"""Natural tensors of unit vector. This is a faster implementation compared to unit_vector_1.py. Here, N^l = H \cdot a^l, where H can be precomputed, and this can avoid loop. and the rest are batch ...
"""Natural tensors of unit vector. and the rest are batch dimensions. L: Maximum rank of the natural tensors to create. normalize: Normalization type. See `get_nt ...