Duplicate point in noise & cluster

[rugleb]

Is it correct to add the point to the noise at this step?

		if len(neighborPts) < minPoints {
			noise = append(noise, i)
		}

As far as I understand, there may be a situation where a point from the noise will be added to the cluster later. Thus, the total number of points in clusters + noise will be greater than the total number of points.

[rugleb]

I think correct way like this:

	if len(neighborPts) < minPoints {
			continue
	}

   	// expand cluster
        //...

Then after main cycle:

        for for i := 0; i < len(points); i++ {
            // build clusters
        }

	for i, member := range members {
		if !member {
			noise = append(noise, i)
		}
	}

[smira]

The algorithm is described in the comments above, if you feel the implementation is wrong, or the algorithm is wrong, please feel free to open a PR with some tests showing corrected behavior.