Estimated photo-z as determined by SPIDERz versus the actual redshift for the COSMOS data set discussed in Sect. 4. This determination was performed with ten-band photometry and a designated bin size of 0.01. The training and evaluation sets are comprised of 3000 and 11 365 randomly chosen galaxies, respectively. With this small bin size, a relatively large ratio of training set objects is needed in order to adequately bins with training objects. Outliers in a determination are defined by Eq. (1), shown as those outside of the two diagonal lines. The density of points within the lines is quite high – only 2.0% of points lie outside of the lines as outliers. This determination features a reduced RMS error of 0.022.