[Paper] Is Figure 2 (left) correct?

[wangyan-hlab]

Hi, @alexfrom0815
Thank you for your excellent contribution to the online BPP research!

I met a problem when reading your paper.
As I can understand, you parameterize the bin as an LxW grid and calculate the height map accordingly.
Then you set the FLB point of an item as the reference to match the load point, and a feasible mask is calculated based on the constraints (1.enough space 2.stability).

However, when I try to reproduce the mask in Figure 2 with your code, the result was very different.

The points I'd like to verify:

1. Is the green item size 3 x 3 x3 in Figure 2?
   I couldn't find the exact item size in your paper, but I use 3 x 3 x 3 when reproducing the mask.

2. Are the L and W symbols on the grid wrong (should be W to X and L to Y)?
   In Figure 2, I think it shows X axis corresponds to L and Y axis to W, but I find in the code ./acktr/utils.py that x is to width and y to length.

3. Is the mask in Figure 2 correct?
   The mask is confusing because I still can't reproduce it after adjusting the item size and x,y order.

I would appreciate it if you could kindly answer my questions.