Algorithm 2: Convert 2D to 3D coordinates

Input: 2D bone point coordinates Output: $Z_{\mathit{i}}$ 1: Enter the linear layer and increase its dimension by 1024; 2: Standardize for batch processing and discard; 3: Enter ReLUs for activation processing; 4: Select the Z value with the minor error from it; 5: Entering the linear layer once more, generating an output of size 3 n; 6: Combine with input and output the result.