ', must be one of '
'{"ovr", "ovo"}')
X, _, _, _, _ = input_to_host_array(X)
y, _, _, _, _ = input_to_host_array(y)
with cuml.internals.exit_internal_api():
self.multiclass_estimator.fit(X, y)
return self
# License: BSD
# This code originates from the Scikit-Learn library,
# it was since modified to allow GPU acceleration.
# This code is under BSD 3 clause license.
# Authors mentioned above do not endorse or promote this production.
from itertools import chain
from itertools import compress
from joblib import Parallel
import functools
import timeit
import numbers
from cuml.common.import_utils import has_sklearn
if has_sklearn():
from sklearn.base import clone
from sklearn.utils import Bunch
from contextlib import contextmanager
from collections import defaultdict
import warnings
from scipy import sparse as sp_sparse
from cupyx.scipy import sparse as cu_sparse
import numpy as cpu_np
import cupy as np
import numba
import pandas as pd
import cudf
def learn_model(draw, X, y, task, learner, n_estimators, n_targets):
# for lgbm or xgb return the booster or sklearn object?
use_sklearn_estimator = draw(st.booleans())
if learner == 'xgb':
assume(has_xgboost())
if task == 'regression':
objective = draw(
st.sampled_from(['reg:squarederror', 'reg:pseudohubererror']))
model = xgb.XGBRegressor(n_estimators=n_estimators,
tree_method='gpu_hist',
objective=objective,
enable_categorical=True,
verbosity=0).fit(X, y)
elif task == 'classification':
valid_objectives = [
'binary:logistic',
'binary:hinge',
'binary:logitraw',
'count:poisson',
]
if n_targets > 2:
valid_objectives += [
'rank:pairwise', 'rank:ndcg', 'rank:map', 'multi:softmax',
'multi:softprob'
]
objective = draw(st.sampled_from(valid_objectives))
model = xgb.XGBClassifier(n_estimators=n_estimators,
tree_method='gpu_hist',
objective=objective,
enable_categorical=True,
verbosity=0).fit(X, y)
pred = model.predict(X, output_margin=True)
if not use_sklearn_estimator:
model = model.get_booster()
return model, pred
elif learner == 'rf':
predict_model = 'GPU ' if y.dtype == np.float32 else 'CPU'
if task == 'regression':
model = cuml.ensemble.RandomForestRegressor(
n_estimators=n_estimators)
model.fit(X, y)
pred = model.predict(X, predict_model=predict_model)
elif task == 'classification':
model = cuml.ensemble.RandomForestClassifier(
n_estimators=n_estimators)
model.fit(X, y)
pred = model.predict_proba(X)
return model, pred
elif learner == 'skl_rf':
assume(has_sklearn())
if task == 'regression':
model = sklrfr(n_estimators=n_estimators)
model.fit(X, y)
pred = model.predict(X)
elif task == 'classification':
model = sklrfc(n_estimators=n_estimators)
model.fit(X, y)
pred = model.predict_proba(X)
return model, pred
elif learner == 'lgbm':
assume(has_lightgbm())
if task == 'regression':
model = lgb.LGBMRegressor(n_estimators=n_estimators).fit(X, y)
elif task == 'classification':
model = lgb.LGBMClassifier(n_estimators=n_estimators).fit(X, y)
pred = model.predict(X, raw_score=True)
if not use_sklearn_estimator:
model = model.booster_
return model, pred
from cuml.testing.utils import as_type
# See issue #4729
# Xgboost disabled due to CI failures
xgb = None
def has_xgboost():
return False
if has_lightgbm():
import lightgbm as lgb
if has_shap():
import shap
if has_sklearn():
from sklearn.datasets import make_regression, make_classification
from sklearn.ensemble import RandomForestRegressor as sklrfr
from sklearn.ensemble import RandomForestClassifier as sklrfc
def make_classification_with_categorical(*,
n_samples,
n_features,
n_categorical,
n_informative,
n_redundant,
n_repeated,
n_classes,
random_state,
numeric_dtype=np.float32):
