Dear lammps users,

I am trying to implement my neural network potential and read previous posts that are relevant to me. I set the following lines in my init_style() function.

```
int irequest = neighbor->request(this,instance_me);
```

```
neighbor->requests[irequest]->compute = 1;
```

```
neighbor->requests[irequest]->half = 0;
```

```
neighbor->requests[irequest]->full = 1;
```

```
neighbor->requests[irequest]->ghost = 1;
```

I used a simulation block of 8 bases and printed out number of neighbors of neighbors for first atom (i=0). The ‘j’ atoms are the neighbors of ‘i’. The neighbors of ‘i’ suppose to have at least 38 or 40 neighbors but they have less neighbors than the neighbors of ‘i’. The neighbors colored in red are other bases. The following is the output.

number of neighbors of i=0 is 38

number of neighbors of j=253 is 29

number of neighbors of j=237 is 32

number of neighbors of j=240 is 29

number of neighbors of j=241 is 36

number of neighbors of j=199 is 32

number of neighbors of j=204 is 29

number of neighbors of j=205 is 36

number of neighbors of j=182 is 25

number of neighbors of j=183 is 35

number of neighbors of j=186 is 37

number of neighbors of j=187 is 37

number of neighbors of j=188 is 32

number of neighbors of j=189 is 39

number of neighbors of j=71 is 32

number of neighbors of j=72 is 29

number of neighbors of j=73 is 36

number of neighbors of j=54 is 25

number of neighbors of j=55 is 35

number of neighbors of j=56 is 37

number of neighbors of j=57 is 37

number of neighbors of j=58 is 32

number of neighbors of j=59 is 39

number of neighbors of j=16 is 25

number of neighbors of j=17 is 35

number of neighbors of j=18 is 32

number of neighbors of j=19 is 39

number of neighbors of j=22 is 37

number of neighbors of j=23 is 37

number of neighbors of j=1 is 38

number of neighbors of j=2 is 40

number of neighbors of j=3 is 40

number of neighbors of j=4 is 40

number of neighbors of j=5 is 40

number of neighbors of j=6 is 40

number of neighbors of j=7 is 40

number of neighbors of j=8 is 38

number of neighbors of j=27 is 38

number of neighbors of j=91 is 38

I am not sure if I have done something wrong or I do not understand how neighbors of neighbors are created. My cutoff distance is 6.0 A and used "neighbor 0.5 bin”.

I appreciate for any inputs.

Ganga P Purja Pun