>Out of interest is nearest neighbour even remotely effective with 300 dimensions? They are/can be anyway. I had data with 50,000 dimensions, which after apply

>Out of interest is nearest neighbour even remotely effective with 300 dimensions? They are/can be anyway. I had data with 50,000 dimensions, which after applying dimensionality reduction techniques got it "down to" around 300! ANN worked very well on those vectors. This was prior to the glut of vector dbs we have available now, so it was all in-memory and used direct library calls to find neighbors.