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+## Eigen CI infrastructure
+
+Eigen's CI infrastructure uses three stages:
+  1. A `checkformat` stage to verify MRs satisfy proper formatting style, as
+     defined by `clang-format`.
+  2. A `build` stage to build the unit-tests.
+  3. A `test` stage to run the unit-tests.
+
+For merge requests, only a small subset of tests are built/run, and only on a
+small subset of platforms.  This is to reduce our overall testing infrastructure
+resource usage.  In addition, we have nightly jobs that build and run the full
+suite of tests on most officially supported platforms.