drake
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#define EIGEN_USE_BLAS
We should enable this for all of Drake if we can confirm with the Eigen developers that it is ABI compatible (will not cause ODR violations).
This was initially PR'd in #16683 with a local change to multilayer_perceptron.cc, but after discussing with @jwnimmer-tri we've decided to pull it out of that PR and either enable it for all of Drake or decide that we will not enable it.