U
    ½mœdx  ã                   @   sÌ   d Z ddlZddlZddlZddlmZmZ ddlZ	ddl
mZmZ ddlmZ ddlmZ ddlmZ dd	dgd
d	d	gdd	dgdd	dggZdd	ddgZdd„ Zdd„ Zdd„ Zdd„ Zdd„ Zdd„ ZdS )zs
Tests for chi2, currently the only feature selection function designed
specifically to work with sparse matrices.
é    N)Ú
coo_matrixÚ
csr_matrix©ÚSelectKBestÚchi2)Ú
_chisquare)Úassert_array_almost_equal)Úassert_array_equalé   é   é	   é   c                 C   s   t t| d�S )zMake k-best chi2 selector©Úkr   r   © r   úb/home/sam/Atlas/atlas_env/lib/python3.8/site-packages/sklearn/feature_selection/tests/test_chi2.pyÚmkchi2   s    r   c                  C   s  t dd� tt¡} t dd� tt¡} t| jdd�dgƒ t|  t¡t t¡d d …dgf ƒ t dd� tt¡} tt	| jdd�ƒddgƒ t
ttjd�}t dd� |t¡} tt	| jdd�ƒddgƒ |  |¡}t|j|jd dgƒ | ¡ }t dd� |t¡ ¡ }t||ƒ d S )Nr   r   T)Úindicesr   r
   )Zdtype)r   ÚfitÚXÚyr	   Zget_supportZ	transformÚnpÚarrayÚsortedr   Zfloat64ÚshapeZtoarrayÚfit_transformr   )r   ZXspZXtransZXtrans2r   r   r   Ú	test_chi2   s    $
r   c                  C   s   t tƒ} tdd� | t¡ d S )Nr
   r   )r   r   r   r   r   )ZXcoor   r   r   Útest_chi2_coo5   s    r   c               
   C   sX   ddgddggddg } }| t  | ¡t| ƒfD ]$} t t¡� t| |ƒ W 5 Q R X q.d S )Nr   r   g#B’¡œÇ»)r   r   r   ÚpytestZraisesÚ
ValueErrorr   )r   r   r   r   r   Útest_chi2_negative=   s    r    c               	   C   s†   t jdd��P} t  d¡ tddgddggddgƒ\}}| D ]}dt|ƒkr:td| ƒ‚q:W 5 Q R X t|dtjgƒ t|d tjƒ d S )NT)ÚrecordÚalwaysr   r   zdivide by zerozFound unexpected warning %s)	ÚwarningsÚcatch_warningsÚsimplefilterr   ÚreprÚAssertionErrorr	   r   Únan)ZwarnedÚchiÚpÚwr   r   r   Útest_chi2_unused_featureE   s    
r,   c                  C   sd   t  ddgddgg¡} t  ddgddgg¡}tj | |¡\}}t| |ƒ\}}t||ƒ t||ƒ d S )Ng       @g      ð?g      ø?)r   r   ÚscipyÚstatsZ	chisquarer   r   )ZobsÚexpZchi_scpZp_scpZchi_ourZp_ourr   r   r   Útest_chisquareR   s    
r0   )Ú__doc__r#   Únumpyr   r   Zscipy.sparser   r   Zscipy.statsr-   Zsklearn.feature_selectionr   r   Z/sklearn.feature_selection._univariate_selectionr   Zsklearn.utils._testingr   r	   r   r   r   r   r   r    r,   r0   r   r   r   r   Ú<module>   s"   $