Python with ILP64 openBLAS

How does one build pytorch with int64_t indexing version of openBLAS to support LAPACK operations on inputs of sizes > 2^32


Once you have your OpenBLAS with int64_t indexing built, you can either put it in a known OpenBLAS install folder like /opt/OpenBLAS/lib or specify its path in LD_LIBRARY_PATH. Then you can run script with BLAS=OpenBLAS to ensure that it uses OpenBLAS and not another BLAS library.

How do one built openBLAS with int64_t support ?

I don’t know :confused: But I’m sure you can find instructions in their repo or online.