Algorithm 1: Correction of Skeleton Key Point Coordinates

Input: Bone point coordinate matrix’F’, size’$T\times N_t\times 2\mathrm{’}$ Output: $\mathrm{Missing} \mathrm{point} N_t\times 2$ Procedure: 1: Input: Enter key point data’F’; 2: Forget gate: $F_t$ is 0 or 1 If $C_{t-1}\times F_t$ = 0, The input value is reserved Else: The input value is forgotten; 3: Input gate: By the sigmoid and tanh functions, determines the value affecting $C_t$; 4: Output gate: By the sigmoid function, output $C_t^{\prime }$, then $C_t^{\prime }\times O_t$; 5: Combine T results for linear regression and out the missing point’s coordinates.