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Add error for overflowing nbits during PQ construction #3833

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Add error for overflowing nbits during PQ construction #3833

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1 change: 1 addition & 0 deletions faiss/impl/ProductQuantizer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -61,6 +61,7 @@ void ProductQuantizer::set_derived_values() {
"The dimension of the vector (d) should be a multiple of the number of subquantizers (M)");
dsub = d / M;
code_size = (nbits * M + 7) / 8;
FAISS_THROW_IF_MSG(nbits > 24, "nbits larger than 24 is not practical.");
ksub = 1 << nbits;
centroids.resize(d * ksub);
verbose = false;
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