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.. _sphx_glr_auto_examples_release_highlights_plot_release_highlights_1_0_0.py:
=======================================
Release Highlights for scikit-learn 1.0
=======================================
.. currentmodule:: sklearn
We are very pleased to announce the release of scikit-learn 1.0! The library
has been stable for quite some time, releasing version 1.0 is recognizing that
and signalling it to our users. This release does not include any breaking
changes apart from the usual two-release deprecation cycle. For the future, we
do our best to keep this pattern.
This release includes some new key features as well as many improvements and
bug fixes. We detail below a few of the major features of this release. **For
an exhaustive list of all the changes**, please refer to the :ref:`release
notes `.
To install the latest version (with pip)::
pip install --upgrade scikit-learn
or with conda::
conda install -c conda-forge scikit-learn
.. GENERATED FROM PYTHON SOURCE LINES 31-74
Keyword and positional arguments
---------------------------------------------------------
The scikit-learn API exposes many functions and methods which have many input
parameters. For example, before this release, one could instantiate a
:class:`~ensemble.HistGradientBoostingRegressor` as::
HistGradientBoostingRegressor("squared_error", 0.1, 100, 31, None,
20, 0.0, 255, None, None, False, "auto", "loss", 0.1, 10, 1e-7,
0, None)
Understanding the above code requires the reader to go to the API
documentation and to check each and every parameter for its position and
its meaning. To improve the readability of code written based on scikit-learn,
now users have to provide most parameters with their names, as keyword
arguments, instead of positional arguments. For example, the above code would
be::
HistGradientBoostingRegressor(
loss="squared_error",
learning_rate=0.1,
max_iter=100,
max_leaf_nodes=31,
max_depth=None,
min_samples_leaf=20,
l2_regularization=0.0,
max_bins=255,
categorical_features=None,
monotonic_cst=None,
warm_start=False,
early_stopping="auto",
scoring="loss",
validation_fraction=0.1,
n_iter_no_change=10,
tol=1e-7,
verbose=0,
random_state=None,
)
which is much more readable. Positional arguments have been deprecated since
version 0.23 and will now raise a ``TypeError``. A limited number of
positional arguments are still allowed in some cases, for example in
:class:`~decomposition.PCA`, where ``PCA(10)`` is still allowed, but ``PCA(10,
False)`` is not allowed.
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Spline Transformers
---------------------------------------------------------
One way to add nonlinear terms to a dataset's feature set is to generate
spline basis functions for continuous/numerical features with the new
:class:`~preprocessing.SplineTransformer`. Splines are piecewise polynomials,
parametrized by their polynomial degree and the positions of the knots. The
:class:`~preprocessing.SplineTransformer` implements a B-spline basis.
.. figure:: ../linear_model/images/sphx_glr_plot_polynomial_interpolation_001.png
:target: ../linear_model/plot_polynomial_interpolation.html
:align: center
The following code shows splines in action, for more information, please
refer to the :ref:`User Guide `.
.. GENERATED FROM PYTHON SOURCE LINES 90-99
.. code-block:: default
import numpy as np
from sklearn.preprocessing import SplineTransformer
X = np.arange(5).reshape(5, 1)
spline = SplineTransformer(degree=2, n_knots=3)
spline.fit_transform(X)
.. rst-class:: sphx-glr-script-out
Out:
.. code-block:: none
array([[0.5 , 0.5 , 0. , 0. ],
[0.125, 0.75 , 0.125, 0. ],
[0. , 0.5 , 0.5 , 0. ],
[0. , 0.125, 0.75 , 0.125],
[0. , 0. , 0.5 , 0.5 ]])
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Quantile Regressor
--------------------------------------------------------------------------
Quantile regression estimates the median or other quantiles of :math:`y`
conditional on :math:`X`, while ordinary least squares (OLS) estimates the
conditional mean.
As a linear model, the new :class:`~linear_model.QuantileRegressor` gives
linear predictions :math:`\hat{y}(w, X) = Xw` for the :math:`q`-th quantile,
:math:`q \in (0, 1)`. The weights or coefficients :math:`w` are then found by
the following minimization problem:
.. math::
\min_{w} {\frac{1}{n_{\text{samples}}}
\sum_i PB_q(y_i - X_i w) + \alpha ||w||_1}.
This consists of the pinball loss (also known as linear loss),
see also :class:`~sklearn.metrics.mean_pinball_loss`,
.. math::
PB_q(t) = q \max(t, 0) + (1 - q) \max(-t, 0) =
\begin{cases}
q t, & t > 0, \\
0, & t = 0, \\
(1-q) t, & t < 0
\end{cases}
and the L1 penalty controlled by parameter ``alpha``, similar to
:class:`linear_model.Lasso`.
Please check the following example to see how it works, and the :ref:`User
Guide ` for more details.
.. figure:: ../linear_model/images/sphx_glr_plot_quantile_regression_002.png
:target: ../linear_model/plot_quantile_regression.html
:align: center
:scale: 50%
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Feature Names Support
--------------------------------------------------------------------------
When an estimator is passed a `pandas' dataframe
`_ during
:term:`fit`, the estimator will set a `feature_names_in_` attribute
containing the feature names. Note that feature names support is only enabled
when the column names in the dataframe are all strings. `feature_names_in_`
is used to check that the column names of the dataframe passed in
non-:term:`fit`, such as :term:`predict`, are consistent with features in
:term:`fit`:
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.. code-block:: default
from sklearn.preprocessing import StandardScaler
import pandas as pd
X = pd.DataFrame([[1, 2, 3], [4, 5, 6]], columns=["a", "b", "c"])
scalar = StandardScaler().fit(X)
scalar.feature_names_in_
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Out:
.. code-block:: none
array(['a', 'b', 'c'], dtype=object)
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The support of :term:`get_feature_names_out` is available for transformers
that already had :term:`get_feature_names` and transformers with a one-to-one
correspondence between input and output such as
:class:`~preprocessing.StandardScaler`. :term:`get_feature_names_out` support
will be added to all other transformers in future releases. Additionally,
:meth:`compose.ColumnTransformer.get_feature_names_out` is available to
combine feature names of its transformers:
.. GENERATED FROM PYTHON SOURCE LINES 163-178
.. code-block:: default
from sklearn.compose import ColumnTransformer
from sklearn.preprocessing import OneHotEncoder
import pandas as pd
X = pd.DataFrame({"pet": ["dog", "cat", "fish"], "age": [3, 7, 1]})
preprocessor = ColumnTransformer(
[
("numerical", StandardScaler(), ["age"]),
("categorical", OneHotEncoder(), ["pet"]),
],
verbose_feature_names_out=False,
).fit(X)
preprocessor.get_feature_names_out()
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Out:
.. code-block:: none
array(['age', 'pet_cat', 'pet_dog', 'pet_fish'], dtype=object)
.. GENERATED FROM PYTHON SOURCE LINES 179-182
When this ``preprocessor`` is used with a pipeline, the feature names used
by the classifier are obtained by slicing and calling
:term:`get_feature_names_out`:
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.. code-block:: default
from sklearn.linear_model import LogisticRegression
from sklearn.pipeline import make_pipeline
y = [1, 0, 1]
pipe = make_pipeline(preprocessor, LogisticRegression())
pipe.fit(X, y)
pipe[:-1].get_feature_names_out()
.. rst-class:: sphx-glr-script-out
Out:
.. code-block:: none
array(['age', 'pet_cat', 'pet_dog', 'pet_fish'], dtype=object)
.. GENERATED FROM PYTHON SOURCE LINES 192-204
A more flexible plotting API
--------------------------------------------------------------------------
:class:`metrics.ConfusionMatrixDisplay`,
:class:`metrics.PrecisionRecallDisplay`, :class:`metrics.DetCurveDisplay`,
and :class:`inspection.PartialDependenceDisplay` now expose two class
methods: `from_estimator` and `from_predictions` which allow users to create
a plot given the predictions or an estimator. This means the corresponding
`plot_*` functions are deprecated. Please check :ref:`example one
` and
:ref:`example two
` for
how to use the new plotting functionalities.
.. GENERATED FROM PYTHON SOURCE LINES 206-226
Online One-Class SVM
--------------------------------------------------------------------------
The new class :class:`~linear_model.SGDOneClassSVM` implements an online
linear version of the One-Class SVM using a stochastic gradient descent.
Combined with kernel approximation techniques,
:class:`~linear_model.SGDOneClassSVM` can be used to approximate the solution
of a kernelized One-Class SVM, implemented in :class:`~svm.OneClassSVM`, with
a fit time complexity linear in the number of samples. Note that the
complexity of a kernelized One-Class SVM is at best quadratic in the number
of samples. :class:`~linear_model.SGDOneClassSVM` is thus well suited for
datasets with a large number of training samples (> 10,000) for which the SGD
variant can be several orders of magnitude faster. Please check this
:ref:`example
` to see how
it's used, and the :ref:`User Guide ` for more
details.
.. figure:: ../miscellaneous/images/sphx_glr_plot_anomaly_comparison_001.png
:target: ../miscellaneous/plot_anomaly_comparison.html
:align: center
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Histogram-based Gradient Boosting Models are now stable
--------------------------------------------------------------------------
:class:`~sklearn.ensemble.HistGradientBoostingRegressor` and
:class:`~ensemble.HistGradientBoostingClassifier` are no longer experimental
and can simply be imported and used as::
from sklearn.ensemble import HistGradientBoostingClassifier
.. GENERATED FROM PYTHON SOURCE LINES 237-242
New documentation improvements
------------------------------
This release includes many documentation improvements. Out of over 2100
merged pull requests, about 800 of them are improvements to our
documentation.
.. rst-class:: sphx-glr-timing
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