Pipeline should implement __len__ #13418
Description
Description
With the new indexing support pipe[:len(pipe)] raises an error.
Steps/Code to Reproduce
from sklearn import svm
from sklearn.datasets import samples_generator
from sklearn.feature_selection import SelectKBest
from sklearn.feature_selection import f_regression
from sklearn.pipeline import Pipeline
# generate some data to play with
X, y = samples_generator.make_classification(
n_informative=5, n_redundant=0, random_state=42)
anova_filter = SelectKBest(f_regression, k=5)
clf = svm.SVC(kernel='linear')
pipe = Pipeline([('anova', anova_filter), ('svc', clf)])
len(pipe)Versions
System:
python: 3.6.7 | packaged by conda-forge | (default, Feb 19 2019, 18:37:23) [GCC 4.2.1 Compatible Clang 4.0.1 (tags/RELEASE_401/final)]
executable: /Users/krisz/.conda/envs/arrow36/bin/python
machine: Darwin-18.2.0-x86_64-i386-64bit
BLAS:
macros: HAVE_CBLAS=None
lib_dirs: /Users/krisz/.conda/envs/arrow36/lib
cblas_libs: openblas, openblas
Python deps:
pip: 19.0.3
setuptools: 40.8.0
sklearn: 0.21.dev0
numpy: 1.16.2
scipy: 1.2.1
Cython: 0.29.6
pandas: 0.24.1