a
    h                     @   sl   d dl Z d dlmZ d dlmZmZmZmZ d dlZ	ddl
mZ ddl
mZ ddlmZ G d	d
 d
eZdS )    N)Path)AnyCallableOptionalUnion   )_Image_fromarray   )download_url)VisionDatasetc                       sz   e Zd ZdZg dg ddZdeeef ee	e
 e	e
 edd fd	d
Zeeeef dddZedddZ  ZS )USPSa&  `USPS <https://www.csie.ntu.edu.tw/~cjlin/libsvmtools/datasets/multiclass.html#usps>`_ Dataset.
    The data-format is : [label [index:value ]*256 \n] * num_lines, where ``label`` lies in ``[1, 10]``.
    The value for each pixel lies in ``[-1, 1]``. Here we transform the ``label`` into ``[0, 9]``
    and make pixel values in ``[0, 255]``.

    Args:
        root (str or ``pathlib.Path``): Root directory of dataset to store``USPS`` data files.
        train (bool, optional): If True, creates dataset from ``usps.bz2``,
            otherwise from ``usps.t.bz2``.
        transform (callable, optional): A function/transform that takes in a PIL image
            and returns a transformed version. E.g, ``transforms.RandomCrop``
        target_transform (callable, optional): A function/transform that takes in the
            target and transforms it.
        download (bool, optional): If true, downloads the dataset from the internet and
            puts it in root directory. If dataset is already downloaded, it is not
            downloaded again.

    )zKhttps://www.csie.ntu.edu.tw/~cjlin/libsvmtools/datasets/multiclass/usps.bz2zusps.bz2Z ec16c51db3855ca6c91edd34d0e9b197)zMhttps://www.csie.ntu.edu.tw/~cjlin/libsvmtools/datasets/multiclass/usps.t.bz2z
usps.t.bz2Z 8ea070ee2aca1ac39742fdd1ef5ed118)traintestTNF)rootr   	transformtarget_transformdownloadreturnc                    s   t  j|||d |rdnd}| j| \}}}	tj| j|}
|r`tj|
s`t|| j||	d dd l	}|
|
n}dd | D }dd |D }tj|tjd	d
}|d d d jtjd	}dd |D }W d    n1 s0    Y  || _|| _d S )N)r   r   r   r   )md5r   c                 S   s   g | ]}|   qS  )decodesplit).0liner   r   G/var/www/auris/lib/python3.9/site-packages/torchvision/datasets/usps.py
<listcomp>@       z!USPS.__init__.<locals>.<listcomp>c                 S   s"   g | ]}d d |dd D qS )c                 S   s   g | ]}| d d qS ):)r   )r   xr   r   r   r   A   r   z,USPS.__init__.<locals>.<listcomp>.<listcomp>r	   Nr   )r   datar   r   r   r   A   r   )Zdtype)r      r!   r	   r      c                 S   s   g | ]}t |d  d qS )r   r	   )int)r   dr   r   r   r   D   r   )super__init__
split_listospathjoinr   existsr
   bz2open	readlinesnpZasarrayfloat32ZreshapeZastypeZuint8r    targets)selfr   r   r   r   r   r   urlfilenameZchecksum	full_pathr,   fpraw_dataZtmp_listZimgsr1   	__class__r   r   r&   -   s    ,zUSPS.__init__)indexr   c                 C   sV   | j | t| j|  }}t|dd}| jdur:| |}| jdurN| |}||fS )z
        Args:
            index (int): Index

        Returns:
            tuple: (image, target) where target is index of the target class.
        L)modeN)r    r#   r1   r   r   r   )r2   r:   imgtargetr   r   r   __getitem__I   s    



zUSPS.__getitem__)r   c                 C   s
   t | jS )N)lenr    )r2   r   r   r   __len___   s    zUSPS.__len__)TNNF)__name__
__module____qualname____doc__r'   r   strr   boolr   r   r&   r#   tupler   r?   rA   __classcell__r   r   r8   r   r      s$       
r   )r(   pathlibr   typingr   r   r   r   numpyr/   utilsr   r
   Zvisionr   r   r   r   r   r   <module>   s   