memory allocation to avoid mem leaks * added an IndexIVFScalarQuantizer type that offers an intermediate compression between IVFFlat and IVFPQ * support removal of indices in IndexIDMap / IndexFlat combination * various fixes in GPU code
avoid reading beyond the end of an array in fvec_L2sqr and related functions
- better selection of training sets for PQ and preprocessing - GPU parameter object - IndexIDMap fixed - fixed redo bug in clustering