It seems that the current version of SPTAG only supports np.float32.

[puluwen]

When i use the np.float64, I turned the SPTAG.Annindex() datatype parameter from 'Float' (used in the test demo) to 'Double', 'Float64','float64', 'double'， but all failed.

[MaggieQi]

We currently only support Int8, Int16 and Float (float32). Float64 is not supported. We will add support for more data types soon : )

[puluwen]

I suggest writing this information into readme.

[puluwen]

I also found another problem that sptag could not accept data that occupied more than 4 GB of memory.