Function faiss_sys::faiss_Index_train

pub unsafe extern "C" fn faiss_Index_train(
    index: *mut FaissIndex, 
    n: idx_t, 
    x: *const f32
) -> c_int

Perform training on a representative set of vectors

@param index opaque pointer to index object @param n nb of training vectors @param x training vecors, size n * d