Flag to avoid NaN check in clustering

[moshaad7]

https://github.com/facebookresearch/faiss/blob/e99ad124cbc40c03f72a37032ec25fcabf1479cf/faiss/Clustering.cpp#L283C1-L292C6

if (!codec) {
        // Check for NaNs in input data. Normally it is the user's
        // responsibility, but it may spare us some hard-to-debug
        // reports.
        const float* x = reinterpret_cast<const float*>(x_in);
        for (size_t i = 0; i < nx * d; i++) {
            FAISS_THROW_IF_NOT_MSG(
                    std::isfinite(x[i]), "input contains NaN's or Inf's");
        }
    }

Can you give users a flag to avoid this check ?
We already have a level above faiss which parse json docs to build vectors and check for all possible NaN/nil cases.

[mdouze]

Marking as enhancement, but I don't think there is a significant win in terms of runtime, so low-priority for us.