A question regarding the variable ray_directions

[OshriHalimi]

Based on the documentation here:

nerf-pytorch/nerf/nerf_helpers.py

Line 85 in a14357d

direction of each ray (a unit vector). `ray_directions[i][j]` denotes the direction of the ray

I would expect ray_directions to contain unit vectors. However, numerically looking into the values, this is not the case - the values are close to 1 but have a large variation around the exact value (around 10%-20%).

Is this a bug?
If not, what is the meaning of the vector magnitude?

Thanks!

[airalcorn2]

ray_directions is eventually normalized in run_one_iter_of_nerf.