o Ni @sdZddlmZddlmZddlmZddlZddlmmZ ddZ dd Z d d Z d e j fd dZedgdZ  dddZdS)z$Provides `image_as_moving_sequence`.)absolute_import)division)print_functionNcsVtdfdd}tj||gtjddd}Wd|S1s$wY|S)aCreate a moving image sequence from the given image a left padding values. Args: image: [in_h, in_w, n_channels] uint8 array pad_lefts: [sequence_length, 2] int32 array of left padding values total_padding: tensor of padding values, (pad_h, pad_w) Returns: [sequence_length, out_h, out_w, n_channels] uint8 image sequence, where out_h = in_h + pad_h, out_w = in_w + out_w moving_sequencecsN|\}|}tj||gdd}tjd|jd}tj||gdd}t|S)Naxis)dtyper)tfstackzerosr concatpad)argspad_left pad_rightpaddingzimage total_padding]/home/ubuntu/.local/lib/python3.10/site-packages/tensorflow_datasets/video/moving_sequence.pyget_padded_image*s  z1_create_moving_sequence..get_padded_imageF)r infer_shape back_propN)r name_scopemap_fnuint8)r pad_leftsrr padded_imagesrrr_create_moving_sequences     r$cCst|}t|}t|}|jjdkrtd|jjdkr#td|jjdkr-tdtj|dd}tj|dd}|tj|dd}||}|jjdksRJd |S) zConstruct a linear trajectory from x0. Args: x0: N-D float tensor. velocity: N-D float tensor t: [sequence_length]-length float tensor Returns: x: [sequence_length, ndims] float tensor. r zx0 must be a rank 1 tensorz velocity must be a rank 1 tensorzt must be a rank 1 tensorrrrr z-linear_trajectories should be a rank 2 tensor)r convert_to_tensorshapendims ValueError expand_dims)x0velocitytdxlinear_trajectoriesrrr_get_linear_trajectory9s"     r/cCs|d}tjd||S)aBounce potentially unbounded points to [0, 1]. Bouncing occurs by exact reflection, i.e. a pre-bound point at 1.1 is moved to 0.9, -0.2 -> 0.2. This theoretically can occur multiple times, e.g. 2.3 -> -0.7 -> 0.3 Implementation points <- points % 2 return min(2 - points, points) Args: points: float array Returns: tensor with same shape/dtype but values in [0, 1]. r )r mathminimum)pointsrrr_bounce_to_bboxVsr3r cCs(tjj|f|d}|tjj|dddS)Nr rT)rkeepdims)r randomnormallinalgnorm)r'r xrrr_get_random_unit_vectorksr:_MovingSequenceimage_sequence trajectorystart_positionr+@rB皙?c Csd}t|}|jjdkrtdt|t|}t||kr(td||ft|}|durrcondsequence_pad_leftssequencerrrimage_as_moving_sequencetsRQ             r])r@rArCN)__doc__ __future__rrr collectionstensorflow.compat.v2rLv2r r$r/r3rIr: namedtuplerVr]rrrrs"