o oi@s4ddlZddlZddlmZmZGdddeZdS)N)ModuleTensorc s|eZdZdZdeddffdd Zdedefdd Z dd ed ededefddZ e  dde dede fddZ ZS)DiscreteSteereraModule for discrete rotation steerers. A steerer rotates keypoint descriptions in latent space as if they were obtained from rotated images. Args: generator: [N, N] tensor where N is the descriptor dimension. Example: >>> desc = torch.randn(512, 128) >>> generator = torch.randn(128, 128) >>> steerer = DiscreteSteerer(generator) >>> # steer 3 times: >>> steered_desc = steerer.steer_descriptions(desc, steerer_power=3, normalize=True) generatorreturnNcsttj||_dSN)super__init__torchnn Parameterr)selfr __class__K/home/ubuntu/.local/lib/python3.10/site-packages/kornia/feature/steerers.pyr *s zDiscreteSteerer.__init__xcCstjj||jSr)r r functionallinearr)r rrrrforward.szDiscreteSteerer.forwardF descriptions steerer_power normalizecCs2t|D]}||}q|rtjjj|dd}|S)N)dim)rangerr r rr)r rrr_rrrsteer_descriptions1s  z"DiscreteSteerer.steer_descriptionsC4generator_type steerer_ordercCsd}|dkr'tgdgdgdgdg}tj|g|d}||S|dkr|d }d |}||}g} |d krE| t|d tj|} td dD]'} | | } t | } t | }tj| |g| | ggtj d}| |g|qQtj| }||St d|)aCreate a steerer for pretrained DeDoDe descriptors int the "C-setting" from the paper https://arxiv.org/abs/2312.02152, where descriptors were trained for fixed steerers. Args: generator_type: The type of steerer generator. One of 'C4', 'SO2', default is 'C4'. These can be used with the DeDoDe descriptors in Kornia with C4 or SO2 in the name respectively (so called C-setting steerers). steerer_order: The discretisation order for SO2-steerers (NOT used for C4-steerers). Returns: The pretrained model. r)grrr)rrrr)rrrr)rrrrSO2 rr)dtypezUnknown generator_type: )r tensor block_diagevalappendeyemathpircossinfloat32extend ValueError)clsr!r"descriptor_dimc4_blockrnum_rot_blocks_per_freqdim_rot dim_trivialblocks angle_stepjtheta cos_theta sin_theta rot_matrixrrrcreate_dedode_default=s2"     z%DiscreteSteerer.create_dedode_default)rF)rr )__name__ __module__ __qualname____doc__rr rintboolr classmethodstrrrD __classcell__rrrrrs2  r)r0r kornia.corerrrrrrrs