U
    (dp                     @   s`   d dl 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)AnyCallableOptionalTuple)Image   )download_url)VisionDatasetc                       sv   e Zd ZdZdddgdddgdZde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 (string): 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 an 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 ec16c51db3855ca6c91edd34d0e9b197zMhttps://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	}|
|
d}dd | D }dd |D }tj|tjd	d
}|d d d jtjd	}dd |D }W 5 Q R X || _|| _d S )N)r   r   r   r   )md5r   c                 S   s   g | ]}|   qS  )decodesplit).0liner   r   =/tmp/pip-unpacked-wheel-vx7f76es/torchvision/datasets/usps.py
<listcomp>?   s     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   @   s     z,USPS.__init__.<locals>.<listcomp>.<listcomp>r   Nr   )r   datar   r   r   r   @   s     )Zdtype)r      r   r         c                 S   s   g | ]}t |d  d qS )r   r   )int)r   dr   r   r   r   C   s     )super__init__
split_listospathjoinr   existsr   bz2open	readlinesnpZasarrayZfloat32ZreshapeZastypeZuint8r   targets)selfr   r   r   r   r   r   urlfilenameZchecksum	full_pathr*   fpraw_dataZtmp_listZimgsr.   	__class__r   r   r$   ,   s    zUSPS.__init__)indexr   c                 C   sX   | j | t| j|  }}tj|dd}| jdk	r<| |}| jdk	rP| |}||fS )z
        Args:
            index (int): Index

        Returns:
            tuple: (image, target) where target is index of the target class.
        L)modeN)r   r!   r.   r   Z	fromarrayr   r   )r/   r7   imgtargetr   r   r   __getitem__H   s    



zUSPS.__getitem__)r   c                 C   s
   t | jS )N)lenr   )r/   r   r   r   __len__^   s    zUSPS.__len__)TNNF)__name__
__module____qualname____doc__r%   strboolr   r   r$   r!   r   r   r<   r>   __classcell__r   r   r5   r   r
      s0       r
   )r&   typingr   r   r   r   Znumpyr-   ZPILr   utilsr   Zvisionr	   r
   r   r   r   r   <module>   s   