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e3b7f59659
Time-dependence prevents tests from being repeatable. This has long been an issue with debugging the tensor tests. Removing this will allow future tests to be repeatable in the usual way. Also, the recently added macros in !476 are causing headaches across different platforms. For example, checking `_XOPEN_SOURCE` is leading to multiple ambiguous macro errors across Google, and `_DEFAULT_SOURCE`/`_SVID_SOURCE`/`_BSD_SOURCE` are sometimes defined with values, sometimes defined as empty, and sometimes not defined at all when they probably should be. This is leading to multiple build breakages. The simplest approach is to generate a seed via `Eigen::internal::random<uint64_t>()` if on CPU. For GPU, we use a hash based on the current thread ID (since `rand()` isn't supported on GPU). Fixes #1602.
Eigen is a C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms.
For more information go to http://eigen.tuxfamily.org/.
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