Eigen 3.1.4/3.0.7 发布了，这两个都是维护版本，修复了一些 bug。
其中 3.0.7：
3.1.4：
- Bug 620: Fix robustness and performance issues in JacobiSVD::solve.
- Bug 613: Fix accuracy of SSE sqrt for very small numbers.
- Bug 608: Fix sign computation in LDLT.
- Fix write access to CwiseUnaryView expressions.
- Fix compilation of transposeInPlace() for Array expressions.
- Fix non const data() member in Array and Matrix wrappers.
- Fix a few warnings and compilation issues with recent compiler versions.
- Documentation fixes.
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