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Allow k and M suffixes in IVF indexes
Summary:
Allows factory strings like IVF3k,Flat as a shorthand for 3072 centroids.
The main question is whether k or M should be metric (k=1000) or power of 2 (k=1024):
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pro-metric: standard,
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pro-power of 2: in practice we use powers of 2 most often
The suffixes ki and Mi should be used for powers of 2 but this makes the notation more heavy (which is what we wanted to avoid in the first place).
So I picked power of 2.
Differential Revision: D62019941
This pull request has been merged in facebookresearch/faiss@d85fda7fca18128cb8cca47205663a47a7e4649e.