o
    wZh	                     @   sb   d dl mZ d dlmZ d dlmZ d dlmZmZ dgZ	edZ
edG dd dee Zd	S )
    )Sized)TypeVar)functional_datapipe)	DataChunkMapDataPipeBatcherMapDataPipe_Tbatchc                       sz   e Zd ZU dZeed< eed< eed< defdee	 dedede
e ddf
 fd	d
ZdefddZdefddZ  ZS )r   a  
    Create mini-batches of data (functional name: ``batch``).

    An outer dimension will be added as ``batch_size`` if ``drop_last`` is set to ``True``,
    or ``length % batch_size`` for the last batch if ``drop_last`` is set to ``False``.

    Args:
        datapipe: Iterable DataPipe being batched
        batch_size: The size of each batch
        drop_last: Option to drop the last batch if it's not full

    Example:
        >>> # xdoctest: +SKIP
        >>> from torchdata.datapipes.map import SequenceWrapper
        >>> dp = SequenceWrapper(range(10))
        >>> batch_dp = dp.batch(batch_size=2)
        >>> list(batch_dp)
        [[0, 1], [2, 3], [4, 5], [6, 7], [8, 9]]
    datapipe
batch_size	drop_lastFwrapper_classreturnNc                    s6   |dksJ dt    || _|| _|| _|| _d S )Nr   z+Batch size is required to be larger than 0!)super__init__r
   r   r   r   )selfr
   r   r   r   	__class__ V/var/www/auris/lib/python3.10/site-packages/torch/utils/data/datapipes/map/grouping.pyr   )   s   

zBatcherMapDataPipe.__init__c              
      s   g }t | j |d  j }z| fdd|D   |W S  tyJ } z js=t|dkr= |W  Y d }~S td| d|d }~ww )N   c                 3   s    | ]} j | V  qd S )N)r
   ).0ir   r   r   	<genexpr>;   s    z1BatcherMapDataPipe.__getitem__.<locals>.<genexpr>r   zIndex z is out of bound.)ranger   extendr   
IndexErrorr   len)r   indexr	   indiceser   r   r   __getitem__7   s   zBatcherMapDataPipe.__getitem__c                 C   sP   t | jtr| jrt| j| j S t| j| j d | j S tt| j d)Nr   z# instance doesn't have valid length)	
isinstancer
   r   r   r   r   	TypeErrortype__name__r   r   r   r   __len__C   s
   zBatcherMapDataPipe.__len__)r&   
__module____qualname____doc__r   __annotations__intboolr   r   r%   r   r"   r'   __classcell__r   r   r   r   r      s(   
 N)collections.abcr   typingr   Z%torch.utils.data.datapipes._decoratorr   Z#torch.utils.data.datapipes.datapiper   r   __all__r   r   r   r   r   r   <module>   s   