change metric in create_split

[goodloop]

correct me if I'm wrong.

I think the create_split() method is used to find two mean points p,q. and we will split the nodes later with method to compare the distance difference between p,node[i] and q,node[i] for each node in current hyperplane.

and we will use dot(n, node[i]) for quick calculation. because n=p-q, so dot(n, node[i]) = dot(p, node[i]) - dot(q, node[i])

if we can keep p and q are normalized. dot(n, node[i]) may be better for representing the node i is near p or q in Angular metric.

[erikbern]

interesting – let me take a look later this week

[goodloop]

@erikbern any thoughts about this?

[erikbern]

Hey I completely forgot about this one. Just rebased it. Let me see if it works and if it impacts performance.

[goodloop]

sounds great! Pls remind me if any result you get.

[goodloop]

@erikbern any problem about this pr?

[erikbern]

sorry forgot about this one, will take a look