o €o™iâã@sLddlZddlmZddlZddlmZmZmZmZm Z Gdd„deƒZ dS)éN)ÚTuple)ÚModuleÚTensorÚcosÚsinÚzerosc sŒeZdZUdZeed<ddedeeefdedd f‡fd d „ Z deeefdefd d „Z deeefdd fdd„Z dedefdd„Z ‡Z S)ÚPositionEncodingSinezHA sinusoidal position encoding that generalized to 2-dimensional images.Úpe©ér TÚd_modelÚ max_shapeÚ temp_bug_fixÚreturnNcs4tƒ ¡||_||_| |¡}|jd|dddS)aYConstruct sinusoidal positional encoding. Args: d_model: Dimensions of model input. max_shape (tuple): for 1/8 featmap, the max length of 256 corresponds to 2048 pixels temp_bug_fix (bool): As noted in this [issue](https://github.com/zju3dv/LoFTR/issues/41), the original implementation of LoFTR includes a bug in the pos-enc impl, which has little impact on the final performance. For now, we keep both impls for backward compatibility. We will remove the buggy impl after re-training all variants of our released models. r F)Ú persistentN)ÚsuperÚ__init__r rÚ_create_position_encodingÚregister_buffer)Úselfr r rr ©Ú __class__©ú`/home/ubuntu/.local/lib/python3.10/site-packages/kornia/feature/loftr/utils/position_encoding.pyrs  zPositionEncodingSine.__init__cCsbt|jg|¢Rƒ}t |¡ d¡ ¡ d¡}t |¡ d¡ ¡ d¡}|jrAt t  d|jdd¡ ¡t   d¡ |jd¡}nt t  d|jdd¡ ¡t   d¡ |jd¡}|dd…ddf}t ||ƒ|ddd…dd…dd…f<t ||ƒ|ddd…dd…dd…f<t ||ƒ|ddd…dd…dd…f<t ||ƒ|ddd…dd…dd…f<| d¡S)zÈCreate a position encoding from scratch. For 1/8 feature map (which is standard): If the input image size is H, W (both divisible by 8), the max_shape should be (H//8, W//8). réégˆÃ@Néé)rr ÚtorchÚonesÚcumsumÚfloatÚ unsqueezerÚexpÚarangeÚmathÚlogrr)rr r Ú y_positionÚ x_positionÚdiv_termrrrr2s ,ÿ,ÿ$$$$ z.PositionEncodingSine._create_position_encodingcCs| |¡ |jj¡|_dS)zÊUpdate position encoding to new max_shape. For 1/8 feature map (which is standard): If the input image size is H, W (both divisible by 8), the max_shape should be (H//8, W//8). N)rÚtor Údevice)rr rrrÚupdate_position_encoding_sizeJsz2PositionEncodingSine.update_position_encoding_sizeÚxc Cs˜| d¡|j d¡ks| d¡|j d¡kr3t| d¡|j d¡ƒt| d¡|j d¡ƒf}| |¡||jdd…dd…d| d¡…d| d¡…fS)z=Run forward. Args: x: [N, C, H, W] rrN)Úsizer Úmaxr,)rr-r rrrÚforwardRs,0 2zPositionEncodingSine.forward)r T)Ú__name__Ú __module__Ú __qualname__Ú__doc__rÚ__annotations__ÚintrÚboolrrr,r0Ú __classcell__rrrrrs (r) r%ÚtypingrrÚ kornia.corerrrrrrrrrrÚs