DEV: modified weights initialization
DEV: modified weights initialization

Former-commit-id: 3d7d48894e7e8e0b40290bfa2644e88a976a2540
Former-commit-id: e66d7f0a43b7b18f97349a28595ecb0608ff03af
3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox,3324fr/spinalcordtoolbox